JP4182465B2 - X-ray CT system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention , The present invention relates to a computer tomographic (CT) apparatus that records medical images on any portable recording medium and can efficiently organize the recording media.
[0002]
[Prior art]
Today, medical image diagnostic devices that can capture the inside of a subject as an image and can perform medical diagnosis based on this image are in widespread use in hospitals of a considerable scale and are no longer routine diagnostics. Has become part of the business. As such a medical image diagnostic apparatus, for example, X-rays are imaged by irradiating a subject with X-rays and absorbing the X-rays into an organ, bone, or the like in the subject. An imaging apparatus, an X-ray CT apparatus that acquires a tomographic image of a subject by collecting and reconstructing projection data obtained as a result of irradiating X-rays from multiple directions on the subject using the same principle Proposed.
[0003]
Medical images acquired by such various devices may be recorded on other portable recording media such as MO (Magnetic Optical Disc) for the purpose of long-term storage and reproduction in other hospitals. Has been done.
[0004]
Recently, with the advent of multi-slice CT, when it becomes possible to reconstruct images of various conditions from raw data, the usefulness of the raw data increases, and the raw data is separated from the image data after image reconstruction. There is an increasing opportunity to store the data in a predetermined recording medium such as a backup medium such as an MO. Here, the raw data (raw data) refers to data for performing pre-processing (correction processing) necessary for the collected projection data to perform image reconstruction.
[0005]
In this way, raw data that may need to be used later is recorded in an MO or the like as necessary, and when it is desired to reconstruct later, the raw data stored in the recording medium is stored. By calling the data, the reconstruction condition can be changed (for example, reconstruction function change, reconstruction pitch change, zoom, etc.), and a newly reconstructed image can be obtained.
[0006]
[Problems to be solved by the invention]
By the way, in the X-ray CT apparatus, since the reconstructed image data is generally composed of an image file of 512 × 512 pixels, the size is about 512 KB per sheet, but the raw data is The size varies depending on the performance or type (single slice or multi-slice) and the scanning conditions used (scanning time, etc.). For example, the raw data for a single rotation of conventional scanning is approximately 2 MB (for 4 images), 30 rotations continuous. The raw scan data is approximately 60 MB (120 images), which is 30 times larger than that, and the 4-slice multi-slice CT is 240 MB (480 images), which is 4 times larger than that. Amount) is large.
[0007]
For this reason, for example, recording of raw data on the above-described MO usually requires a considerable amount of time for storing the data in one MO and completing the writing process.
[0008]
Furthermore, the raw data by continuous scanning such as helical scanning and dynamic scanning can be saved as only one file because it is configured as one data regardless of how long the scan time is. Even when only a part of the raw data is desired, it was necessary to save all of the raw data. For this reason, the time required for storage increases, and the capacity of the medium to be stored becomes enormous, which inevitably increases the storage capacity and increases the number of media used.
[0009]
In particular, when raw data is stored in a plurality of MOs, after the first recording operation, the same recording operation for the next MO must be performed again 30 minutes later. The operator is restricted by the work for a long time.
[0010]
From the viewpoint of increasing the capacity, it is conceivable to use a DVD or the like as a recording medium. However, although the capacity problem is reduced with a DVD, there is a problem that it takes time to save data such as writing when the size of a file to be saved is large.
[0011]
Furthermore, in a multi-slice X-ray CT apparatus, the amount of data is larger than that of an X-ray CT apparatus such as a single slice, and for example, there are cases in which only a quantity for several examinations is included in one MO. In the future, if the performance is further improved, it is possible that even one MO cannot record data for one inspection.
[0012]
Furthermore, in the medical image diagnostic apparatus, a 3D image is also generated. When this 3D image is generated, reconstruction is performed with a thin slice pitch (thin image slice thickness), for example, about 1000 projection data. The number of reconfigurations is increasing. In such a case, when converted to the image data capacity, the capacity is about 500 Mbytes. For example, if the capacity is 60 Mbytes with 30 rotations, the raw data becomes smaller up to about 240 rotations (120 seconds).
[0013]
Thus, if the pitch thickness is reduced and the number of slice columns is increased in the future, the capacity of the raw data before reconstruction is smaller than the capacity of the image data after reconstruction, and the image data as described above. Although only image processing can be performed, raw data can be reconstructed under any conditions, and there is an increasing demand for saving raw data. However, due to the circumstances described above, a large amount of raw data is collected. In such a case, the conventional method cannot handle the raw data, and it is necessary to take some measures.
[0014]
The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the user of the apparatus from being restrained for a long time by recording work of raw data on a recording medium, and is necessary. To obtain only the information of the correct part X-ray CT system Is to provide.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, raw data is collected by scanning the subject by exposing the subject to X-rays from multiple directions. Image reconstruction based on X-ray CT A device, Using a display unit that displays a reference image that has been subjected to image processing based on the raw data, and a reference image that is displayed on the display unit, A range designating unit for designating a necessary clipping range from all the collected row data, and extracting the raw data of the clipping range designated by the range designating unit from the collected all row data. The image processing apparatus includes an extraction unit, and a storage unit that writes the raw data extracted by the extraction unit to a recording medium by an operation of a storage setting by an operator and stores the raw data.
[0017]
Claims 2 The reference image includes the reference image including image reconstructed image data, and the range designating unit designates the cutout range with reference to the image data.
[0018]
Claims 3 The reference image includes the real-time (play and reverse) reconstructed image of the subject, and the range designating unit refers to the real-time (play and reverse) reconstructed image and extracts the cut-out range. It is characterized by specifying.
[0019]
Claims 4 The reference image includes the reference image including a scanogram of the subject, and the range designating unit designates a cutout range with reference to the scanogram.
[0020]
Claims 5 The range specifying means specifies the necessary cut-out range of all the collected raw data based on condition information that defines conditions for scanning the subject. Yes.
[0021]
Claims 6 The condition information includes scan time information for scanning the subject, and the range designating unit designates the extraction range based on the scan time information.
[0022]
Claims 7 In the invention described in the item 1, the condition information is obtained by continuously rotating an X-ray source for exposing the X-rays around the subject and moving the subject in a body axis direction to helically move the subject. Helical mileage information at the time of scanning is included, and the range designating unit designates the cutout range based on the helical mileage information.
[0023]
Claims 8 In the invention described in the item 1, the condition information includes: rotating the X-ray source for exposing the X-ray continuously around the subject and moving the subject in the body axis direction. It includes bed position information of a bed to be placed, and the range specifying means specifies the cut-out range based on the bed position information.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of a preferred embodiment of the present invention will be specifically described with reference to the drawings.
[0029]
[First Embodiment]
(Overall configuration of the device)
A feature of the present invention is that a necessary cutout range can be specified for raw data (raw data) collected in an X-ray CT apparatus, and the raw data cut out in the cutout range can be stored in a recording medium. It is to have done. Prior to specific description of such a characteristic configuration, an overall schematic configuration of an X-ray CT apparatus which is an example of a medical image diagnostic apparatus will be described with reference to FIG. FIG. 1 is a schematic diagram showing an example of the X-ray CT apparatus of the present embodiment.
[0030]
The X-ray CT apparatus 1 according to the present embodiment includes a gantry 11 and a console 21 as shown in FIG. The gantry 11 is provided with a cavity portion 11a, and the subject P placed on the couch top is introduced into the cavity portion 11a. Around the cavity 11a, an X-ray tube 12 and an X-ray detector 13 are arranged opposite to each other, and both can rotate around the subject P as indicated by an arrow A in the figure. The X-ray tube 12 is connected to an X-ray generator 14 including a high voltage power source and the like, and the X-ray detector 13 includes pixel electrodes (not shown) including, for example, photoelectric conversion elements arranged in a two-dimensional manner. It is mainly configured and connected to a data collection unit 22 described later.
[0031]
The X-rays emitted from the X-ray tube 12 are exposed to the subject P, and the X-rays transmitted through the subject P are converted into electric signals by the pixel electrodes of the X-ray detector 13 to obtain data. It is transmitted to the collection unit 22. The data collection unit 22 collects and outputs projection data of a plurality of slices of the subject for each rotation of the X-ray tube 12 based on the data collection control signal.
[0032]
The console 21 performs an appropriate calibration process such as sensitivity correction and X-ray intensity correction on the digital signal transmitted from the data collection unit 22, and uses this as raw “projection data” (raw data: raw data). ), A storage device 24 that stores the raw data processed by the preprocessing unit, and a reconstruction unit 25 that reconstructs a tomographic image based on the projection data stored in the storage device 24. A storage device 26 for storing the image data reconstructed by the reconstruction unit 25, a data processing unit 27 for performing various data processing such as a three-dimensional image based on the reconstructed image data, the gantry 11 and A central control unit 28 for controlling operations such as transmission of raw data (low data) to the bed / top plate and the external recording device 40 described in detail later, and a device user accesses the central control unit 28. Operation unit 31 of the order, and an image display unit 32, MO external recording device capable of recording on a recording medium such as 40 to display a tomographic image of the reconstructed object (axial image), or the like. Of these, specifically, a pointing device such as a mouse, a keyboard, or a trackball can be used as the operation unit 31, and a CRT or the like can be used as the image display unit 32. The image display unit 32 corresponds to “display means” according to the present invention.
[0033]
The user of the apparatus issues a command to the central control unit 28 via the operation unit 31, and the central control unit 28 receives this and regenerates the tomographic image based on the X-ray information detected by the X-ray detector 13. The image is displayed on the image display unit 32. By designating any one of a plurality of tomographic images displayed on the image display unit 32, it is possible to cut out raw projection data.
