JP4560957B2 - X-ray CT system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an X-ray CT apparatus (X-ray computed tomography apparatus), and relates to a technique for quickly setting an X-ray CT imaging region composed of a plurality of imaging areas in an imaging plan.
[0002]
[Prior art]
In recent years, an X-ray CT apparatus which is not an exaggeration to say a general-purpose medical diagnostic apparatus, as shown in FIG. 13, an X-ray tube 51 for irradiating a subject (patient) M with an X-ray fan beam FB, and a large number of X-ray CT apparatuses. An X-ray imaging mechanism 53 is provided in which an X-ray detector 52 in which line detection elements 52 a are arranged in a line is opposed to the subject M. This X-ray CT apparatus first obtains a transmitted X-ray image as a positioning image using the X-ray imaging mechanism 53, and then performs an imaging plan on the obtained transmitted X-ray image to define an X-ray CT imaging region. After the setting, the X-ray imaging mechanism 53 is used again to perform actual X-ray tomography.
[0003]
In this conventional X-ray CT apparatus, for example, when X-ray tomography is to be performed with the imaging region as the head, as described above, the image is acquired on the transmitted X-ray image of the head obtained as the positioning image. An X-ray CT imaging region is set by planning, and actual X-ray tomography is performed for the set X-ray CT imaging region. Specifically, as shown in FIG. 14, an X-ray CT imaging region XU composed of a plurality of imaging areas (for example, four imaging areas XUa to XUd) is set. In each of the imaging areas XUa to XUd, each imaging condition is set for each area, and one or more slices are captured under the same imaging condition in the same area. Examples of the imaging conditions (imaging conditions for slice imaging) include slice thickness, slice pitch, tube current, tube voltage, and imaging speed.
[0004]
Further, the above-described imaging areas XUa to XUd and the respective imaging conditions for each of those areas are created in advance by an operator and set in the conventional apparatus. As shown in FIG. 14, the transmission X-ray image CR for the positioning image previously captured and the box cursors XBa to XBd indicating the four imaging areas XUa to XUd are simultaneously displayed on the screen of the display monitor 55. . The box cursors XBa to XBd are displayed at initial positions on the screen. In the state displayed in this way, the image pickup areas XUa to XUd are moved by moving the box cursors XBa to XBd to desired positions by performing screen input operations using an input device (not shown) such as a mouse. Is adjusted to set the X-ray CT imaging region XU for the actual X-ray tomography, and the order of XUa → XUb → XUc → XUd for each imaging area XUa to XUd of the set X-ray CT imaging region XU In this configuration, slice imaging is performed. The reason for setting each imaging area XUa to XUd in which each imaging condition is set for each area is that each imaging condition depends on the state of the imaging region (for example, the state of the skull in the head as the imaging region). This is because it is necessary to set for each of the imaging areas XUa to XUd.
[0005]
That is, the X-ray tube is moved while moving the top 54 on which the subject M is placed in the direction of the body axis Z of the subject M (direction perpendicular to the paper surface) according to the X-ray CT imaging region XU set in the imaging plan. 51 and the X-ray detector 52 are rotated around the body axis Z of the subject M so that the subject M is irradiated with the X-ray fan beam FB from the X-ray tube 51 and simultaneously the X-rays output from the X-ray detector 52 The detection data is collected as X-ray CT image creation data for each slice plane of the subject M, and image reconstruction is performed based on the collected X-ray detection data at the subsequent stage of the X-ray detector 52, and finally X A line CT image is created.
[0006]
[Problems to be solved by the invention]
However, the conventional X-ray CT apparatus has a problem that when the X-ray CT imaging region XU is composed of a plurality of imaging areas, the X-ray CT imaging region XU cannot be set quickly. That is, when the previous X-ray CT imaging region XU is composed of a plurality of imaging areas (for example, four imaging areas XUa to XUd), the imaging areas XUa to XUd displayed simultaneously on the display screen are Since it can only be moved individually on the screen, it takes a considerable amount of time to complete the X-ray CT imaging region XU by sequentially moving the four imaging areas XUa to XUd one by one to a desired position. It will end up.
