JPH11244280A - Computerized tomography - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously and respectively display areas in real time in an optimal state by providing a display means capable of simultaneously displaying respective images on two or more display image screens or display areas and a means capable of immediately changing a parameter used for preprocessing, reconstituting processing and display processing. SOLUTION: When indication to successively advance a processing parameter sequence is issued from an operation unit 5, a group of processing parameter sets for preprocessing, reconstituting processing and display processing is acquired from the parameter set setting part 4 so that this is delivered to the operation processing part 2. Therefore, plural preprocessing, reconstituting processing and display processing using a group of a plural number of preset values using a group of these parameter sets can be successively performed. A sequence of the whole image using a preset value of an optimal parameter, an image containing the body surface and the interest part, an interest part image and an image corresponding to the tip part of a needle of a biopsy needle can be displayed on display areas 31, 32, 33, 34 of the image display part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer tomography apparatus that repeatedly performs a scanning operation for collecting projection data at the same position or a plurality of positions on a subject.

[0002]

2. Description of the Related Art In a general X-ray CT apparatus, a rotating anode X-ray tube is used as an X-ray source, and the X-ray is irradiated in a direction including the rotation axis in a plane perpendicular to the rotation axis of the gantry. An X-ray tube is mounted on a gantry, and X-rays are applied from multiple directions to a subject lying in the direction of the rotation axis by a scanning operation that mechanically rotates the gantry.
Irradiate the line. In order to acquire data at high speed, it is necessary to rotate the gantry on which the X-ray tube is attached at high speed. In this case, the rotating anode of the rotating anode X-ray tube is subjected to very large gravity and the rotating anode X-ray The pipe will not work properly. This limits the time for data collection. In the currently manufactured X-ray CT apparatus, the shortest data acquisition time is about 0.6 seconds. The X-ray radiated from the X-ray tube passes through the subject, is converted into an electric current by an X-ray detector, and is converted into digital data by a data collection circuit. Preprocessing is performed on the projection data, and reconstruction processing is performed on the preprocessed data. Image processing for display is performed on the data subjected to the reconstruction processing, and this is displayed on an image display device. At present, the calculation processing time for processing one slice of data requires about 3 seconds. In these X-ray CT apparatuses, scanning is first performed to collect projection data of a plurality of slices, and then image reconstruction processing of the projection data is performed.
Observing an image is a basic photographing method.

An electron beam scanning X-ray CT apparatus controls an electron beam emitted from an electron gun and scans an X-ray target annularly arranged around a subject in 50 ms or 100 ms. To obtain projection data. The scanning of the electron beam can be repeated by setting a rest time of 8 ms or 16 ms. The X-rays generated by the X-ray target are transmitted to the subject and then converted to current by the X-ray detector.
The data is converted into digital data by a data collection circuit. Preprocessing is performed on this data, and reconstruction processing is performed on the preprocessed data. Image processing for display is performed on the data subjected to the reconstruction processing, and this is displayed on an image display device. In the conventional apparatus, it took about 3 seconds per slice for pre-processing and reconstruction processing. Thus, a scan of 50 ms, 8
When scanning of multiple slices of electron beam is repeated with a pause time of 100 ms, a scan time of 100 ms, and a pause time of 16 ms, continuous image reconstruction processing and display of the result are performed in real time. Could not. Therefore, scanning with an electron beam is first performed to collect projection data of a plurality of slices, then image reconstruction processing of the projection data is performed, and thereafter, an image of a plurality of slices is displayed.

[0004] In a biopsy by puncturing a biopsy needle, an X-ray CT apparatus is used in order to accurately grasp the position of the biopsy needle. However, as described above, data collection and reconstruction of the X-ray CT apparatus require a certain amount of time, and cannot be used for real-time observation such as X-ray fluoroscopy using an X-ray fluoroscopy apparatus. It is common practice to take a tomographic image for confirmation before and after needle insertion.

In a biopsy using a biopsy needle puncture, an X-ray CT
Attempts have been made to use a device to display the movement of a biopsy needle in real time. It takes about 0.6 seconds to acquire one slice of projection data, and almost the same time is required to reconstruct one slice of projection data. Techniques for updating a reconstructed image by reconstructing data have been developed. However, even in this case, in order to completely update the data for one slice, it takes time to acquire the data for one slice, that is, about 0.6 seconds.