[0034]
More specifically, in order to reconstruct the tomographic image in the X-ray CT apparatus 1 having the above-described configuration, first, the X-ray tube 12 and the X-ray detector 13 continuously rotate around the subject P. At the same time, the bed is moved in the slice direction at a predetermined speed, and the subject P is helically scanned in the slice direction. At this time, when the X-rays emitted from the X-ray tube 12 are exposed to and transmitted through the subject P, the transmitted X-rays are caused by the presence / absence of an organ or the like in the subject P. The amount of absorption occurs depending on the site of transmission, and the X-ray detector 13 detects and acquires X-ray information in which such an intensity distribution exists, that is, X-ray information including information inside the subject P. . The X-ray information is acquired in multiple directions with respect to the slice width by the rotation around the subject P by the X-ray tube 12 and the X-ray detector 13, and these are electrically transmitted to the pixel electrodes in the X-ray detector 13. After being converted into information, the electrical information is transmitted to the data collection unit 22.
[0035]
FIG. 4 shows a state in which the subject P is helically scanned in the imaging region from the scan start position to the scan end position. As can be seen from FIG. 4, in the imaging region from the scan start position to the scan end position, for example, four slices of projection data are collected every time the X-ray tube 12 makes one rotation, and a similar data collection process is performed. Repeated until the N / Mth rotation. In this case, the data collection unit 22 collects projection data of a plurality of slices of the subject from the four rows of X-ray detectors 13 for each rotation of the X-ray tube 12.
[0036]
The data collection unit 22 receives the electrical signal from the X-ray detector 13. Note that the detection operation by the X-ray detector 13 is repeated, for example, about 1000 times during one rotation, so that enormous two-dimensional projection data corresponding to 4 slices × the number of detector channels per second (one rotation). It is intended to be able to process such an enormous and high-speed 2D projection data generated 1000 times at an extremely high speed.
[0037]
In the data collection unit 22, the X-ray information as an electric signal is amplified by an amplifier and then converted into a digital signal by an A / D converter.
[0038]
Further, the data collection unit 22 receives “a part of the incidental information” regarding the subject P together with the electrical information. Here, “accompanying information” refers to data (time information) relating to the scan time at the time when the X-ray detector 13 detects the X-ray information that is the basis of the electrical information, and the bed on which the subject P is placed. Or data on the movement or position of the top board (bed position information).
[0039]
The electrical information received by the data collection unit 22 is then transmitted to the pre-processing unit 23 where the raw “projection data” is subjected to appropriate calibration processing such as sensitivity correction and X-ray intensity correction. (Hereinafter also referred to as raw data or raw data as required). This projection data is sequentially stored in the storage device 24 together with the accompanying information accompanying it.
[0040]
At this time, the stored projection data is accompanied by the supplementary information at the time when the X-ray information that is the basis of the projection data is collected by the X-ray detector 13. Therefore, the storage device 24 stores the incidental information corresponding to the projection data.
[0041]
After that, if all of the projection data scheduled to be acquired at the beginning are collected, the data collection process is terminated, and if not collected, the data collection by the X-ray tube 12 and the X-ray detector 13 is further continued.
[0042]
Then, each 2 slices of a plurality of slices of the subject that are collected for each rotation of the X-ray tube 12 within the imaging region from the start of the scan to the end of the scan and subjected to sensitivity correction, X-ray intensity correction, etc. The two-dimensional projection data is temporarily stored in the storage device 24, and then the two-dimensional projection data is sent to the reconstruction unit 25.
[0043]
The reconstruction unit 25 receives projection data from the storage device 24, and based on the projection data, for example, a three-dimensional image reconstruction algorithm typified by a method called fan beam reconstruction or the Feldkamp method is used. Reconfiguration for the specimen P is performed. This reconstruction is based on the three-dimensional distribution data of the X-ray absorption coefficient in a wide target area (volume) in the slice direction (hereinafter referred to as “volume data (a collection of a plurality of slice images three-dimensionally)”. It is summarized as). This volume data is typically reconstructed as a collection of multi-slice tomographic image data.
[0044]
Specifically, the reconstruction unit 25 extracts, from the projection data stored in the storage device 24, for example, projection data of the first rotation of the X-ray tube 12 and the first column of the detector row, and the projection Based on the data, the first tomographic image of the detector row is reconstructed at the first rotation, and similarly, the projection data of the X-ray tube 12 at the N / M rotation and the detector row at the Mth row is extracted. Based on the projection data, the detector row reconstructs the M-th tomographic image at the N / Mth rotation. The reconstructed image data (tomographic image) is stored in the storage device 26, and the reconstructed tomographic image is displayed on the image display unit 32.
[0045]
When reconstructing a tomographic image from projection data, for example, a tomographic image corresponding to each of the plurality of slice positions can be reconstructed based on projection data relating to each of the slice positions, It is also possible to treat a plurality of (or adjacent) slice positions as “one” projection data and reconstruct a tomographic image based on the projection data. The storage devices 24 and 26 store data (image data) relating to the tomographic image reconstructed as described above, the projection data, and the like according to circumstances. As a specific configuration thereof, for example, a known hard disk may be employed.
[0046]
In addition, information on the position of the bed or the top board that changes due to the action of the power source (imaging position information) is collected simultaneously with the collection of the X-ray data. For example, the management information related to the image reconstructed by the reconstruction unit 25 includes the shooting position information collected at this time. That is, image position information unique to the image displayed on the image display unit 32 or image data stored in the storage devices 24 and 26 is always attached as attribute information.
[0047]
The reconstructed volume data is directly or once stored in the storage device 26, and then sent to the data processing unit 27, and is already widely used based on the instructions of the device user. The image is converted into so-called pseudo three-dimensional image data such as a projected image from an arbitrary direction or a three-dimensional surface image of a specific organ by rendering processing, and is displayed on the image display unit 32.
[0048]
The device user can select and set an arbitrary display form from the tomographic image of the arbitrary cross section, the projected image from the arbitrary direction, the three-dimensional surface image, etc. according to the purpose of the inspection / diagnosis. is there. In this case, an image in a different form is generated from one volume data and displayed. In addition, when displaying, not only one type of image, but also a mode in which a plurality of types of images are displayed at the same time can be switched to a mode in which one image is displayed according to the purpose. Yes.
[0049]
Incidentally, the above-mentioned “tomographic image of arbitrary cross section” means not only a cross section (axial cross section) AX orthogonal to the body axis obtained by a conventional X-ray CT apparatus, but also an axial cross section such as a sagittal cross section SA and a coronal cross section CO. It refers to a tomographic image of a cross section orthogonal to AX, and further an oblique cross section OB inclined with respect to these cross sections AX, SA, and CO. These extract the cross-sectional image data of the specified thickness from the volume data, and display them in a bundle.
[0050]
The “projection image from an arbitrary direction” means that, for the volume data, for example, a maximum value is picked up for the sectional image data arranged in the direction set as the arbitrary direction, and the arranged sectional image data This is displayed as a two-dimensional image, for example, by taking the integrated value. Furthermore, the “three-dimensional surface image” is, for example, a method of extracting a surface with a set threshold value and displaying the surface in a three-dimensional manner by shading with a set light source. In this case, the internal structure can be grasped by observing while changing the threshold value. In such an X-ray CT apparatus, various images can be acquired through one volume data.
[0051]
According to the one-rotation scan, by performing the above data processing, as described above, one volume data is obtained in the slice direction from the two-dimensional projection data from multiple directions obtained by only one rotation. be able to. In addition to the axial cross section AX, it is possible to observe a tomographic image at a certain time (same time). As described above, the form of the display image in this case can be selected and set from a tomographic image having an arbitrary cross section, a projection image in an arbitrary direction, a three-dimensional surface image, and the like.
[0052]
Also, according to the continuous rotation scan, when the same processing as in the case of one rotation is repeated for two-dimensional projection data from multiple directions obtained by a plurality of rotations, one volume data is obtained. Rather than multiple. Even when reconfiguration is performed for each rotation, the same number of sets as the number of rotations can be obtained, and the range of data used for reconstruction (range of the rotation angle of the system) is gradually shifted, so that More volume data that is slightly different can be obtained. Regarding the form of the display image in the case of this continuous rotation scan, as in the case of one rotation, according to the setting of the apparatus user, a tomographic image of an arbitrary cross section, a projection image from an arbitrary direction, a three-dimensional surface image, etc. It is possible to select from.
[0053]
Here, the X-ray CT apparatus 1 according to the present embodiment has the following configuration or function regarding the tomographic image reconstruction and display thereof.
[0054]
The X-ray tube 12 and the X-ray detector 13 are electrically connected via a slip ring (not shown), whereby the X-ray tube 12 and the X-ray detector 13 are connected to the subject P. The multi-directional X-ray information related to the subject P required for reconstruction of one tomographic image can be continuously collected while continuously rotating around (hereinafter referred to as such an X-ray CT apparatus 1). A mode related to the operation or operation of the system is referred to as “perspective mode”).
[0055]
According to the operation of the X-ray CT apparatus 1 in such a “transparent mode”, for example, the projection data at the same slice position or slice width is continuously acquired, and the tomographic image is continuously displayed on the image display unit 32. It becomes possible to do. According to the continuous display of the tomographic image, for example, the change of the tomographic image due to the inflow or outflow of the contrast agent administered to the subject P can be traced every moment. Such a method is also referred to as “dynamic scanning”, for example.
[0056]
As another example, the top position is moved in synchronization with the continuous rotation of the X-ray tube 12 and the X-ray detector 13 to change the slice position related to the subject P in a spiral manner. It is also possible to obtain projection data and obtain a tomographic image of the subject P over a wide range (in the body axis direction). Such a method is also referred to as “helical scan”, for example.
[0057]
Furthermore, the X-ray CT apparatus 1 according to the present embodiment has a function capable of defining a plurality of the slice positions only by the X-ray tube 12 and the X-ray detector 13 rotating once around the subject P. Yes (multi-slice function). This defines the “slice width” of the X-rays emitted from the X-ray tube 12 with respect to the subject P so as to have a predetermined interval, and detects the X-rays having the pixel electrodes arranged two-dimensionally. This is realized by detecting with the device 13. Incidentally, in order to set the slice width to a predetermined interval, for example, a collimator (not shown) can be provided on the X-ray tube 12.