[0007]
This invention makes it a subject to provide the X-ray CT apparatus which can perform the setting of the X-ray CT imaging area | region which consists of a some imaging area rapidly in the case of an imaging plan in view of said situation.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the X-ray CT apparatus according to the invention of claim 1 is configured such that the positioning image of the subject and the respective imaging conditions are set for each area, and 1 in the same area under the same imaging condition. An imaging area display control means for simultaneously displaying on the screen of the display means an imaging area where at least one slice is captured, and an adjustment of the imaging area displayed on the screen of the display means on the screen An imaging region setting means for setting an X-ray CT imaging area composed of a plurality of imaging areas, and slice imaging is performed in a predetermined order for each imaging area of the X-ray CT imaging area set by the imaging area setting means. In an X-ray CT apparatus comprising X-ray imaging means for obtaining X-ray CT image creation data, (A) The imaging area is displayed in the form of a box cursor on the screen of the display means, The photographing area setting means Changed the box cursor Specific imaging area of Adjustment Gana And an imaging area automatic tracking means that automatically performs the same adjustment as described above for other imaging areas correlated with the specific imaging area so as to follow the adjustment of the specific imaging area. Yes.
[0009]
The invention of claim 2 The subject positioning image and the respective imaging conditions are set for each area, and within the same area, an imaging area where one or more slices are captured under the same imaging condition is displayed on the screen of the display means simultaneously. An imaging area display control means, an imaging area setting means for setting an X-ray CT imaging area comprising a plurality of imaging areas by adjusting an imaging area displayed on the screen of the display means on the screen; X-ray CT provided with X-ray imaging means that obtains X-ray CT image creation data by performing slice imaging for each imaging area of the X-ray CT imaging area set by the imaging area setting means in a predetermined order In the apparatus, (A1) when a specific imaging area is adjusted by the imaging area setting means, the same adjustment as described above is performed on the other imaging area correlated with the specific imaging area. An imaging zone automatic follow-up means for automatically performing to follow the adjustment, When the specific imaging area is adjusted by the imaging area setting unit, the imaging area automatic follow-up unit is configured to specify a specific imaging area for an imaging area whose imaging order is later than the specific imaging area as the correlation. It is configured to automatically perform the same adjustment as described above so as to follow the adjustment of the imaging area.
[0010]
The invention of claim 3 is the X-ray CT apparatus according to claim 1 or 2, further comprising an imaging area connecting means for connecting the imaging areas on the screen of the display means in the order of imaging, When the position of a specific imaging area is changed by adjustment on the screen of the display means, the imaging area automatic tracking unit specifies the position of the imaging area whose imaging order is later than the specific imaging area. The imaging area connecting means is instructed to automatically change the imaging order to the position connected after the imaging area.
[0011]
According to a fourth aspect of the present invention, in the X-ray CT apparatus according to the first or second aspect, the imaging area automatic follow-up means is on the screen of the display means. Indicates X-ray CT imaging area specific Imaging When adjustment of the size or angle of the area is performed, the adjustment of the specific imaging area is followed for the imaging area whose imaging order is later than the specific imaging area as the correlation. A similar corresponding size or angle adjustment is automatically performed.
[0012]
According to a fifth aspect of the present invention, in the X-ray CT apparatus according to the first or second aspect of the present invention, the same imaging area superimposing means for displaying a plurality of the same imaging areas on the screen of the display means. The imaging area automatic follow-up means is configured to specify the correlation as the correlation when a specific imaging area of a plurality of imaging areas displayed in a superimposed manner on the screen of the display means is adjusted. It is characterized in that the same adjustment as described above is automatically performed for an imaging area whose imaging order is later than the imaging area.
[0013]
According to a sixth aspect of the present invention, in the X-ray CT apparatus according to the first or fifth aspect, an imaging start position aligning unit that aligns an imaging start position of an imaging area on the screen of the display unit, and the display unit The image pickup end position aligning means for aligning the image pickup end position of the image pickup area on the screen and the image pickup center position aligning means for aligning the image pickup center position of the image pickup area on the screen of the display means are selected and operated. The imaging area automatic follow-up means changes one of an imaging start position, an imaging end position, and an imaging center position of a specific imaging area on the screen of the display means by a selection operation. Then, the corresponding positions of the imaging start position, the imaging end position, and the imaging center position for the imaging area whose imaging order is later than the specific imaging area are changed after the specific imaging area is changed. To automatically aligned with the location, and is characterized in that instructs the corresponding means of the and the imaging start position aligning means and the imaging end alignment means and the image pickup center alignment means.