When performing a biopsy by puncturing a biopsy needle under an X-ray CT guide, in order to accurately grasp the position of the biopsy needle, an entire image displaying at least the entire tomographic plane of the subject and the needle of the biopsy needle are used. A region-of-interest reconstructed image that enlarges the preceding portion and displays it in detail is desired. In addition, it is desired that the reconstructed region of interest image is changed in size according to the movement of the tip of the biopsy needle and the center thereof is moved. In addition, in order to observe the tissue of the subject and the biopsy needle in detail, it is desired to change the parameters such as the reconstruction filter and the image filter as needed to observe the parameters. However, as described above, it takes a long time for the reconstruction calculation, and because of the limitation of the exposure dose to the subject, the X-ray C
The fact that T-scanning cannot be continued, while changing the reconstruction area or reconstruction parameters in a short time has not been realized due to the difficulty of human judgment and the time required for operation.

[0007] A radiological examination (interventionradiradiol) combined with a therapeutic technique which has been actively performed in recent years.
ogy, interventional radiology), it is necessary to dynamically operate a scalpel, a needle, a catheter, and the like. To display these as tomographic images under the best conditions, place the tip of the scalpel, needle, and catheter in the center of the reconstruction area, provide a sufficiently small reconstruction area, display it, and then use a high-speed scalpel, needle. There is a need to change this setting while promptly following the movement of the catheter so that the tip of the scalpel or needle can always be drawn under favorable conditions. However, as described above, the time required for the reconstruction calculation is long, and the scan cannot be continued for a long time due to the limitation of the exposure dose to the subject. It has not been possible to make the change due to the difficulty of human judgment and the time required for operation.

In recent years, inspections for performing CT scanning over a wide range have increased due to the development of helical scan CT and the like. In this case, various types of anatomical regions are included in a reconstructed tomographic image obtained by one continuous scan. For example, the area from the lower abdomen to the lower limb is imaged by one continuous scan. In this case, the bone area, muscle, soft tissue, skin, etc. are included, There are window values and window widths suitable for the area and organization. However, the conventional X-ray CT apparatus cannot observe a reconstructed image of a window value and a window width suitable for a bone region, muscle, soft tissue, and skin in real time while scanning.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to address the above problems, and has as its object to pre-process acquired data by simultaneously using a plurality of parameters during an acquisition scan of projection data. , Reconstruction processing and display processing, and successively displaying the resulting images on a plurality of display screens or display areas in real time without delay in synchronization with data collection, thereby realizing bone and lung fields. region,
Areas such as soft tissues can be displayed simultaneously in the optimum condition in real time. Also, the whole image of the part with fast movement such as heartbeat and the region of interest can be displayed simultaneously in the optimum conditions in real time. It is an object of the present invention to provide a computed tomography apparatus capable of displaying the state and fast movement of an instrument or the like in real time in an area and conditions suitable for the entire image and the needle tip.

[0010]

According to a first aspect of the present invention, there is provided a computer tomographic apparatus including a temporal and spatial change of a subject by repeatedly performing a scan for collecting projection data of the subject from multiple directions at a high speed. Data collection means for collecting data, and data collected within a period of time that can be continuously synchronized with data collection by configuring preprocessing, reconstruction processing, and display processing so that they can be processed in a sufficiently short time Processing unit that enables pre-processing, reconstruction processing, and display processing to be performed using two or more types of processing parameters, and displays the resulting images on two or more display screens or display areas. And a means for enabling parameters used for pre-processing, reconstruction processing and display processing to be changed without delay.

According to a second aspect of the present invention, there is provided a computer tomography apparatus which collects data including temporal and spatial changes of a subject by repeatedly performing a scan for collecting projection data of the subject from multiple directions at high speed. Means and
Pre-processing, reconstruction processing, and display processing of this collected data within a time that can be continuously synchronized with data collection by configuring the pre-processing, reconstruction processing, and display processing to be performed in a sufficiently short time An arithmetic processing unit that enables to execute by using two or more types of processing parameters;
Display means for enabling the resulting images to be displayed simultaneously on two or more display screens or display areas, and parameters for use in pre-processing, reconstruction processing, and display processing. Means for enabling continuous change without delay for each constituent image.