[0058]
According to this, it becomes possible to acquire tomographic images relating to a plurality of locations of the subject P at a specific time at once. In the present embodiment, a plurality of tomographic images obtained in this way can be displayed in parallel (multi-frame display) on the image display unit 32. That is, the image display unit 32 can be divided into predetermined frames so as to correspond to the number of tomographic images acquired, and one of the plurality of tomographic images can be displayed for each of these frames. In this way, a plurality of tomographic images at a specific time can be confirmed at a time on the image display unit 32.
[0059]
Furthermore, in the present embodiment, while continuously rotating the X-ray tube 12 and the X-ray detector 13 described above (while performing the “perspective mode” operation), the tomographic image reconstruction by the multi-slice processing just described and It is also possible to carry out the display. In this case, for example, if the tomographic image reconstruction is performed by the “dynamic scan” with respect to a predetermined slice width, each of the plurality of tomographic images on the image display unit 32 changes in a “cinematic image” manner. Will be displayed.
[0060]
In the situation where “projection data” is being acquired and stored as described above, the reconstruction and display of the tomographic image that changes every moment in the above-described “perspective mode” are performed, for example, as follows. In other words, during the continuous rotation of the X-ray tube 12 and the X-ray detector 13, the projection data necessary for reconstructing at least one tomographic image is stored in the storage device 24. Each time it is sequentially stored in the device 24, it is sent to the reconstruction unit 25 (or read from the storage device 24). As a result, real-time tomographic reconstruction and display (confirmation) of the subject P can be performed after a certain period of time has elapsed since the X-ray detector 13 acquired the X-ray information.
[0061]
On the other hand, the external recording device 40 is a raw data file of raw data (projection data) stored in the storage device 24 of the X-ray CT apparatus 1, and raw data sent from the central control unit 28 via an interface. The contents are recorded on the basis of the above. In this case, the recording with respect to the MO is, as is well known, for example, forming a bit array based on the digital value array constituting the raw data on the disk surface of the recording film magnetized in advance. Applicable.
[0062]
When the raw data is recorded in the MO, in order to make it possible to recognize what the subject P (who) is related to, or to make it distinguishable from other raw data, the name of the subject P, etc. Information (identification information) is recorded. In this embodiment, the identification information is automatically extracted from the raw data sent from the storage device 24 or the like.
[0063]
(Characteristic configuration of the present embodiment)
Here, the features of the present embodiment, that is, an outline and a specific configuration when a cutout range is specified for raw data (raw data) and cut out will be described with reference to FIGS. FIG. 2 is an explanatory diagram for explaining the outline of the present embodiment.
[0064]
In the present embodiment, as shown in FIG. 2, only a predetermined necessary portion of the raw data 24a acquired by the X-ray CT apparatus is selected and specified as a cutout range, and the specified cutout range is used. The raw data 24a is cut out, and the cut out raw data 24c after cut out can be stored in a predetermined recording medium such as MO.
[0065]
When specifying the cutout range of the raw data 24a, the cutout range is specified using the image data 24g obtained by reconstructing the raw data 24a. At this time, a plurality of pieces of image data are displayed in a thumbnail format as a “cutout range designation” UI (user interface) 33c displayed on the image display unit 32 when a predetermined cutout range is designated in the image data 24g. Then, image data in a predetermined cutout range is selected by drag and drop or the like.
[0066]
For this reason, in order to correctly calculate the scan time and the couch position information when generating the cut out raw data 24c from the raw data 24a by specifying the cutout range of the image data 24g, additional information (slices) of the image data is calculated. The position information of the raw data corresponding to the image data in the cut-out range is calculated based on the raw data-image data correspondence information 24f that defines the relationship with the incidental information (bed position) of the raw data corresponding to the number), The calculation result of the incidental information such as the bed position information is written as incidental information of the cut-out raw data 24c.
[0067]
In this way, by forming the raw data 24c after being cut out, it becomes possible to store only the necessary raw data.
[0068]
Next, a specific configuration for achieving the above functions will be described with reference to FIG.
[0069]
In the storage device 24, the raw data 24a acquired by the data collection unit 22, the incidental information 24b related to the acquired raw data, the raw data 24c cut out by the cut-out, and the correction corresponding to the cut-out raw data Information 24d, cutout range designation information 24e relating to the designated cutout range, raw data image data defining a correspondence relationship between raw data corresponding to a certain slice number and image data reconstructed based on this raw data The correspondence information 24f is included.
[0070]
The file format of the raw data 24a and 24c is defined as a storage format according to a format based on a predetermined standard.
[0071]
The incidental information 24b and 24d is information accompanying the raw data 24a and 24c, and is configured by a dedicated file.
[0072]
As the incidental information 24b (condition information), for example, scan conditions, that is, time information (such as scan start time and scan end time), bed position information, rotation speed of the X-ray tube and the X-ray detector (0.5 Second or 0.8 second), slice thickness at the time of collection, X-ray conditions, and the like.
[0073]
The bed position information is a bed position when the bed moves while the X-ray tube 12 and the X-ray detector 13 are continuously rotating. Since the couch position information is usually owned by the raw data itself, it is not necessary to recalculate the couch position after the cutout. Note that the couch position information is also used when performing interpolation calculation at the time of reconstruction.
[0074]
In addition, the incidental information 24b and the raw data 24a are integrally formed as shown in a data structure to be described later, but for convenience of explanation, they are shown separately for convenience. That is, on the device user side, the raw data and the incidental information cannot be seen separately, but in the internal structure, the raw data and the incidental information are stored separately. Raw data is stored in one area of the recording medium M, and incidental information is stored in the other area. When a device user (for example, an engineer) specifies that raw data is to be saved, the raw data and incidental information are saved together in the storage device.
[0075]
Here, the data structure of the raw data 24a and the incidental information 24b is, for example, as shown in FIG. 5, when there is a series of raw data D1 to DN, the first D1 of the raw data is scanned as the incidental information D11. It contains time information (scan start time), information about the position of the bed (bed position information), and the last DN of the raw data contains scan time information at the scan end time, bed position information, etc. as supplementary information D1N Yes.
[0076]
For example, if 13:01:30 is the scan start time, time information of 13: 1: 30 is stored in the incidental information D11. Thereafter, for example, data is entered every rotation, and two rotations are performed, for example. If it is performed in 0.5 seconds, the time information of 13:01:31 is stored in the incidental information D1M at the second rotation.
[0077]
Here, if the range of the corresponding portion of the raw data corresponding to the cutout range specified by the image data is Dk to Di, a group of data Dk to Di is formed as the raw data 24c, and at the same time as the cutout The incidental information Dk1 to Di1 are formed as incidental information 24d.
[0078]
As described above, in the data structure of the present embodiment, data corresponding to the number of channels is assigned according to the corresponding time (scan time) in the data based on the scan start time and the scan end time. That is, in the data structure of the raw data of the X-ray CT apparatus of the present embodiment, data D11 to DN1 referred to as extra data is attached to the head, and the bed position information is stored in the corresponding location. Information on the bed position can be obtained by reading the data of the head portion of the cut out portion.
[0079]
Since data collection is performed in units of the number of rotations, even if the necessary image cut out from the middle is, for example, 10.3 rotations, it is processed as 11 rotations when stored.
[0080]
Returning to FIG. 3, the central control unit 28 corresponds to the raw data cut-out processing unit 28 a that cuts out raw data selected in a specific range from the obtained raw data. Ancillary information calculation means 28b for performing processing to add incidental information 24d corresponding to the extracted raw data by performing predetermined arithmetic processing on the incidental information 24b, the extracted raw data and the modified (calculated) incidental File generation means 28c for generating a file as a raw data file under the information, transfer processing means 28d for performing processing to transfer the generated file to a predetermined external recording device 40, and the transferred file to the external recording device 40 Write processing means 28c for performing a process of instructing to write to the recording medium M.
[0081]
Further, when the obtained raw data is for each of a plurality of subjects, for example, the raw data file selection means 33a for selecting one or more specific raw data files, and the specific raw data Cutout range designation means 33b for designating a cutout range of a predetermined portion (area) for data is formed. The raw data file selection unit 33a, the cutout range designation unit 33b, and the like are preferably displayed on the image display unit 33 or the like using a predetermined UI.
[0082]
It should be noted that the “range specification means” according to the present invention can be configured by the cutout range specification means 33b of the present embodiment, and the “extraction means” according to the present invention can be configured by the raw data cutout processing means 28a, the file generation means 28c, etc. Further, the “storage means” according to the present invention can be constituted by the transfer processing means 28d, the writing processing means 28e, and the like. Furthermore, the incidental information calculation means 28b corresponds to the “calculation means” in the present invention.
[0083]
At this time, the range designating unit designates a necessary cut-out range from the collected whole raw data (raw data), and the extraction unit uses the collected whole raw data to obtain the raw data in the designated cut-out range. The storage means stores the cut-out raw data by performing a writing process on the recording medium. In addition, the calculation means changes the condition information (for example, incidental information) corresponding to the whole raw data defining the conditions for scanning the subject into the condition information corresponding to the cut-out range of the cut-out raw data. Perform the operation.
[0084]
Here, the image file constituting the tomographic image displayed on the image display unit 33 is described in the supplementary information AT described in the header portion of the file and the main part of the image file, as shown in FIG. For example, information such as a slice number and a slice thickness is written as the auxiliary information AT.
[0085]
Note that the image data reconstructed from the raw data is not shown in the storage device 24, but with the accompanying information AT, the examination number of the selected tomogram, the slice number of the tomogram currently displayed, The number of examination images including the selected tomographic image is stored.
[0086]
Based on the examination number of the selected tomographic image (image data) and the slice number of the currently displayed tomographic image, the central control unit 28 reads the incidental information AT in the header portion of the tomographic image existing in the storage device 24. The tomographic image corresponding to the examination number and the slice number is displayed on the image display unit 32. Further, the header portion of the tomographic image (image data) existing in the storage device 24 is read to determine the number of images of the selected examination, and the patient name, examination number, number of tomographic images, and examination date are displayed in the image display section 32. indicate.