[0014]
[Action]
Next, the operation of the X-ray CT apparatus of the present invention will be described.
According to the X-ray CT apparatus of claim 1, when setting an X-ray CT imaging region composed of a plurality of imaging areas, the imaging area display control unit is configured to determine the object positioning image and each area. Each imaging condition is set, and an imaging area in which one or more slices are captured under the same imaging condition in the same area is simultaneously displayed on the screen of the display unit. An X-ray CT imaging area consisting of a plurality of imaging areas is set by adjusting the imaging area displayed on the screen of the display means by using the imaging area setting means on the screen of the display means with reference to the positioning image. According to the set X-ray CT imaging region, that is, slice imaging is performed in a predetermined order for each imaging area of the X-ray CT imaging region, and X-ray CT image creation data is obtained. When a specific imaging area is adjusted during the adjustment of the imaging area by the above-described imaging area setting means, the imaging area auto-following means performs the following operation on other imaging areas correlated with the specific imaging area. The same adjustment as described above is automatically performed so as to follow the adjustment of a specific imaging area. Therefore, it is not necessary to adjust each imaging area individually, and only by adjusting a specific imaging area, other imaging areas correlated with this specific imaging area follow the adjustment of the specific imaging area. The X-ray CT imaging region composed of a plurality of imaging areas can be quickly set during imaging planning.
[0015]
According to the X-ray CT apparatus of the second aspect, when the specific imaging area is adjusted by the imaging area setting unit, the imaging area automatic follow-up unit performs other imaging having a correlation with the specific imaging area. Adjustments similar to those described above are automatically performed on an area, that is, an imaging area whose imaging order is later than the specific imaging area so as to follow the adjustment of the specific imaging area. Therefore, when setting an X-ray CT imaging region composed of a plurality of imaging areas, adjustment of each imaging area is normally performed in the order of execution of imaging after setting, and adjustment of subsequent imaging areas is performed in advance. It is often performed in the form of adjusting the imaging area. As a result, following the adjustment of the specific imaging area (for example, the second imaging area), the specific imaging area (for example, the second imaging area) with respect to the subsequent imaging area (for example, the third imaging area or less) If the same adjustment is performed automatically, the subsequent imaging area can be adjusted smoothly and automatically, and the automatic tracking adjustment similar to the adjustment of a specific imaging area is only applied to the subsequent imaging area. Since it is not performed for advanced imaging areas (for example, the first imaging area), adjustments already made to advanced imaging areas are disturbed by automatic tracking adjustment to subsequent imaging areas. In addition, the X-ray CT imaging region can be set quickly.
[0016]
According to the X-ray CT apparatus of the third aspect of the present invention, the X-ray CT apparatus includes the imaging area connecting means for connecting the imaging areas on the screen of the display means in the order of imaging. When the position of a specific imaging area on the screen is changed by adjustment, the position of the imaging area whose imaging order is later than that specific imaging area is automatically set to the position connected after that specific imaging area. Therefore, when the position of a specific imaging area is changed by adjustment, the position of the imaging area following the specific imaging area is connected after the specific imaging area. The position is automatically changed to the imaging order.
[0017]
According to the X-ray CT apparatus of the fourth aspect, the imaging area automatic follow-up means is on the screen of the display means. Indicates X-ray CT imaging area specific Imaging When an area size or angle adjustment is made, a particular imaging area is correlated with other imaging areas, i.e., imaging areas that are later in imaging order than a particular imaging area. The corresponding size or angle is automatically adjusted in the same manner as described above so as to follow the adjustment of the imaging area. Therefore, when the size of the specific imaging area (the size of the slice cross section at the time of imaging) or the angle (slice angle) is adjusted, the imaging area corresponding to the imaging area whose imaging order is later than the specific imaging area The size or angle is automatically adjusted so as to follow the adjustment of a specific imaging area, and the X-ray CT imaging area can be quickly set to adjust the size or angle of the imaging area.