According to a third aspect of the present invention, there is provided a computer tomographic apparatus which collects data including temporal and spatial changes of a subject by continuously performing high-speed scanning of collecting projection data of the subject from multiple directions. Collection means,
For each time interval shorter than the time required to collect "data corresponding to the projection angle required to reconstruct one tomographic image", the latest "necessary to reconstruct one tomographic image" Pre-processing, reconstruction processing, and display processing using "projection angle data" using two or more types of processing parameters within the time that can be continuously synchronized with data collection. An arithmetic processing unit and display means for enabling each of the resulting images to be displayed simultaneously on two or more display screens or display areas;
Means for enabling a parameter used in the reconstruction processing and the display processing to be continuously changed without delay for each reconstructed image obtained as a result.

According to a fourth aspect of the present invention, there is provided a computer tomography apparatus which collects data including temporal and spatial changes of a subject by continuously performing high-speed scanning of collecting projection data of the subject from multiple directions. Collection means,
Pre-processing, reconstruction processing, and display processing using two or more processing parameters at least once per time to collect "data for the projection angle required to reconstruct one tomographic image" An arithmetic processing unit that can be executed within a time that can be continuously synchronized with the acquisition, and the resulting images can be displayed simultaneously on two or more display screens or display areas. Display means for
Means for enabling a parameter used for pre-processing, reconstruction processing, and display processing to be continuously changed without delay for each reconstructed image obtained as a result.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a computer tomography apparatus according to the present invention will be described below. FIG. 1 is a schematic diagram showing the configuration of the embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of the embodiment of the present invention. In this embodiment, an X-ray CT apparatus of an electron beam scanning system is shown as an example. The electron beam 13 emitted from the electron gun 12 is controlled, and is moved for 50 milliseconds or 1 minute on the X-ray target 11 arranged annularly around the subject.
By scanning in 00 milliseconds, data for one slice is acquired. The scanning of the electron beam can be repeated by setting a rest time of 8 ms or 16 ms. X-rays generated by the X-ray target
The X-ray detector 1 transmits the subject lying on the bed 62 and
At 4, the data is converted to a current, and the data collection circuit 15 converts the current to digital data.

The arithmetic processing unit 2 performs preprocessing and image reconstruction processing using a plurality of different parameters, in this embodiment, four kinds of parameters, to obtain four kinds of image data having different parameters. Subsequently, the image data is subjected to image display processing using a plurality of different image processing parameters, in this embodiment, four types of parameters, to obtain four types of images having different parameters. The image display device 3 has a plurality of image display screens or image display areas, and has a function of displaying a plurality of images on them at the same time.
It has a function of simultaneously displaying four types of images in four display areas 3, 34, and simultaneously displays four types of images with different parameters output from the arithmetic processing unit 2.

In the conventional apparatus, it took about 3 seconds per slice for pre-processing and reconstruction processing. Thus, a scan of 50 ms, a pause of 8 ms, or 1
When the electron beam scanning of a plurality of slices was repeated with the scanning of 00 milliseconds and the pause time of 16 milliseconds, the reconstruction processing and the display of the result could not be performed continuously in real time. In this embodiment, by improving the arithmetic processing unit for performing pre-processing, reconstruction processing, and display processing, approximately 50
Pre-processing, reconstruction processing, and display processing of two different parameters are performed simultaneously in milliseconds, and X-ray scanning, pre-processing, reconstruction processing, and display processing can be performed in a pipeline manner. This makes it possible to perform the reconstruction process and display the result in synchronization with the scanning by the electron beam. In the case of the scanning of 50 milliseconds and the pause time of 8 milliseconds, two sets of 17 slices per second are used. 100 images
In the case of a millisecond scan and a pause time of 16 milliseconds, it has become possible to display four sets of images at 8 slices per second in real time in synchronization with data acquisition.

The reconstruction processing of scan data includes convolution processing and back projection processing. The parameters used in the convolution processing include the type of filter for the convolution calculation and the filter coefficients. Include the size and center position of the image reconstruction area, and the image display parameters used for the display processing of the reconstructed data include a window width, a window center, and a spatial filter. The parameter setting unit 4 has a function of supplying these parameters to the image processing apparatus 2 in real time, and includes a processing parameter set setting unit 41, a processing parameter set sequence setting unit 42, and a processing parameter set sequence control unit 43.