[0087]
The central control unit 28 selects the slice thickness of the selected tomographic image, the number of images of the selected examination, the maximum slice number of the tomographic image, the examination number of the selected tomographic image, and the slice number of the currently displayed tomographic image. Memorize etc. Further, the number of images of the selected examination and the slice thickness are output to the storage device 24.
[0088]
In the control system for cutting out the raw data as described above, the raw data 24a of the acquired subject or each raw data corresponding to each subject is stored in the storage device 24 in advance. Therefore, first, when there are a plurality of raw data according to each subject, the apparatus user uses the raw data file selection means 33a to select any one of these raw data that is desired to be cut out. Raw data is selected on the UI. The selected raw data is stored in a predetermined buffer.
[0089]
Next, the tomographic image (image data) displayed on the image data display means 33c by the cutout range designating unit 33b displays the cutout range (for example, the 11th to 70th pieces) of the portion desired to be cut out from the raw data. Is specified and is stored in a predetermined area of the recording device 24 as cutout range specification information 24e. Then, the raw data cutout processing unit 28a extracts the raw data portion from the first portion designated to the last portion designated for the obtained raw data 24a based on the cutout range designation information 24e. The cut raw data 24c is formed. On the other hand, the incidental information calculation means 28b performs an operation of correcting the incidental information 24b such as the scan time so as to correspond to the extracted raw data 24c, thereby forming the incidental information 24d.
[0090]
Here, when the raw data 24a is cut out and saved, the scan time and the bed position information are changed as incidental information corresponding to the cut out raw data according to the cut-out position, and various other types are performed. The change process is not performed on the information.
[0091]
In this way, the cut out raw data 24c and the modified incidental information 24d are generated and stored in a predetermined area of the storage device 24.
[0092]
Then, the file generation means 28c generates a raw data file by using the raw data 24c and the accompanying information 24d. The generated raw data file is transferred from the storage device 24 to the external recording device 40 (FIG. 1) by the transfer processing unit 28d, and the writing processing unit 28e instructs the external recording device 50 to perform writing.
[0093]
In this way, when saving raw data, the reconstruction process is usually completed, so when cutting out, a certain range is specified while referring to the reconstructed image data (tomographic image). When this is done, only that portion is selectively cut out and saved. In addition, the process which changes incidental information, such as scanning time and bed position information, according to the cut-out part is performed.
[0094]
Here, before the raw data is designated to be stored in the recording medium M such as the MO, the raw data 24a is initially drawn in and stored in the storage device 24 which is an internal disk. That is, the raw data 24a is temporarily stored in the storage device 24 (disk) after the preprocessing is completed, read out from the storage device 24, subjected to reconstruction processing, and the reconstructed image is stored in the storage device 26 ( To disk.
[0095]
The reconstructed image data and raw data may be stored in different storage areas on the same disk, or may be stored on different disks.
[0096]
Then, a range to be cut out is designated using a series of reconstructed image data. For example, when creating an image by reconstructing raw data, assuming that 100 images have been reconstructed, if this image is viewed and saved from 11 to 70, this raw data Among them, only the part necessary for reconstructing the images from the 11th sheet to the 70th sheet is extracted and stored from the workstation.
[0097]
In this case, there are 100 image data, and the data including the affected area from the 11th image to the 70th image, and when the data from the 1st to 10th image and the 71st to 100th image are not required, The capacity of data required for the reconstruction from the 11th sheet to the 70th sheet is reduced to about 60%. Of course, of the incidental information (collection conditions) attached to the raw data, the bed position information and the scan time information are rewritten according to the cutout range.
[0098]
That is, when the cutout is performed, it is necessary to rewrite the start time and the end time of the scan time. For example, if the number is 11 to 70, only the central region in the slice direction is used, and therefore processing for changing the scan time (scan start time, scan end time) corresponding to the region is performed. Such a calculation necessary for automatically updating the supplementary information is performed, and the supplementary information is rewritten.
[0099]
As described above, in the present embodiment, when saving, only the raw data of the designated cutout portion is saved. At this time, incidental information such as bed position information and scan time is stored together with the raw data in another area of the external recording device 40.
[0100]
As a result, the storage time is short and the number of media used is reduced. For this reason, it is particularly useful in a multi-slice X-ray CT apparatus with an increased opportunity for storing raw data.
[0101]
(About the display screen)
Next, a method for specifying a cut-out range when cutting out raw data will be described. For example, after one inspection is completed, a menu screen “save raw data” is generated, and a directory list displaying each raw data file is displayed on the menu screen. When a raw data file is specified, the raw data is stored.
[0102]
At that time, at the stage of specifying the raw data file, for example, a specification screen 120 for specifying the cutout as shown in FIG. 8 is displayed together with a message such as “cut out using an image”.
[0103]
On the designation screen 120, for example, the images File1 to Filen of the data are displayed in a thumbnail format. Then, when a selector for selecting each image displayed in the thumbnail format is displayed, and an image corresponding to the cut start position and the image corresponding to the cut end position of each arranged data are respectively designated. The raw data cutout range can be specified. In this way, by performing the storing operation after designating the range, it is possible to store the raw data necessary for reconstructing the desired cutout range.
[0104]
An example of the display mode of the display screen is not limited to the thumbnail format as described above. For example, the display screen may be displayed in a directory file view format as shown in FIG.
[0105]
In this case, for example, the display screen 120 displays a list of folders or similar directory trees 101 for each subject in a directory format. For example, a plurality of pieces of image data 102 for one raw data folder are displayed. Is displayed in file format.
[0106]
Then, the device user designates a cutout range by designating a range from an image file at one place to an image file from another place among a plurality of image files of the image data. be able to.
[0107]
Here, it is assumed that file names are assigned to the image data files, and these are displayed in a list format.
[0108]
For example, in a four-row multi-slice X-ray CT apparatus, the capacity of raw data is such that each raw data for about four examinations can be written to one MO. For this reason, if the amount of raw data collected is larger than the amount of MO, and if the amount of raw data selected and cut out is still larger than the amount of MO, it can be stored only halfway. Can not. In that case, for example, a display such as “cannot be saved” is displayed.
[0109]
Further, in this type of X-ray CT apparatus capable of helical scanning, in order to reconstruct an image of the slice, the data before and after is generally used as an interpolation decnic.
[0110]
In other words, when only the selected part is cut out from the raw data collected by the helical scan, only the data part necessary for interpolation is automatically selected instead of cutting out only the selected part. It is saved in a reconfigurable state including the data.
[0111]
In this way, a necessary range can be partially cut out and acquired from raw data composed of one file.
[0112]
(About processing procedure)
Next, in the X-ray CT apparatus having the above-described configuration, a processing procedure in the case where raw data is cut out and stored will be described with reference to FIGS.
[0113]
First, as a premise that the processing related to “cutting out raw data” is performed, raw data is acquired, raw data is recorded in the storage device 24 together with incidental information, reconstruction is completed, and image data after reconstruction is also stored. It is assumed that it is recorded in the storage device 26 or 24 together with the accompanying information.
[0114]
At this time, as the image data, various types (image types) such as a simple tomographic image can be assumed. In addition, there are generally a plurality of image data, such as one image for each of the plurality of subjects P, or a plurality of images acquired for one subject P, and the like. It is assumed that a file name for identifying these is attached to each.
[0115]
Under such a premise, the X-ray CT apparatus shifts to an appropriately programmed “data recording mode” and attempts to perform recording on a recording medium in the external recording apparatus 40 from various data. A thing is selected (step, hereinafter “S” 101). That is, for example, when saving raw data, select “raw data (save)”, and when saving image data (after reconstruction), select “image data (save)”. Just choose.
[0116]
It should be noted that the calling of the “raw data cut and save” function described below is not limited to this method, and may be configured to be called from various other screen development layers. For example, it may be called when a “raw data” icon on the menu screen is clicked or when a list dedicated to raw data is displayed from the “patient directory”.
[0117]
Further, for example, a “SAVE” (or any operation unit intended to store raw data) button is displayed on the image display unit 32 configured as an X-ray CT apparatus, and the button is operated by the operation unit 31 such as a mouse. By clicking (transition to data recording mode) and clicking one of the lists of raw data files (= plural raw data) displayed along with this (selecting raw data files) It is good (all are not shown). For example, when the “SAVE” button is pressed, a “raw data extraction setting screen” screen is called. Here, pressing the “SAVE” button is synonymous with “recording raw data”. Therefore, when “recording” raw data in S102, the setting screen is called.
[0118]
Next, on the setting screen, the cutout range of raw data to be recorded in the external recording device (MO) is designated (cutout range: N = k to i among slice numbers 1 to N) (S103). Here, as an example of the setting screen, for example, the user interface shown in FIGS. 7 and 8 may be configured. That is, as described in the description of the “display screen” above, in the example of FIG. 8, the tomographic image desired by the user of the apparatus is dragged and dropped from the tomographic images displayed in the thumbnail format in the slice number order. The cutout range is set by selecting with. Alternatively, in the example of FIG. 7, a desired range is selected from each image file listed in descending order in slice number order.
[0119]
In this way, the cutout range is selected and set. Note that a plurality of cutout ranges can be set for the raw data related to one scan. Also, when setting the cutout range, if you select below the minimum range that can be reconstructed based on the cutout raw data, for example, “Reconstruction is not possible. Please set the cutout range again.” It is good to display messages such as.
[0120]
In addition, before or after this step S103, the selected raw data is stored in any disk or any recording medium (disk A, disk B, etc.) that can be recorded as an external recording device. An item for sequentially setting such items may be provided.
[0121]
As described above, these settings are performed through the display screen on the image display unit 32 in the X-ray CT apparatus.
[0122]
Next, information about each cutout range of each designated raw data is held as cutout range designation information in a predetermined storage area of the storage device 24 (S104). Then, based on the designated slice numbers k to i, corresponding raw data is extracted from the raw data acquired from the X-ray CT apparatus and stored in a predetermined area, and stored in another predetermined area ( S105). At the same time, additional information (scan time, etc.) calculation processing of the extracted raw data is also performed (S106).