[0018]
In addition, according to the X-ray CT apparatus of the fifth aspect, the X-ray CT apparatus includes the same imaging area superimposing unit that displays a plurality of the same imaging area on the screen of the display unit. When adjustment of a specific imaging area among a plurality of imaging areas displayed superimposed on the screen of the means is performed, another imaging area correlated with the specific imaging area, that is, the specific imaging area In addition, the same adjustment as described above is automatically performed for an imaging area whose imaging order is later. Therefore, in order to inspect the same imaging region a plurality of times (phase imaging inspection mode), the X-ray CT imaging region in which a plurality of the same imaging areas are overlapped is set even if it is set. The adjustment of the imaging area that is later in the imaging order than the specific imaging area among the plurality of imaging areas is automatically performed in the same manner as the adjustment of the specific imaging area, and the setting of the X-ray CT imaging area is quickly performed. The degree of freedom in setting the X-ray CT imaging region is improved.
[0019]
According to the X-ray CT apparatus of the sixth aspect, the imaging area automatic follow-up means has one of the imaging start position, the imaging end position, and the imaging center position of the specific imaging area on the screen of the display means. When changed by the selection operation, the corresponding position of the imaging start position, the imaging end position, and the imaging center position for the imaging area whose imaging order is later than the specific imaging area is changed to the specific imaging area. A corresponding one of the imaging start position alignment unit, the imaging end position alignment unit, and the imaging center position alignment unit is instructed so as to be automatically aligned to a later position. Therefore, when the imaging start position of the specific imaging area is changed, the imaging start position of the imaging area subsequent to the specific imaging area is automatically aligned with the changed position of the specific imaging area. When the imaging end position of the specific imaging area is changed, the imaging end position of the imaging area following the specific imaging area is automatically aligned with the changed position of the specific imaging area. When the imaging center position of the specific imaging area is changed, the imaging center position of the imaging area following the specific imaging area is automatically aligned with the changed position of the specific imaging area.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating the overall configuration of the X-ray CT apparatus according to the embodiment.
[0021]
In the X-ray CT apparatus of the embodiment, as shown in FIG. 1, an X-ray tube 1 that irradiates a subject M with an X-ray fan beam FB and an X-ray detector element 2a are arranged in a line. An X-ray imaging mechanism (X-ray imaging means) 3 in which the X-ray detector 2 and the X-ray detector 2 are arranged opposite to each other with the X-ray detector 2 interposed therebetween. An imaging mechanism rotation drive unit 4 that rotates around a body axis Z of M, a top plate 5 that can reciprocate in the direction of the body axis Z of the subject M (a direction perpendicular to the paper surface) while the subject M is placed, and the like It has. This X-ray CT apparatus can take a transmission X-ray image as a positioning image for setting an X-ray CT image region using the X-ray imaging mechanism 3 and also uses the X-ray imaging mechanism 3. X-ray CT image creation data can be obtained in accordance with the set X-ray CT image region. Hereinafter, each part structure of an Example apparatus is demonstrated concretely.
[0022]
As shown in FIG. 1, the imaging mechanism rotation drive unit 4 is configured to rotate the rotation ring 9 as the rotational force of the motor 6 is transmitted to the rotation ring 9 via the pulley 7 and the belt 8. Has been. The X-ray tube 1 and the X-ray detector 2 of the X-ray imaging mechanism 3 are fixed to a rotating ring 9, and as the rotating ring 9 rotates in conjunction with forward or reverse rotation of the motor 6, the X-ray tube 1 and the X-ray detector 2 rotate around the body axis Z of the subject M. The imaging mechanism rotation driving unit 4 is configured to execute a necessary rotation driving operation under the control of the imaging mechanism control unit 10.
[0023]
The irradiation control unit 11 controls the tube voltage, tube current, and the like of a high voltage generator (not shown) of the X-ray tube 1 in accordance with the set irradiation conditions from the imaging control unit 16. X-ray detection data output from the X-ray detector 2 in accordance with the irradiation of the X-ray fan beam FB from the X-ray tube 1 is collected by a data collection unit (DAS) 13.
[0024]
Further, the top plate 5 is configured to be reciprocated in the direction of the body axis Z of the subject M under the control of the top plate drive unit 12. The imaging mechanism control unit 10, the irradiation control unit 11, or the top panel drive unit 12 is controlled by the imaging control unit 16 in accordance with the input operation from the console 14A, the mouse 14B, the operation monitor 15, and the imaging progress. It is configured to be executed in accordance with a command signal sent out in a timely manner.