The processing parameter set setting section 41 is configured so as to be able to set a plurality of processing parameter sets, that is, a plurality of parameter sets used for preprocessing, convolution processing, back projection processing, image display processing, and the like. Have been. The processing parameter set sequence setting section 42 is capable of setting a processing parameter set to be switched along with the progress of the inspection and a sequence thereof, and a plurality of sets simultaneously used by the arithmetic processing unit 2, in this embodiment, Set the four processing parameter sets in the order of the time sequence. The processing parameter set sequence control unit 43 is a part for synchronizing the sequence of a set of processing parameter sets to be switched with the progress of the examination and the progress of the examination, and a signal transmitted from the operating device 5 in accordance with the operator's instruction. With this, the sequence of the set of the processing parameter set is advanced. This can be reversed if necessary. The processing parameter set sequence control unit 43 outputs to the arithmetic processing unit 2 a set of processing parameter sets used for preprocessing, reconstruction processing, and display processing of scan data. The processing parameter set sequence control unit 43 also has a function of transmitting a control signal for starting and stopping a scan to the scan control unit 61.

An application to a biopsy will be described. When applying to biopsy, first perform an experiment in advance for each scene in the biopsy, and based on the experiment, determine the values of various parameters used for preprocessing, reconstruction processing, and image display processing suitable for the scene. This is set as a parameter set for the scene and set as a set of preset values of the processing parameter set setting unit 41. Generally, 5 to 10 types of processing parameter sets are registered. Figure 4 is an example

Next, in the processing parameter set sequence setting section 42, the numbers of the parameter sets selected in the order of the scene that progresses with the progress of the puncture by the operator are registered in order.
Since pre-processing, reconstruction processing, and display processing are performed simultaneously using a plurality of different parameter sets at each time, it is necessary to set a plurality of sets for each time. That is, this is a two-dimensional table corresponding to a plurality of image display areas simultaneously with the temporal sequence. At the same time, parameters such as the default number of scans to be processed using the parameter set, the default scan time interval, and the center position of the reconstruction area are set. FIG. 5 shows an example.

An instruction to sequentially advance the processing parameter set sequence is issued from the operating device 5 to the processing parameter set sequence control unit 43 based on an instruction in accordance with the progress of the puncturing by the puncturing operator. The processing parameter set sequence control unit 43 acquires a set of processing parameter sets for pre-processing, reconstruction processing, and display processing from the processing parameter set sequence setting unit 42, and passes this to the arithmetic processing unit 2.
This makes it possible to sequentially execute a plurality of pre-processing, reconstruction processing, and display processing using a set of these parameter sets on a scan data collection sequence. Also, the processing parameter set sequence control unit 43
Can output a scan start / stop control signal to the scan control unit 61, so that X-ray scanning can be interrupted and resumed in accordance with the progress of puncturing, and the scan time interval Can be changed, and unnecessary patient exposure can be avoided. In addition,
The image display device 3 continuously displays the image obtained by the scan until the image obtained by the next scan is updated.

Based on the instruction of the surgeon performing the puncture, for the acquisition sequence of the scan data, the pattern is sequentially switched between preprocessing, reconstruction processing, and display processing using a set of these parameters, that is, a set of preset values. The sequence of images corresponding to the whole image using the preset values of the optimal parameters, the image including the body surface and the site of interest, the site of interest image, and the position of the tip of the biopsy needle Are displayed on the display areas 31 and 3 of the display device 3.
2, 33, and 34 can be displayed. As an example, when a needle is punctured in a certain region of interest, the reconstructed image of the X-ray CT image is set in the pattern of FIG. 4 according to the progress of the puncture needle by the operator, and is sequentially changed according to the steps of FIG. It was configured to go. Here, the size of the reconstruction area and the reconstruction parameters are preset by prior study, so that the operator can sequentially select them according to the progress of the needle insertion. FIG. 6 shows an example. The center position of the reconstruction area in the image display area 4 is automatically controlled so that the tip of the needle is located at the center of the screen after step 2. This is configured so that manual operation by an assistant is also possible. Parameters such as the reconstruction filter, the size of the reconstruction area, the image display filter, and the like can be manually changed as needed by the judgment of the operator.