[0123]
Next, a file relating to the specified raw data and incidental information is generated (S105). At this time, in the cut out raw data, the accompanying information (scanning time, bed position information, etc.) is naturally different from the raw data before cutting out. A new incidental information file is created by rewriting the incidental information calculated in the S106 calculation process.
[0124]
Furthermore, the process which transmits the raw data concerning designation | designated and incidental information (file) to an external recording device is performed (S106).
[0125]
Here, FIG. 6A shows an example of the configuration of the image file (image data file), and FIG. 5 shows an example of the configuration of the raw data. In FIG. 6A, the image file is composed of the above-described image data DT and incidental information AT. Here, the incidental information AT corresponds to, for example, the file name described above, and in the figure, it is indicated that it is added to the head. In addition, as the incidental information AT, information related to the name of the subject P can be included. In addition, any information that can ensure the identifiability of the image data as described above can be written as the auxiliary information AT basically. In short, the incidental information AT shown in FIG. 6 can be regarded as a collection of information that can be the identification information.
[0126]
On the other hand, the incidental information attached to the raw data shown in FIG. 5 is scan time information, bed position information, and the like. For the raw data after cutting, a dedicated file that is an accompanying information file is generated together with the raw data file. It's okay.
[0127]
Here, even if the user of the apparatus inputs the name of the subject P by the operation unit 31 and designates the raw data file related to the subject P to be recorded in the external recording device 40 (MO). Good. This designation may be performed for a plurality of subjects P or a plurality of raw data files at a time. In such a case, information for specifying the raw data file (for example, the name of the subject P) is, for example, the storage device 24 or the like until the MO issue regarding the designated raw data file is completed. Is temporarily stored.
[0128]
Then, according to the above designation, the corresponding raw data file stored in the storage device 24 is read out from the central control unit 28 of the X-ray CT apparatus, and the raw data file (including data existing in the file is included). .) Is transmitted to the external recording device 40.
[0129]
Thereafter, the external recording device 40 records the contents of the MO recording surface based on the transmitted raw data file. Note that the raw data file is recorded in the MO, when raw data files related to a plurality of subjects P are designated, as shown in step SS1, first the subject P designated first is recorded. This is performed for the raw data file (n = 1 in step SS1). Also, it is checked whether the MO that is the recording medium M is set and the writing process is possible (S109).
[0130]
Note that, on the recording medium M, for example, recording as conceptually shown in the file list FL of FIG. 6B, that is, it is composed of (generally a plurality of) raw data files and one management information file. It is preferable that correct recording is performed. Here, the “management information file” is composed of management data extracted according to a predetermined standard from the above-mentioned supplementary information in the raw data file.
[0131]
In addition, when a plurality of raw data files exist for one subject P, such a plurality of raw data files 01, 02,... Are recorded as shown in FIG. The management information file is composed of the management data relating to each of the plurality of raw data files 01, 02,. In addition, during recording of a plurality of raw data files, there may be a raw data file 03 that cannot be recorded due to restrictions on the storage capacity of the MO. In this case, for example, an error is notified. It is only necessary to display that an exchange to another MO is instructed.
[0132]
The identification information is automatically extracted or selected by the central control unit 28 from the incidental information in the raw data file recorded in the MO in the external recording device 40.
[0133]
Next, as in step S111, it is determined whether or not the storage capacity for one MO still exists, and if there is still room in the storage capacity, it is in steps S112 and S113. In addition, it is determined whether or not the recording for the raw data file related to the nth designated subject P is completed, and whether or not the recording for all the designated raw data files is completed. In these cases, if there is a raw data file that has not yet been recorded, the recording of the raw data file is continued in the remaining area of the MO that has been determined to have room. .
[0134]
On the other hand, when the recording of the designated raw data file is completed, a process of registering other items such as the subject name corresponding to the raw data recorded in the MO in the management file is performed (S114).
[0135]
Subsequently, as shown in step S115, whether or not the recording operation to the MO for all the raw data files related to the nth designated subject P is completed, that is, the nth designated subject P is set. In the case where there are a plurality of such raw data files, it is confirmed whether there is a raw data file that has not yet been recorded in the MO.
[0136]
Here, the case where it is determined that such a raw data file exists is a raw data file related to the same (= n-th) subject P, but is still recorded due to the limitation of the storage capacity of the MO. This is the case when there is no “raw data file 03”. It is to be noted that this fact is practically determined when the raw data file 03 is recorded in the MO following the previous raw data file 02 in step S115. When there is no capacity.
[0137]
Incidentally, such a case occurs when, for example, the already recorded raw data files 01 and 02 have a thin slice thickness and the amount of the raw data is enormous.
[0138]
In such a case, the process returns to step S110 again. That is, the recording of the unrecorded raw data file 03 related to the same subject P is continuously performed for another new MO.
[0139]
In this case, that is, when a plurality of MOs are issued for raw data files of the same subject P, it is of course possible to perform appropriate processing such as assigning serial numbers to each of the MOs. is there.
[0140]
On the other hand, when the recording operation to the MO of the raw data file related to the n-th designation is completed, next, as specified in step S116, the raw data designated separately (related to the (n + 1) th and subsequent subjects P). It is checked whether the file exists. In step S116, if a plurality of subjects P have been designated, and the recording operation for all of them has not been completed, the process returns to step S110 again. However, at this time, as in step SS2, a process of incrementing the number n representing the designated subject P by 1 is performed.
[0141]
If it is determined in step S116 that the recording operation to the MO regarding all the specified raw data files has been completed, the entire processing is completed.
[0142]
With the above operations, the recording operation for the designated raw data file to the external recording device 40 (MO) is completed.
[0143]
In addition to the above processing, when the subject P or the raw data file is designated, how many MOs are necessary to record the raw data file according to the designation, For example, an image display unit 32 may present a “recording schedule table” about how a raw data file is allocated and recorded for a plurality of MOs to the apparatus user. Good. Furthermore, it may be configured that the apparatus user can actively specify how to allocate and record the raw data file to a plurality of MOs for the presentation of the recording schedule table.
[0144]
In any case, even if the MO or other recording medium is used, the work of storing the cut raw data file on the recording medium is still automatically performed. You can enjoy the effect.
[0145]
As described above, according to the present embodiment, since raw data can be selectively stored, the capacity to store the raw data can be reduced, and the storage time is shortened. In addition, the number of required media such as recording media can be reduced, and the cost can be reduced.
[0146]
In particular, it is useful in a multi-slice X-ray CT apparatus with an increased opportunity to save raw data, for example, scanning a wide range for screening purposes, but for saving raw data when there is an abnormality only in a specific part, It is very effective.
[0147]
In addition, in an X-ray CT apparatus in which the time stored in the storage device (disk) from the external recording device (MO) cannot be reconstructed, necessary image data and necessary raw data are obtained at a time after all the inspections are completed. There was a need to save. For example, in the case of multi-slices with four columns, it takes 30 minutes or more for the writing process to store data of about 30 seconds in the MO. For this reason, if the writing process is continued, the apparatus user cannot perform other operations for 30 minutes.
[0148]
On the other hand, in the present embodiment, since raw data can be cut out and stored in a compact manner, the time required for storage is as short as about 15 minutes. In addition, when reconstructing based on the extracted raw data, only the necessary part can be reconstructed, and the reconfiguration time can be shortened. This can improve the throughput of each process such as scanning, reconstruction, post-processing, etc., and as a result, it is possible to save using the time between patients and the next patient. Is possible.
[0149]
Further, when reconstructing or confirming later, the raw data is acquired (stored) only at a partial location, so that the raw data can be easily searched. Further, unlike the prior art, the user of the apparatus is not restricted to the MO storage work for a long time.
[0150]
[Second Embodiment]
Next, a second embodiment according to the present invention will be described with reference to FIGS. In the following, description of the substantially similar configuration of the first embodiment will be omitted, and only different parts will be described. FIG. 12 is a functional block diagram showing an overall schematic configuration of the X-ray CT apparatus of this example.
[0151]
In the first embodiment described above, the reconstructed tomographic image is used as the user interface for designating the raw data cutout range or the image file is used. In the present embodiment, In the case where there is no reconstructed image data, an example of specifying a range to be cut out using real-time reconstruction (play & reverse) using raw data is disclosed.
[0152]
Here, the X-ray CT apparatus has a function of displaying a reconstructed image “play and reverse” (or real-time reconstruction) in a moving image display, and on the moving image display screen realizing this function. An attempt is made to specify the cutout range from one part to another part. In real-time reconstruction, the collected raw data is reconstructed and displayed at high speed, and a moving image can be displayed like a movie.
[0153]
FIG. 11 discloses an example of a display mode displayed when such a “play & reverse” function is selected. As shown in the figure, a cursor is formed in the lower part of the “play & reverse” display screen 140, and the image changes when the cursor is operated.
[0154]
In the present embodiment, on the display screen 140 that displays a real-time moving image, two places, a start designation unit and an end designation unit are provided so that a range can be designated. Then, only the data from the position specified by the start specifying unit to the position specified by the end specifying unit is stored.
[0155]
On the display screen 140, the entire photographed range is sequentially displayed as a moving image, and the portion corresponding to the current position of the cursor is displayed by changing the image with time as the cursor moves. At this time, tracking is performed in order from the beginning to the end, but when it is desired that only a portion of a certain range is necessary, the range is designated and the range is reconfigured.
[0156]
In this case, a plurality of cutout ranges may be set. For example, in screening, all the raw data from the head to the abdomen of the subject are collected, and later, only the region with the head and the region with the abdomen are designated with two cutout ranges, Each moving image is operated.
[0157]
Next, a specific configuration for achieving the above functions will be described with reference to FIG. As shown in FIG. 11, the control system 200 of the X-ray CT apparatus includes a real-time reconstruction processing means 25a that performs real-time reconstruction processing in addition to the same configuration as that of the first embodiment, and the above-described real-time reconstruction. A real-time reconstructed image display unit 201 for displaying an image and a cut-out range designation unit 202 for designating a cut-out range on the display screen on which the real-time reconstructed image is displayed are configured.