[0025]
On the other hand, in the X-ray CT apparatus according to the embodiment, a data processing unit 17 that processes the X-ray detection data output from the X-ray detector 2 is provided after the data collection unit 13. The data processing unit 17 includes a transmission image memory 18 that stores a transmission X-ray image as a positioning image for setting an imaging region in the subject M. When performing preliminary imaging for capturing an image for positioning, the X-ray tube 1 and the X-ray detector 2 are stopped in the state shown in FIG. 1 and the like, and the top 5 on which the subject M is placed is placed on the subject. While moving in the direction of the body axis Z of M, the X-ray tube 1 irradiates the X-ray fan beam FB and associates the X-ray detection data output from the X-ray detector 2 with the movement position of the top 5. The acquired transmission X-ray images are stored in the transmission image memory 18 as positioning images. That is, the positioning image is obtained by relatively horizontal scanning the X-ray imaging mechanism 3 in the direction of the body axis Z of the subject M.
[0026]
On the other hand, the data processing unit 17 is a detection data memory 19 for storing X-ray detection data as X-ray CT image creation data, and an image reconstruction process based on the X-ray detection data stored in the detection data memory 19. An image reconstructing unit 20 for performing the above and a CT tomographic image memory 21 for storing the finally created X-ray CT image.
When performing actual imaging for obtaining X-ray CT image creation data, the top plate 5 on which the subject M is placed is moved in the direction of the body axis Z of the subject M, and the X-ray tube 1 and the X-ray detector 2 are moved. Is rotated around the body axis Z of the subject M while the subject M is irradiated with the X-ray fan beam FB by the X-ray tube 1 and at the same time X of each slice plane of the subject M output from the X-ray detector 2. The line detection data is collected as X-ray CT image creation data and stored in the detection data memory 19. That is, X-ray CT image creation data is obtained by rotating the X-ray imaging mechanism 3 relatively in the direction around the body axis Z of the subject M.
[0027]
In addition, a display monitor 22 is disposed following the data processing unit 17. The display monitor 22 displays a positioning image or an X-ray CT image on the screen in accordance with a command from the imaging control unit 16 or the like.
[0028]
Furthermore, as described below, the X-ray CT apparatus of the embodiment has a configuration for making an imaging plan using the positioning image. That is, in the embodiment apparatus, as shown in FIG. 2, the transmission X-ray image CR, which is a positioning image taken in advance, and the respective imaging conditions are set for each area, and the same imaging conditions are set in the same area. An imaging area display control unit 23 that simultaneously displays on the screen of the display monitor 22 an imaging area (for example, four imaging areas XU1 to XU4) where one or more slices are captured, an operation console 14A, and a mouse An X-ray CT imaging region XU including a plurality of imaging areas XU1 to XU4 is set by adjusting the position, size, angle, and the like of the imaging areas XU1 to XU4 on the screen of the display monitor 22 by an input operation using 14B or the like. And an imaging region setting unit 24. In FIG. 2, for example, the imaging region is the head of the subject M, and the transmission X-ray image CR is a transmission X-ray image when the head of the subject M is viewed from the side. The X-ray CT imaging region XU is set using CR as a guide.
[0029]
As shown in FIG. 2, the imaging area XU1 corresponds to an area where four slice imaging SL1 with common imaging conditions are performed, and the imaging area XU2 is an area where four slice imaging SL2 with common imaging conditions are performed. Correspondingly, the imaging area XU3 corresponds to an area where two slice imaging SL3 with common imaging conditions are performed, and the imaging area XU4 corresponds to an area where four slice imaging SL4 with common imaging conditions are performed. . Incidentally, when the slice thicknesses of the slice imaging SL1 to SL4 are compared, the order is SL4>SL1>SL2> SL3. In the case of head imaging, the imaging areas XU1 to XU4 are combined, and the X-ray CT imaging region XU is set so that appropriate X-ray detection data can be obtained by performing slice imaging while changing the slice thickness according to the state of the skull. In the X-ray CT imaging region XU including the imaging areas XU1 to XU4, 14 slice imagings are performed. In FIG. 2, for convenience of explanation, a gap is provided between adjacent areas of the imaging areas XU1 to XU4, but in reality, a gap is provided between adjacent areas of the imaging areas XU1 to XU4. It continues without being empty.