In a radiological examination also serving as a therapeutic procedure, parameters of pre-processing, reconstruction processing, and display processing suitable for dynamically operating a scalpel, a needle, a catheter, etc. are set to preset values based on a prior experiment. The optimum parameters can be selected by performing the pre-processing, reconstruction processing, and display processing using the set of multiple parameters on the sequence of the collected scan data without delay at the instruction of the operator performing the examination. Whole image using preset values of
It has become possible to display on the display device a sequence of images corresponding to the region of interest image, the scalpel, the needle, and the tip of the catheter. Thus, simultaneously with the whole image and the image of the region of interest, a reconstruction image of the region of interest centered on the tip of the scalpel, needle, and catheter is drawn in good conditions by moving while following the movement of the scalpel, needle, and catheter. Made it possible.

FIG. 7 is a diagram showing a schematic flow from scanning to image display in a conventional CT apparatus, and FIG. 8 is a diagram showing a schematic flow from scanning to image display in this embodiment. Here, an example in which the scan time is 100 ms, the scan pause time is 20 ms, and the reconstruction time is 50 ms is shown. In the conventional computed tomography apparatus of FIG. 7, a reconstruction process is performed following scanning, that is, X-ray irradiation, and an image is displayed subsequently. However, since the reconstruction time is longer than the scan time, , The reconstruction cannot be completed before the X-ray irradiation of the next scan is completed. In the present embodiment shown in FIG. 8, a reconstruction process is performed following scanning, that is, X-ray irradiation, and image display is performed subsequently. The time required for the reconstruction is configured to end before the X-ray irradiation of the next scan ends. The image display is maintained until the reconstruction of the image of the next scan is completed.
The parameters for the reconstruction processing and the parameters for the display of both images are set by the arithmetic processing unit 2 according to the default timing from the parameter set unit 4 or the instruction from the operation unit 5.
Sequentially sent to This enables tomographic images and their temporal changes to be displayed continuously without delay in real time in synchronization with data acquisition during the acquisition scan of projection data, and that the reconstructed parameters and display parameters be displayed for each reconstructed image. It was possible to change quickly without delay.

By using the device according to the present invention, in a biopsy by puncturing a biopsy needle under an X-ray CT guide, an entire image of a subject, an image including a body surface and a site of interest, and an image of a site of interest are displayed. In addition, it is possible to display an enlarged image of the region of interest, which displays the tip portion of the biopsy needle in detail, as the puncture progresses, and to accurately grasp the position of the biopsy needle. This enabled fluoroscopy using the optimal reconstruction parameters as the biopsy progressed, eliminating the need for long fluoroscopy and preventing an increase in radiation dose. More detailed and optimal image information was obtained, making it possible to increase the safety and certainty of the procedure.

In a radiological examination which also serves as a therapeutic procedure, an enlarged image of a region of interest, which displays the tip of a scalpel, a needle, a catheter or the like in detail, while displaying the entire image of the subject, in accordance with the progress of the procedure The display can be made sequentially, and the position of the scalpel, needle, catheter, etc. can be accurately grasped. This makes it possible to perform fluoroscopy using the optimal reconstruction parameters as the procedure progresses, so that the scalpel, needle, and catheter can be immediately followed by rapid movement of the scalpel, needle, catheter, etc. and blood flow dynamics. It is possible to always draw the tip and the region of interest under good conditions. In addition, it has become possible to dynamically observe changes in anatomical structures and blood flow dynamics in real time during embolization.

When a CT scan over a wide range is performed by one continuous scan, a large number of reconstructed tomographic images obtained by one continuous scan include various anatomical regions. become. The area from the lower abdomen to the lower limb is imaged by one continuous scan, which includes the bone region, muscle, soft tissue, skin, and the like. In this embodiment, since reconstruction and image display processing can be performed simultaneously using four different parameters, a reconstruction filter and a window value and a window width suitable for a bone region, muscle, soft tissue, and skin can be obtained. It has become possible to simultaneously observe a reconstructed image with real time in real time.

In addition, the range from the head and neck to the chest is photographed by one continuous scan. In this case, a bone region, a lung field region, soft tissue, skin, and the like are included. In this embodiment, reconstruction and image display processing can be performed using four different parameters at the same time, and reconstruction filters and window values suitable for a bone region, a lung field region, soft tissue, and skin in real time. Thus, it becomes possible to observe a reconstructed image having a window width.