[0158]
In the system having such a configuration, the moving image processed by the real-time reconstruction processing unit 25a is displayed on the real-time reconstruction image display unit 201.
[0159]
For example, first try to reconstruct the whole raw data in real time, then narrow the range of raw data to be reconstructed in real time while watching the video, narrow the range of the raw data of the necessary part, Determine the raw data range of the required part. If the necessary range of raw data area is determined, save is executed.
[0160]
In the case of displaying a moving image, the tomographic image that changes every moment in the above-described “perspective mode” and the display thereof are displayed, or the multi-image is displayed while continuously rotating (while performing the “perspective mode”). It may be assumed that the tomographic image is reconstructed and displayed by slicing, or various other moving images are displayed.
[0161]
Here, in order to perform real-time reconstruction and display a moving image, for example, the same processing as in the case of one rotation is performed on two-dimensional projection data from multiple directions obtained by a plurality of rotations by continuous rotation scanning. Is repeated to obtain a plurality of volume data. At this time, for example, by gradually shifting the range of data used for reconstruction (range of the rotation angle of the system), more volume data that is slightly different in time is obtained.
[0162]
Then, from the volume data that is slightly different in time, the images that are slightly different in time in the set display form are generated and displayed in order. As shown in FIG. 11, it becomes possible to observe the moving image in real time. That is, it is possible to display an image as a moving image in parallel with continuous scanning.
[0163]
In the following, data processing in the case of this continuous rotation scan will be described a little. In the following description, it is assumed that the angle range of projection data necessary to reconstruct one 3D image data is 360 °. However, the angle range is not 360 °, for example, 180 ° + view angle. It is good.
[0164]
First, in the configuration of the first embodiment, the X-ray tube 12 continuously rotates at a high speed around the subject together with the X-ray detector 13. The time required for one rotation is t0 (for example, 1 second or less). The projection data collected one after another is preprocessed in almost real time. The reconstruction unit 25 then reconstructs the volume data based on the preprocessed 360 ° projection data. Then, based on the reconstructed volume data, the data processing unit 27 generates image data such as a tomographic image of an arbitrary cross section, a projection image from an arbitrary direction, and a three-dimensional surface image. This image data is displayed on the image display unit 32.
[0165]
When displaying a moving image as described above, for each scan from the first scan to the n-th scan, a series of processing from the scan to the image display is performed in parallel (for example, the first scan In parallel with the reconstruction process based on the above, a second scan is performed, etc.), and the images are reconstructed one after another based on the two-dimensional projection data obtained successively, and displayed one after another. Such a series of continuous reconstruction processing is performed, and the real-time reconstruction processing means 25a is controlled so as to display one after another on the image display unit 32. Here, “real-time reconstruction” means that high-speed reconstruction is performed in parallel with scanning, and in the case of raw data clipping and saving, scanning is already completed and raw data is saved. Therefore, it may be referred to as “play and reverse reconstruction”. For this purpose, a configuration in which “real-time reconstruction” in this specification is replaced with “play and reverse reconstruction” as necessary is also included.
[0166]
Therefore, the real-time reconstruction processing means 25a is shorter than the time t0 required to collect projection data for a predetermined angle range (for example, 360 °) in parallel with the two-dimensional projection data collection operation (scan). The processing capability necessary for reconstructing the volume data and the processing capability necessary for generating the image data from the volume data in a shorter time than the reconstruction time of the volume data are provided. Furthermore, the real-time reconstructed image display means 201 is equipped with a counter, a memory, and the like necessary to start displaying the image data after a predetermined time from the start point or end point of the period of the collection operation of the projection data originating from the image data. is doing.
[0167]
As described above, according to the present embodiment, it is possible to designate a cutout range of raw data while referring to a moving image while exhibiting the same operational effects as those of the first embodiment described above.
[0168]
In particular, even when raw data remains and there is no reconstructed image, a reconstructed image can be obtained by reconstructing again based on the extracted raw data by cutting out and storing the raw data. .
[0169]
For example, in CT fluoroscopy, there is no reconstructed image, so if you want to leave an image part of a specific area as evidence, for example, you can scan for 1 minute (continuous exposure) and collect raw data However, it is only necessary to save only a specific area.
[0170]
Thus, it is very effective when storing raw data of CT fluoroscopy with a long scan time but a small amount of actually required data.
[0171]
Further, in fluoroscopy, the time for collecting data is longer than about 1 minute to 2 minutes compared to a normal scan, the size of raw data is large, and storage takes time. In this embodiment, By cutting out the necessary range of raw data, the capacity is reduced, so that it does not take a long time to save.
[0172]
Further, in the present embodiment, since the raw data is cut out and stored only for necessary portions, the necessary capacity can be reduced and is not overwritten at the time of reconstruction.
[0173]
[Third Embodiment]
Next, a third embodiment according to the present invention will be described with reference to FIGS. FIG. 14 is a functional block diagram showing a schematic configuration of a main part of the X-ray CT apparatus according to the present embodiment.
[0174]
In the present embodiment, an example in which raw data is cut out while referring to a scanogram is disclosed. Specifically, on the display screen 220 as shown in FIG. 13, a perspective image when a volume model after reconstruction is projected from a predetermined viewpoint position onto a predetermined projection plane is displayed. Then, a raw data cut-out range is set by selectively setting a predetermined range with a line for the fluoroscopic image.
[0175]
By using such a user interface, the cutout range of the raw data can be set after grasping the specific position of the organ or the like in the scanogram, so that unnecessary data need not be saved.
[0176]
Here, a specific configuration for achieving the above-described function will be described with reference to FIG. As shown in FIG. 14, the control system 240 of the X-ray CT apparatus displays a scanogram display means 241 for displaying a scanogram and the scanogram displayed in addition to the same configuration as that of the first embodiment. On the display screen, a cutout range specifying unit 242 for specifying a cutout range and a scano image processing unit 243 for processing a scano image are included.
[0177]
In the control system 240 having such a configuration, the reconstructed reconstructed image is projected onto the projection plane from a predetermined viewpoint position with respect to the volume model by the scanano image processing means 243 to generate a scanano image. Then, this is displayed on the display screen by the scanogram display means 241.
[0178]
Then, the scanogram is displayed on the display screen. When a scanogram exists, the cutout range designation means 242 designates a range to be cut out using the scanogram. For example, if there is a scanogram from the past to the abdomen and only the raw data of the lung field need be stored for the patient with the scanogram, the storage start portion and the storage end portion on the scanogram Draw a line to indicate that only the raw data between them will be saved.
[0179]
Specifically, first, a normal scanogram, which is an X-ray fluoroscopic image, is taken, and the scanogram is displayed on a predetermined display screen. Thereafter, a range is designated by a scan plan for scanning from one place to another place. At this time, when the data area of the scanogram displayed on the display screen is assumed to be from A to B, for example, if the actually required area is from C to D, the range is saved as the save start part. The designation of the end portion is determined and selected by line segment, scanning is performed only for designation from C to D, and raw data in the designated range is saved.
[0180]
Note that the scanogram is actually referred to. For example, if only the liver portion is necessary, only the liver portion is designated on the scanogram. As a result, the range to be saved automatically is not determined by one scanogram, but the data amount at the time of saving is further reduced by specifying.
[0181]
Also, if you look at the scanogram, you can't figure out where it's wrong, but if you really want to keep only the liver part, you can see where the liver is by looking at the scanogram. Specify the cutout part above.
[0182]
As described above, according to the present embodiment, a wide range is scanned. However, as in the case where there is an abnormality only in a specific part, the scan time is long but the data actually required by the device user is small. This is particularly effective for storing raw data in such cases.
[0183]
[Fourth Embodiment]
Next, a fourth embodiment according to the present invention will be described with reference to FIG. FIG. 15 is a schematic diagram showing an overall configuration of a “medical image diagnostic system” according to the present embodiment. In the present embodiment, a “medical image” or an X-ray CT apparatus acquired by other various medical image diagnostic apparatuses such as the X-ray CT apparatus, SPECT apparatus, or MRI apparatus of any of the above-described embodiments. A system for recording “raw data” acquired by the above will be described.
[0184]
As shown in FIG. 15, the medical image diagnostic system 260 is a system capable of recording or reproducing raw data, medical images, and the like, and includes an X-ray CT apparatus 261, a SPECT apparatus 262, an MRI apparatus 263, and an X-ray. Various medical image diagnosis apparatuses including the image apparatus 264, 3D / WS (workstation) 270 which is one of image reference terminals, and a plurality of personal computers 281 which are image reference terminals. 281n or a medical image storage device (image server) (not shown) that stores each medical image forms a network via the communication line C.
[0185]
Each of the various medical image diagnostic apparatuses 261 to 264 can generate and display a three-dimensional image or the like, and the X-ray CT apparatus 261 allows the degree of absorption to be spatially transmitted through the subject. By detecting the changed X-rays, the SPECT device 262 detects gamma rays emitted from radioisotopes (RI) administered and distributed in the body, and the MRI device 263 detects nuclear magnetic resonance signals. As a result, it is possible to acquire information in the subject and reconstruct a three-dimensional image based on the acquired information. As the X-ray image device 264, for example, a so-called “angio device” having a C arm, an Ω arm, or the like may be assumed. In the present invention, various medical image diagnostic apparatuses (IVR-CT, etc.) other than the above may be assumed.
[0186]
The 3D / WS270 is equipped with a high-speed CPU, large-capacity memory, and in some cases, an accelerator dedicated to image processing, etc., and has been specially developed for 3D image display functions, and for various 3D observations. It also has various functions.
[0187]
Further, original data (referred to as “raw data”) for realizing these functions is supplied from the various medical image diagnostic apparatuses 261 to 264 described above. This can be performed via a communication line C (via a network) connecting the 3D / WS 270 and the various medical image diagnostic apparatuses 261 to 264.