[0030]
Specific factors of the above-described imaging conditions (imaging conditions for slice imaging) include slice pitch, tube current, tube voltage, imaging speed, and the like in addition to slice thickness. In the case of the embodiment apparatus, each of the imaging areas XU1 to XU4 in which slice imaging with common imaging conditions is collected as preset conditions by an operator and registered in a database (not shown).
[0031]
When making an imaging plan, the imaging areas XU1 to XU4 are displayed on the screen of the display monitor 22 in the form of box cursors XB1 to XB4, and the imaging area setting unit 24 responds to an input operation with the mouse 14B or the like. The X-ray CT imaging region XU is set by changing the position, size, or shape of XB1 to XB4.
[0032]
The X-ray CT apparatus according to the embodiment has a remarkable feature that the following configuration is further provided so that the X-ray CT imaging region XU can be set quickly. First, as shown in FIG. 3, an imaging area connecting unit 25 that connects the imaging areas XU1 to XU4 on the screen of the display monitor 22 in the order of imaging, and imaging of the imaging areas XU1 to XU4 as shown in FIG. The imaging start position aligning unit 26 that aligns the start positions B, the imaging end position aligning unit 27 that aligns the imaging end positions E of the imaging areas XU1 to XU4 as shown in FIG. 5, and the imaging area XU1 as shown in FIG. To the imaging center position alignment unit 28 for aligning the imaging center positions C of XU4. These imaging area coupling unit 25, imaging start position alignment unit 26, imaging end position alignment unit 27, and imaging center position alignment unit 28. However, it can be selected and operated by an input operation using the mouse 14B or the like.
[0033]
In the case of the imaging area connecting unit 25, the imaging areas XU1 to XU4 are automatically connected at the start of operation, but the imaging start position aligning unit 26, the imaging end position aligning unit 27, and the imaging center position are configured. In the case of the aligning unit 28, the position is not automatically aligned at the start of operation, but is clicked when, for example, the imaging start position B, the imaging end position E, or the imaging center position C of the imaging area XU1 is clicked with the mouse 14B. In other words, the imaging start position B, the imaging end position E, or the imaging center position C of another imaging area is aligned at the same position.
[0034]
In addition, as shown in FIG. 7, the X-ray CT apparatus according to the embodiment superimposes a plurality of (for example, four) imaging areas (for example, four imaging areas XU1) on the screen of the display monitor 22. The same imaging area superimposing part 29 to display is provided. In FIG. 7, for convenience of explanation, the respective imaging areas (four imaging areas XU1) are slightly shifted so that the imaging areas (four imaging areas XU1) are overlapped. ing. The same imaging area superimposing unit 29 is an X-ray CT imaging region in the case of performing a phase imaging inspection mode in which the same imaging region is inspected a plurality of times, for example, imaging is repeated before and after angiographic contrast agent administration. Used for configuration. The setting of the X-ray CT imaging region when performing the phase imaging inspection mode, that is, the setting of a plurality of (for example, four) imaging areas is created in advance as a preset condition by the operator and registered in the database. The imaging areas are displayed in a superimposed state from the start of the operation of the same imaging area superimposing unit 29.
[0035]
In addition, in the X-ray CT apparatus of the embodiment, in response to an input operation by clicking the mouse 14B, the imaging region setting unit 24 changes the size of the imaging areas XU1 to XU4 as shown in FIG. 8 (FIG. 8). Then, the size of the imaging areas XU1 to XU4 is enlarged from the size indicated by the two-dot chain line to the size indicated by the solid line.) Alternatively, as shown in FIG. 9, the angle θ of the imaging areas XU1 to XU4 is changed. In FIG. 9, the angle of the imaging areas XU1 to XU4 is changed so as to be inclined from the direction indicated by the two-dot chain line to the direction indicated by the solid line. When the size of the imaging areas XU1 to XU4 changes, the size of the slice cross section changes, and when the angle θ of the imaging areas XU1 to XU4 changes, the gantry (not shown) changes and the slice cross section with respect to the body axis Z of the subject M (For example, an angle with an axis orthogonal to the body axis Z of the subject M as a reference (0 °)) is changed. In other words, changing the angle θ of the imaging areas XU1 to XU4 changes the tilt angle of the gantry during imaging.