FIG. 3 is a block diagram showing the configuration of the second embodiment of the present invention. In this embodiment, a data storage device 21 including a memory and a high-speed magnetic disk is provided. The data storage device can store data output from the data collection circuit. The stored data is transferred to the arithmetic processing unit by a control signal sent from the processing parameter set sequence control unit to the data storage device 21 in accordance with the operation of the operation unit 5, and pre-processed and reprocessed by the parameter from the parameter set setting unit. A configuration process and a display process are performed and displayed on the image display unit. In addition to the functions described in the first embodiment, it is possible to display an image later at the same time as the data collection.
The data storage device 21 can also be configured to store preprocessed data.

In this embodiment, an X-ray CT apparatus of the electron beam scanning type has been described as an example. FIG. 9 shows a rotating anode X-ray tube as an X-ray source, and a mount on which the X-ray tube is mounted. Ordinary X to acquire data by rotating
It is a figure which shows the schematic flow from scanning of a line CT apparatus to image display, and corresponds to Claim 3 in the third embodiment of the present invention. In this example, X-ray scanning is performed continuously, but it takes 0.6 seconds to acquire projection data (180 degrees + fan angle) required to reconstruct one reconstructed image. doing. The image reconstruction processing time is about 0.05 seconds. Image reconstruction is performed approximately every 0.12 seconds using the latest 180 ° + fan angle projection data at that time. That is, the latest “projection data required for reconstructing one tomographic image” is obtained at each time interval shorter than the time for collecting “projection data necessary for reconstructing one tomographic image”. An arithmetic processing unit that enables pre-processing, reconstruction processing, and display processing using “angle data” to be executed continuously in synchronization with data collection using two or more types of processing parameters; and Display means for simultaneously displaying each resulting image on two or more display screens or display areas; and parameters used for pre-processing, reconstruction processing, and display processing without delay for each resulting reconstructed image. Means for enabling continuous change, so that the latest data is acquired at intervals shorter than the time required to collect "data corresponding to the projection angle required to reconstruct one tomographic image". Using "data for the projection angle required to reconstruct one tomographic image", using two or more processing parameters, and continuously changing it in real time for each reconstructed image Can be provided.

FIG. 10 uses a rotating anode X-ray tube as an X-ray source, and rotates a gantry to which the X-ray tube is attached, thereby obtaining data from a normal X-ray CT apparatus scanning to image display. It is a figure which shows a schematic flow and corresponds to Claim 4 in 4th Example of this invention. In this example, X-ray scanning is performed continuously, but projection data (180 ° +
It takes 0.6 seconds to acquire the fan angle). The image reconstruction processing time is about 0.05 seconds. Image reconstruction is performed approximately every 0.12 seconds using a different image reconstruction parameter set. That is, pre-processing, reconstruction processing, and display processing using one or more processing parameters at least once per time for collecting “data corresponding to the projection angle required to reconstruct one tomographic image” And a processing unit that can continuously execute the data acquisition in synchronization with data collection.
Display means for simultaneously displaying each resulting image on two or more display screens or display areas;
Means for enabling the parameters used in the reconstruction processing and the display processing to be continuously changed without delay for each reconstructed image obtained as a result. At least once per time to collect the data for the projection angle required to perform the processing, and make it possible to continuously change it in real time for each reconstructed image using two or more processing parameters. A computer tomograph can be provided.

In the above description, a so-called two-dimensional CT apparatus which collects projection data of one section at the same time has been described as an example. However, a CT apparatus which collects projection data of two or more sections at the same time, a surface detector So-called three-dimensional C using
The same can be applied to T.

[0033]

According to the first aspect of the present invention, the computer tomographic apparatus collects data including temporal and spatial changes of the subject by repeatedly performing a scan for collecting projection data of the subject from multiple directions at high speed. Data collection means,
Pre-processing, reconstruction processing, and display processing of this collected data within a time that can be continuously synchronized with data collection by configuring the pre-processing, reconstruction processing, and display processing to be performed in a sufficiently short time An arithmetic processing unit that enables to execute by using two or more types of processing parameters;
Display means for enabling the resulting images to be displayed simultaneously on two or more display screens or display areas, and changing parameters used for preprocessing, reconstruction processing, and display processing without delay. Means that enable pre-processing, reconstruction processing, and image display processing using multiple parameters and display them on multiple display screens or display areas in real time in synchronization with data collection. It became possible to do. This makes it possible to display images that have been pre-processed, reconstructed, and displayed using multiple optimal parameters on multiple display screens or display areas as the diagnosis or examination progresses.
It can provide effective means for treatment planning and treatment. Also,
A plurality of sites having different optimal parameters such as a reconstruction processing filter, a window value, and a window width can be simultaneously observed in real time, and effective information for diagnosis, treatment planning, treatment, and the like can be provided.