[0188]
Further, the 3D / WS 270 has a recording / reading device 271 capable of recording data to and reading data from a large-capacity recording medium M that can be transported, such as MO and DVD. Is attached.
[0189]
On the other hand, as shown in FIG. 13, a plurality of personal computers 281... 281n are connected to the communication line C. These personal computers 281,..., 281 n are assumed to be easily available on the market, and may generally be equipped with a low-speed CPU and a small-capacity memory as compared with the 3D / WS270. However, these personal computers 281,..., 281 n are connected to recording / reading devices 282,..., 282 n capable of recording data on the recording medium M and reading data from the medium M, similarly to the 3D / WS 270 described above. Has been.
[0190]
In the present embodiment, in particular, the recording / reading device 282 records raw data on the recording medium M, and the recording / reading devices 282,..., 282n read raw data from the recording medium M. 3D image display or observation is possible based on the raw data recorded through the recording / reading device 271 and read out through the recording / reading devices 282,.
[0191]
Further, the communication line C can be connected to the outside as shown in FIG. As used herein, “external” may be assumed to be the so-called Internet, for example, or may be assumed to be another wired or wirelessly connected network.
[0192]
Further, each of the personal computers 281,..., 281n, or the 3D / WS 270 is the “data file selection means”, “cutout range designation means”, “image data display means”, “ Specify the clipping range with reference to the image data, such as “raw data cutout processing means”, “accompanying information calculation means”, “file generation means”, “transfer processing means”, “write processing means”, etc. It may have a main configuration necessary for “cutting out and storing in a recording medium”. Alternatively, although not described in detail, in the second embodiment described above, a “cut-out range is specified with reference to a real-time reconstructed image” such as “real-time reconstructed image display means”, and raw data is cut out to a recording medium. It may have the main configuration needed to “save”. Further, in the third embodiment described above, it is necessary for “specifying a cutout range with reference to a scanogram and cutting out raw data and storing it in a recording medium” such as “scanno display unit”. It may have a main configuration. It goes without saying that these configurations may be provided in each medical image diagnostic apparatus or medical image storage apparatus.
[0193]
Therefore, each of the personal computers 281,..., 281n, or a terminal constituting the 3D / WS 270 may be configured with a range designating unit for designating a necessary cut-out range among all the collected raw data. Each of the recording / reading devices 282,..., 282n, or the recording / reading device 271 corresponds to “recording means” in the present invention. Therefore, this recording means has a function of recording the cut-out raw data transmitted from the medical image diagnostic apparatus on the recording medium M based on the operation input at the terminal, and can be included in the terminal.
[0194]
The writing processing means, transfer processing means, and the like can also constitute the “control means” referred to in the present invention. This control means controls transmission so that the cut-out raw data is written into the recording means. The control means, the extraction means (raw data cut-out processing means) in the first embodiment, Are preferably configured to be processed by each medical image diagnostic apparatus. This is because it is easy to secure an area for temporarily storing all the raw data and the cut-out raw data.
[0195]
These configurations are not limited to those provided in the medical image diagnostic apparatus, and it is only necessary that the same function can be achieved as a system provided in the terminal or the medical image storage apparatus.
[0196]
With this configuration, each of the personal computers 281,..., 281n or the 3D / WS 270 not only acquires medical image information from the medical image diagnostic apparatus, but also collects it in the X-ray CT apparatus 261 or the like. With respect to the raw data, it is possible to specify a cutout range and store it in the recording medium M.
[0197]
Next, the operation and effect of the medical image diagnostic system of the present embodiment as the above configuration example will be described. Note that the present invention is characterized in that recording or transmission is performed by designating a range of raw data, and hereinafter, this point will be mainly described.
[0198]
First, the raw data generated by the various medical image diagnostic apparatuses 261 to 264 is transferred to the 3D / WS 270 via the communication line C, that is, the network, and the transferred raw data is mounted on the 3D / WS 270. Is recorded in the recorded recording / reading device 271. The 3D / WS 270 can display a reconstructed image, a three-dimensional image, or an observation by performing various display functions and observation functions as described above based on the raw data transferred in this way. Thus, the doctor can perform a diagnosis based on the image display.
[0199]
That is, first, the 3D / WS 270 shifts to a “data recording mode” appropriately programmed in advance, and selects the data to be recorded on the recording medium M from the various raw data transferred. carry out. More specifically, for example, a “SAVE” button is displayed on a monitor configured as 3D / WS270, and the button is clicked with an operation means such as a mouse (transition to a data recording mode), and One of the plurality of raw data files (= a plurality of raw data) to be displayed may be clicked (selection of the raw data file) or the like (all not shown).
[0200]
When the above operation is completed, next, in what mode the selected raw data is recorded (for example, bit length reduction or compression described later) is sequentially set. These settings are performed through a display screen on a monitor in 3D / WS270. Of course, in the present invention, other selection items may be set.
[0201]
As this setting item, for example, it is possible to set whether to record the selected raw data. In this case, if “record” is selected, only raw data is recorded on the recording medium M. Such a selection is performed by, for example, clicking any of the YES / NO check boxes with a mouse or the like in 3D / WS270. If “do not record” is selected, the entire setting process ends.
[0202]
In the above, when “record” is selected, settings relating to the details are subsequently performed. The details specifically relate to settings such as “how to set the raw data recording conditions” and “where to store the raw data”.
[0203]
For example, a setting relating to “how to make a raw data recording condition”, a setting relating to “extracting and extracting a necessary specific range” is performed.
[0204]
“Extracting and extracting a necessary specific range” means that only a predetermined part of the original (size) raw data is extracted and recorded on the recording medium M. That is, it is equivalent to extracting a part of the raw data and recording it. In this case, when “Extract and extract necessary specific range” is selected, a list display of the file of raw data to be recorded is executed, and the device user can select any area or area. A mode in which a “specific range” is set by setting (extracting) a window (not shown) is most preferable.
[0205]
Alternatively, a display screen for designating a range for cutting out a necessary portion is displayed. Various examples disclosed in the first to third embodiments can be adopted as examples of the display screen.
[0206]
For example, when specifying with reference to an image or file of image data as in the first embodiment, when specifying with reference to a real-time reconstructed image as in the second embodiment, the third embodiment The case of specifying with reference to a scanogram such as
[0207]
In addition to the case of referring to an image, it may be a case of specifying with reference to incidental information (condition information) or a case of cutting out based on a range specified in advance without referring to anything.
[0208]
Then, after performing these settings, recording on a predetermined recording medium M is performed by performing an operation input for executing recording.
[0209]
Now, the storage of the cut raw data as described above is performed on the recording medium M, so that the following effects can be obtained. That is, since the raw data recorded on the recording medium M is only necessary, more raw data can be recorded on one recording medium M.
[0210]
In particular, since it can be cut out and stored via a network, each patient's raw data in a plurality of X-ray CT apparatuses can be centrally stored using a personal computer as an image reference terminal. Can be made more efficient. Further, a reconstructed image can be obtained as necessary.
[0211]
In any case, the data size of the raw data can be reduced, and as a result, more raw data can be recorded on the recording medium M.
[0212]
And in these settings, by selecting “Extract and extract the necessary specific range”, the data size of the raw data after extraction described above can be reduced, and as a result, the recording medium M is more A lot of raw data can be recorded.
[0213]
In addition, “compression” may be performed during storage. In addition, when compressing, a decompression program is recorded on the recording medium M at the same time. This also helps to reduce the data size of the raw data.
[0214]
When the above settings are completed, the raw data can be recorded on the recording medium M by clicking the “YES button” or the like in the button relating to whether or not to actually execute the recording. This is done based on the setting.
[0215]
The recording medium M recorded / created in this way can be attached to the recording / reading devices 282,..., 282n connected to the personal computers 281,. The personal computers 281,..., 281n can perform reconstruction and display images by reading raw data from the mounted recording medium M.
[0216]
Specifically, one of the screens on which the raw data file list is displayed is selected (for example, double-clicked) by an appropriate operation means (for example, a mouse or the like) on the personal computers 281,. Thus, the selected image may be reproduced.
[0217]
As described above, according to the medical image diagnostic system of the present embodiment, more raw data records can be stored on the recording medium. Further, it can be carried out without any burden on the apparatus user.
[0218]
Since the communication line C is also connected to the outside, the contents can be transmitted to the outside as necessary. Even in such a form, image display or the like can be performed on a general-purpose personal computer 281,..., 281n, etc., and this form is also within the scope of the present invention.
[0219]
Furthermore, in the above description, the various settings are performed, for example, the cutout setting is performed in the 3D workstation, and the raw data is recorded on the recording medium M in the recording / reading device 271. However, the present invention is not limited thereto. Alternatively, the configuration may be such that the raw data can be transferred and recorded to any of the recording / reading devices 282a,. Of course, in this case, it is assumed that the recording medium M has a capacity that allows it.
[0220]
Further, the present invention is not limited to the setting items related to the raw data mentioned in the above embodiment. Furthermore, it is a matter of course that a plurality of various medical image diagnostic apparatuses may be provided.
[0221]
Furthermore, the image on the personal computer 281,..., 281 is recorded through both actions of recording on the recording medium M in the recording / reading apparatus 271 and reading out from the recording medium M in the recording / reading apparatuses 282 a,. , A recording / reading device 282a,..., 282n recording on the recording medium M, and a recording / reading device 271 reading from the recording medium M, recording / reading devices 282a,. Recording on the recording medium M in any one of them and reading from the recording medium M in any of the recording / reading devices 282a,.
[0222]
Although the apparatus and method (processing procedure) according to the present invention have been described according to some specific embodiments thereof, the implementation described in the main text of the present invention can be made without departing from the spirit and scope of the present invention. Various modifications to the form are possible. For example, in the first embodiment described above, the raw data cutout range is set with reference to the reconstructed tomographic image. However, the present invention is not limited to this. Absent. That is, not only specifying the extraction range using the reference image (image information) but also specifying the extraction range using various numerical information (accompanying information or condition information) such as scan time and helical travel distance. Also good.