[0036]
Further, as shown in FIG. 1, the X-ray CT apparatus of the embodiment, when a specific imaging area is adjusted, from other imaging areas correlated with the specific imaging area, that is, the specific imaging area. In addition, an imaging area automatic follow-up unit 30 that automatically performs the same adjustment as described above to follow the adjustment of a specific imaging area is provided for an imaging area whose imaging order is later (following). That is, when the imaging area connecting unit 25 is in operation, when the position of a specific imaging area (for example, the imaging area XU2) is changed by adjustment on the screen of the display monitor 22 by the imaging area setting unit 24, The imaging area auto-tracking unit 30 has no change in the imaging area (in this case, the imaging area XU1) that is more advanced than the specific imaging area (in this case, the imaging area XU2). The imaging area coupling unit 25 is instructed to automatically change to a position where only subsequent imaging areas (in this case, imaging areas XU3 and XU4) are connected after a specific imaging area (in this case, imaging area XU2). . The “correlation” referred to here means “the imaging order of the imaging area” as described above.
[0037]
When any one of the imaging start position alignment unit 26, the imaging end position alignment unit 27, and the imaging center position alignment unit 28 is in operation, the imaging area setting unit 24 causes the display monitor 22 to display the screen. When one of the imaging start position B, the imaging end position E, and the imaging center position C of a specific imaging area (for example, the imaging area XU2) is changed by the selection operation, the imaging area automatic tracking unit 30 performs the specific imaging. The imaging area (in this case, the imaging area XU1) that is more advanced than the area (in this case, the imaging area XU2) (in this case, the imaging area XU1) is not changed, and the subsequent imaging area (in this case, the imaging area XU3) The corresponding positions of the imaging start position B, the imaging end position E, and the imaging center position C for only XU4) are automatically aligned with the changed position of the specific imaging area (for example, the imaging area XU2). The way, imaging start alignment unit 26, imaging end alignment unit 27, and instructs the corresponding means of the image pickup center alignment unit 28.
[0038]
Further, when the same imaging area superimposing unit 29 is in operation, if the imaging area setting unit 24 adjusts a specific imaging area (for example, the imaging area XU2) (for example, changes the size of the imaging area), the imaging area The automatic follower 30 has no change in the imaging area (in this case, the imaging area XU1) that is more advanced than the specific imaging area (in this case, the imaging area XU2). The same adjustment (in this case, the same adjustment as the size change of the imaging section XU2) is automatically performed only on the imaging area (in this case, the imaging areas XU3 and XU4).
[0039]
Subsequently, referring to the drawing, the progress process when setting the X-ray CT imaging region XU composed of four imaging areas (XU1 to XU4) on the head of the subject M in the embodiment apparatus having the above-described configuration is described. While explaining. FIGS. 10A to 10E are schematic diagrams showing the progress of setting of the X-ray CT imaging region by the embodiment apparatus, and FIG. 11 is a flowchart showing the progress of setting of the X-ray CT imaging region by the embodiment apparatus. is there.
[0040]
In the following, the top plate 5 on which the subject M is placed is moved to set the subject M to the imaging start position, and the transmission X-ray image CR of the positioning image has been acquired, and the obtained transmission X-ray image CR is obtained. And the box cursors XB1 to XB4 indicating the imaging areas XU1 to XU4 are displayed on the screen of the display monitor 22, and the imaging area coupling unit 25 and the imaging area automatic tracking unit 30 are started (FIG. 10A). Reference). In FIGS. 10A to 10E, for convenience of explanation, there is a slight gap between adjacent areas of the imaging areas XU1 to XU4 in a connected state. Are continuous with no gap between adjacent areas of the imaging areas XU1 to XU4 in a connected state.
[0041]
[Step S1] For example, the operator manually operates the imaging area XU1 shown in FIG. 10A with the mouse 14B (for example, a drag operation) and manually moves it to the upper fitting position as shown in FIG. 10B. . Thus, the position of the imaging area XU1 is determined.