According to a second aspect of the present invention, there is provided a computer tomography apparatus which collects data including temporal and spatial changes of a subject by repeatedly performing a scan for collecting projection data of the subject from multiple directions at high speed. Means and
Pre-processing, reconstruction processing, and display processing of this collected data within a time that can be continuously synchronized with data collection by configuring the pre-processing, reconstruction processing, and display processing to be performed in a sufficiently short time An arithmetic processing unit that enables to execute by using two or more types of processing parameters;
Display means for enabling the resulting images to be displayed simultaneously on two or more display screens or display areas, and parameters for use in pre-processing, reconstruction processing, and display processing. Means for enabling continuous change without delay for each constituent image, so that an image that has been subjected to preprocessing, reconstruction processing, and image display processing using a plurality of parameters can be displayed on a plurality of display screens or In the display area, it is possible to display in real time in synchronization with data collection, and it is possible to sequentially switch these parameters. This makes it possible to display, on multiple display screens or display areas, images that have been preprocessed, reconstructed, and displayed using multiple optimal parameters as the diagnosis or examination progresses. Since these parameters can be sequentially switched, an effective means for diagnosis and treatment can be provided. In addition, since the region of interest and the moving object can be continuously drawn as an image using the optimal parameters for the current object, information useful for diagnosis, treatment planning, treatment, etc. can be obtained. Can be provided. In addition, it is possible to simultaneously observe a plurality of parts having different optimal parameters such as a reconstruction filter, a window value, and a window width in real time, thereby providing information effective for diagnosis, treatment planning, treatment, and the like.

According to a third aspect of the present invention, there is provided a computer tomography apparatus which collects data including temporal and spatial changes of a subject by continuously performing high-speed continuous scanning for collecting projection data of the subject from multiple directions. Collection means,
For each time interval shorter than the time required to collect "data corresponding to the projection angle required to reconstruct one tomographic image", the latest "necessary to reconstruct one tomographic image" Pre-processing, reconstruction processing, and display processing using "projection angle data" using two or more types of processing parameters within the time that can be continuously synchronized with data collection. An arithmetic processing unit and display means for enabling each of the resulting images to be displayed simultaneously on two or more display screens or display areas;
Means for continuously changing, without delay, the parameters used for the reconstruction processing and the display processing for each reconstructed image obtained as a result. Images that have undergone reconstruction processing and image display processing can be displayed on multiple display screens or display areas in real time in synchronization with data collection, and these parameters can be switched sequentially. became. This makes it possible to display, on multiple display screens or display areas, images that have been preprocessed, reconstructed, and displayed using multiple optimal parameters as the diagnosis or examination progresses. Since these parameters can be sequentially switched, it is possible to provide effective information for diagnosis, treatment planning, treatment, and the like. In addition, it is possible to simultaneously observe a plurality of parts having different optimal parameters such as a reconstruction filter, a window value, and a window width in real time, thereby providing information effective for diagnosis, treatment planning, treatment, and the like.

According to a fourth aspect of the present invention, there is provided a computer tomography apparatus which collects data including temporal and spatial changes of a subject by continuously performing high-speed scanning of collecting projection data of the subject from multiple directions. Collection means,
Pre-processing, reconstruction processing, and display processing using two or more processing parameters at least once per time to collect "data for the projection angle required to reconstruct one tomographic image" An arithmetic processing unit that can be executed within a time that can be continuously synchronized with the acquisition, and the resulting images can be displayed simultaneously on two or more display screens or display areas. Display means for
Means for continuously changing the parameters used for pre-processing, reconstruction processing and display processing without delay for each reconstructed image obtained as a result. Images that have been subjected to preprocessing, reconstruction processing, and image display processing can be displayed on a plurality of display screens or display areas in real time in synchronization with data collection. This makes it possible to display images that have been pre-processed, reconstructed, and displayed using multiple optimal parameters on multiple display screens or display areas as the diagnosis or examination progresses. Effective means for treatment planning, treatment, etc. can be provided. In addition, it is possible to simultaneously observe a plurality of parts having different optimum parameters such as a reconstruction processing filter, a window value, and a window width in real time, thereby providing information effective for diagnosis, treatment planning, treatment, and the like.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a computer tomography apparatus according to the present invention.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of another embodiment of the present invention.