[0223]
In other words, the range to be cut out may be specified by the condition information that defines the conditions for scanning. As this condition information, for example, scan time information for scanning the subject, an X-ray source for exposing X-rays is continuously rotated around the subject, and the subject is moved in the body axis direction. The helical travel distance information when the subject is helically scanned, the X-ray source for exposing the X-ray is continuously rotated around the subject and the subject is moved in the body axis direction. For example, bed position information of a bed on which the subject is placed. As the reference image, as shown in the first to third embodiments, the image data reconstructed, the real-time (play and reverse) reconstructed image of the subject, the subject There are scano statues.
[0224]
Alternatively, for example, the condition information may be cut out in a predetermined range, such as automatically cutting out and saving from 0 to 9 in the condition information of 0 to 10. In other words, it is not necessary to have a range specifying means for specifying the raw data cut-out range.
[0225]
In this case, an extraction unit that cuts out and extracts raw data in a preset clipping range out of all the collected raw data, and a storage unit that performs writing processing on the extracted raw data and stores it in a recording medium What is necessary is to have at least a function of cutting out raw data and storing the cut out raw data. In addition, it is good to carry out by the said condition information as a method of designating the range at the time of presetting.
[0226]
In addition, in the above embodiment, the description has been made with “MO (magneto-optical disk)” in mind as a specific example of the recording medium M on which raw data or medical images are recorded. However, the present invention is not limited to this form. For example, in place of the MO, a form using a ZIP, an IC memory, an IC card, a DVD, an optical disk, etc. is naturally applicable.
[0227]
Further, in the above embodiment, the recording operation to the MO is performed one by one, but the present invention is not limited to such a form. That is, in the external recording device or the recording / reading device, for example, a plurality of MO trays are provided, and a recording mechanism (not shown) is provided according to the plurality of MO trays, so that recording operations for a plurality of MOs can be performed in parallel. It is good also as a structure which can be performed.
[0228]
Further, in the above-described embodiment, a helical scan in which at least one of the gantry and the bed is moved during the scan so that the X-ray tube 101 draws a spiral trajectory around the subject, and other single-helical and multiple-helical (series) , Programmed), combined helical, etc. At this time, it is preferable to set the imaging condition including at least one of the detection element array used for data collection, the helical pitch, the scan range, the scan time, and the tube current to an optimum value.
[0229]
In the first embodiment, data processing such as reconstruction and cross-sectional conversion and display operations are performed in the X-ray CT apparatus 1 (such a form is common). Alternatively, in the invention, these data processing and the like may be executed by an external image processing apparatus. Further, when such an external image processing apparatus is used, the data sent from the X-ray CT apparatus to the image processing apparatus can be either before reconstruction, after reconstruction, or immediately before display after data processing. Even in the state, the effect of the above-described embodiment is not disturbed.
[0230]
Further, in the above description, it is possible to display a tomographic image of an arbitrary cross section, a projection image in an arbitrary direction, a three-dimensional surface image, and the like. It is good also as a structure which displays the information which changes temporally, such as a value and an electrocardiogram, with a graph, and also displays the time of the main image currently displayed on the graph.
[0231]
In addition, the storage device (disk) is configured to be divided for image data and raw data, but may be a single storage device. Furthermore, since there is a limit to the capacity that can be stored in the storage device, the necessary data may be stored in an image server or the like as shown in the fourth embodiment when it is full.
[0232]
Furthermore, in the above embodiment, an X-ray CT apparatus has been described as a specific example of an apparatus from which image data and raw data are acquired, that is, a “medical image diagnostic apparatus”. However, in the present invention, “medical image diagnostic apparatus” ”Is an X-ray imaging apparatus (particularly an apparatus having a configuration called“ C arm ”or“ Ω arm ”), an IVR (interventional radiology) in which an X-ray imaging apparatus and an X-ray CT apparatus are combined— Of course, even a CT apparatus or the like can be applied.
[0233]
Furthermore, in the fourth embodiment, any raw data can be used, and any raw data photographed by a CT apparatus, an MRI apparatus, or a nuclear medicine apparatus can be applied.
[0234]
Furthermore, as the medical image diagnostic system of the fourth embodiment, it is possible to communicate with one or more medical image diagnostic apparatuses for acquiring medical image information via a network and to refer to the medical image information. In addition to the above terminals, a medical image storage device (image server) that can communicate with the medical image diagnostic apparatus via a network and stores medical image information acquired by the medical image diagnostic apparatus may be provided.
[0235]
At this time, a range designating unit for designating a necessary clipping range out of all collected raw data to the terminal, and the clipped raw data transmitted from the medical image diagnostic apparatus based on the operation input to the recording medium Recording means for recording, and further, in the medical image diagnostic apparatus, extraction means for extracting and extracting the raw data of the specified clipping range from the entire collected raw data, the extracted raw data after the clipping, It is preferable to have control means for controlling transmission so as to perform writing processing on the recording means. In addition, the range specifying unit, the extracting unit, and the storing unit in the first embodiment may be any on the system, for example, may be formed in a medical image storage device, You may form in a terminal, respectively.
[0236]
Furthermore, the above embodiment includes various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. That is, it goes without saying that examples include combinations of the above-described embodiments, or any one of them and any of the modifications. Moreover, some structural requirements may be deleted from all the structural requirements shown in the embodiment.
[0237]
【The invention's effect】
As described above, according to the present invention, only a necessary portion of raw data is selected by the range selection unit, the raw data is cut out by the extraction unit, and can be stored on the recording medium by the storage unit. Therefore, the capacity for storing raw data can be reduced, and the storage time is shortened. Further, since the number of recording media used is reduced, an economic effect is also produced.
[0238]
In particular, when saving raw data where the scan time is long but the actual required data is small, or when scanning a wide range for screening purposes, but there is an abnormality only in a specific part, it is useful for saving raw data. Is very effective.
[Brief description of the drawings]
FIG. 1 is a functional block diagram showing an example of a schematic configuration of an X-ray CT apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a principle for cutting out raw data in the X-ray CT apparatus of FIG. 1;
FIG. 3 is a functional block diagram showing an example of a specific configuration for extracting raw data in the X-ray CT apparatus of FIG.
FIG. 4 is an explanatory diagram for explaining the principle when raw data is collected by the X-ray CT apparatus of FIG. 1;
FIG. 5 is an explanatory diagram for illustrating a data structure of raw data collected by the X-ray CT apparatus of FIG. 1;
6A and 6B are explanatory views showing an outline of the data structure of an image file reconstructed based on raw data collected by the X-ray CT apparatus of FIG.
FIG. 7 is an explanatory diagram showing an example of a display screen displayed on the image display unit of the X-ray CT apparatus.
FIG. 8 is an explanatory diagram showing an example of a display screen displayed on the image display unit of the X-ray CT apparatus.
9 is a flowchart showing an example of a processing procedure of raw data cutout processing in the X-ray CT apparatus of FIG. 1;
10 is a flowchart showing an example of a processing procedure of a raw data cut-out process in the X-ray CT apparatus of FIG.
FIG. 11 is an explanatory diagram showing another example of the display screen of the image display unit as another example of the X-ray CT apparatus according to the embodiment of the present invention.
12 is a functional block diagram showing an outline of a main part of the configuration of the X-ray CT apparatus of FIG.
FIG. 13 is an explanatory diagram showing another example of the display screen of the image display unit as another example of the X-ray CT apparatus according to the embodiment of the present invention.
14 is a functional block diagram showing an outline of a main part of the configuration of the X-ray CT apparatus of FIG.
FIG. 15 is a functional block diagram showing an example of an overall schematic configuration of the medical image diagnostic system of the present invention.
[Explanation of symbols]
1 X-ray CT system
22 Data collection unit
24 storage devices
25 Reconstruction part
26 Storage device
28 Central control unit
31 Operation unit
32 Image display
40 External recording device
260 Medical diagnostic imaging system
M recording medium

Claims (8)

An X-ray CT apparatus that scans the subject by exposing X-rays from multiple directions to the subject, collects raw data, and performs image reconstruction based on the raw data,
Display means for displaying a reference image subjected to image processing based on the raw data;
Using the reference image displayed on the display means, range designation means for designating a necessary clipping range among all the collected raw data;
Extraction means for cutting out and extracting the raw data of the cutout range specified by the range specifying means from all the collected raw data;
A storage unit that stores the raw data extracted by the extraction unit by performing a writing process on a recording medium by an operation of a storage setting from an operator;
X-ray CT apparatus characterized by including. The reference image includes image reconstructed image data,
The X-ray CT apparatus according to claim 1 , wherein the range specifying unit specifies the cutout range with reference to the image data. The reference image includes a real-time (play and reverse) reconstructed image of the subject,
The X-ray CT apparatus according to claim 1 , wherein the range specifying unit specifies the cut-out range with reference to the real-time (play and reverse) reconstructed image. The reference image includes a scanogram of the subject,
The X-ray CT apparatus according to claim 1 , wherein the range specifying unit specifies a cut-out range with reference to the scanogram. The range designation means designates a necessary cutout range among all the collected raw data based on condition information that defines conditions for scanning the subject. X-ray CT system. The condition information includes scan time information for scanning the subject,
The X-ray CT apparatus according to claim 5 , wherein the range specifying unit specifies the cut-out range based on the scan time information. The condition information is obtained when the X-ray source for exposing the X-ray is continuously rotated around the subject and the subject is moved in the body axis direction to perform helical scanning when the subject is helically scanned. Including distance information,
The X-ray CT apparatus according to claim 5 , wherein the range designating unit designates the cut-out range based on the helical travel distance information. The condition information is obtained by continuously rotating an X-ray source for exposing the X-rays around the subject and placing the subject when the subject is moved in the body axis direction. Including location information,
The X-ray CT apparatus according to claim 5 , wherein the range specifying unit specifies the cut-out range based on the bed position information.

Images