FIG. 4 is an example of setting a parameter set set by a processing parameter set setting unit;

FIG. 5 is an example of a parameter set sequence set by a processing parameter set sequence control unit.

FIG. 6 is an example of a processing parameter output from a processing parameter set sequence control unit.

FIG. 7 is a diagram showing timings of data collection, image reconstruction, and image display in a conventional computed tomography apparatus.

FIG. 8 is a view showing timings of data collection, image reconstruction, and image display in the embodiment of the present invention.

FIG. 9 is a diagram showing timings of data collection, image reconstruction, and image display in the third embodiment of the present invention.

FIG. 10 is a diagram showing timings of data collection, image reconstruction, and image display in a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Data collection part 2 Operation processing part 3 Image display part 4 Parameter set part 5 Operating device 11 X-ray target 12 Electron gun 13 Electron beam 14 X-ray detector 15 Data collection circuit 21 Data storage device 31 Image display area 1 32 Image Display area 2 33 Image display area 3 34 Image display area 4 41 Processing parameter set setting unit 42 Processing parameter set sequence setting unit 43 Processing parameter set sequence control unit 61 Scan control unit 62 Bed

Claims (4)

[Claims] 1. A data acquisition means for acquiring data including temporal and spatial changes of a subject by repeatedly performing a scan for collecting projection data of the subject from multiple directions at a high speed, and performing preprocessing and reprocessing. Two or more types of pre-processing, reconstruction, and display processing of this collected data within the time that can be continuously synchronized with data collection by configuring so that configuration processing and display processing can be performed in a sufficiently short time An arithmetic processing unit enabling execution using the processing parameters described above, display means enabling simultaneous display of the resulting images on two or more display screens or display areas, and Means for enabling parameters used for processing, reconstruction processing, and display processing to be changed without delay. 2. A data collection means for collecting data including temporal and spatial changes of a subject by repeatedly performing a scan for collecting projection data of the subject from multiple directions at a high speed; Two or more types of pre-processing, reconstruction, and display processing of this collected data within the time that can be continuously synchronized with data collection by configuring so that configuration processing and display processing can be performed in a sufficiently short time An arithmetic processing unit enabling execution using the processing parameters described above, display means enabling simultaneous display of the resulting images on two or more display screens or display areas, and Means for enabling parameters used for processing, reconstruction processing, and display processing to be continuously changed without delay for each reconstructed image obtained as a result. Computer tomography equipment. 3. A data acquisition means for acquiring data including temporal and spatial changes of an object by continuously performing high-speed scanning of acquisition of projection data of the object from multiple directions, and "one sheet". The projection angle required for reconstructing a single tomographic image for each time interval shorter than the time required to collect the data for the projection angle required for reconstructing the tomographic image Processing using "data of
An arithmetic processing unit that enables the reconstruction processing and display processing to be executed within a time that can be continuously synchronized with data collection using two or more types of processing parameters, and each image obtained as a result. Display means for enabling the simultaneous display on two or more display screens or display areas;
Means for enabling parameters used for preprocessing, reconstruction processing, and display processing to be continuously changed without delay for each reconstructed image obtained as a result. 4. A data acquisition means for acquiring data including temporal and spatial changes of an object by continuously performing high-speed continuous acquisition scans of projection data of the object from multiple directions. Continues pre-processing, reconstruction processing, and display processing using two or more processing parameters at least once per time to collect data for the projection angle required to reconstruct the tomographic image of the data. Processing unit enabling execution within a time that can be synchronized with each other, and display means enabling simultaneous display of each resulting image on two or more display screens or display areas And means for continuously changing parameters used for pre-processing, reconstruction processing and display processing for each resulting reconstructed image without delay. Pew tomography.