[0042]
[Step S2] As shown in FIG. 10C, the imaging area automatic follower 30 moves the subsequent imaging areas XU2 to XU4 after the imaging area XU1 to automatically connect them. To instruct. Since the suitable position of the imaging area XU2 is a position that follows the imaging area XU1, the position of the imaging area XU2 is determined as it is. Moreover, since the suitable position of the imaging area XU3 is a position that follows the imaging area XU2, the position of the imaging area XU3 is determined as it is. Moreover, since the suitable position of the imaging area XU4 is a position that follows the imaging area XU3, the position of the imaging area XU4 is determined as it is. In this way, by simply changing the position of the imaging area XU1, the subsequent imaging areas XU2 to XU4 are automatically changed to positions following this imaging area XU1.
[0043]
[Step S3] Further, for example, the operator operates the imaging area XU3 shown in FIG. 10C with the mouse 14B (for example, drag operation), and fits in the approximate center near the rear side as shown in FIG. 10D. Suppose you manually move it to a position. Thus, the position of the imaging area XU3 is also determined.
[0044]
[Step S4] As shown in FIG. 10E, the imaging area automatic follower 30 causes the imaging area coupling unit 25 to move only the subsequent imaging area XU4 after the imaging area XU3 and automatically connect the imaging area XU4. Instruct. Since the suitable position of the imaging area XU4 is a position that follows the imaging area XU3, the position of the imaging area XU4 is determined as it is.
In this way, simply by changing the position of the imaging area XU3, the subsequent imaging area XU4 is automatically changed to a position following the imaging area XU3.
[0045]
[Step S5] When the positions of the four imaging areas XU1 to XU4 are all determined, the setting of the X-ray CT imaging region XU is completed.
[0046]
As described in detail above, according to the X-ray CT apparatus of the embodiment, when the position of a specific imaging area is changed by adjustment by the imaging area automatic tracking unit 30, the position of the subsequent imaging area is changed to the specific imaging area. Therefore, conventionally, it is necessary to individually change the position of each of a plurality of imaging areas (for example, four imaging areas XU1 to XU4). However, since the position is changed so that the subsequent imaging areas XU2 to XU4 follow only by performing an operation of changing the position of the imaging area XU1 whose imaging order is the top, a plurality of imaging areas ( For example, an X-ray CT imaging region XU composed of four imaging areas XU1 to XU4) can be quickly set.
[0047]
In the description using FIG. 10 and FIG. 11 described above, when the position of the specific imaging area is changed, the specific imaging is performed with respect to the position of the imaging area whose imaging order is later than the specific imaging area. The progress process in which the X-ray CT imaging region XU is quickly set by automatically changing the position so that the same adjustment (position change) as the area follows the specific imaging area is described. By changing the size and angle of the imaging area instead of changing the position, the automatic tracking adjustment similar to that described above can be performed for the size and angle of the imaging area.
[0048]
Further, the input operation when setting the X-ray CT imaging region will be described more specifically. When the X-ray CT imaging region is set, as shown in FIG. 12, the plan mode screen is called up on the screen of the display monitor 22, and the screen switch for input operation (automatic adjustment selection switch SW1, cursor type group selection switch SW2 on the left side) Etc.) and the transmission X-ray image CR and the box cursors XB1 to XB4 are displayed on the right side. The operator clicks the automatic adjustment selection switch SW1 with the mouse 14B to select one of the imaging area connecting unit 25, the imaging start position aligning unit 26, the imaging end position aligning unit 27, and the imaging center position aligning unit 28. Can be operated.
[0049]
For example, in order to set the X-ray CT imaging region when performing the phase imaging inspection mode in which the same imaging region is imaged a plurality of times, the automatic adjustment selection switch SW1 is operated to set the imaging start position aligning unit 26, the imaging end position A desired one of the aligning unit 27 and the imaging center position aligning unit 28 may be selected. For example, it is assumed that the automatic adjustment selection switch SW1 is clicked with the mouse 14B and the imaging start position aligning unit 26 is selected and operated. On the screen of the display monitor 22, four box cursors XB1 to XB4 corresponding to a plurality of imaging areas (for example, four imaging areas XU1) are overlapped with the transmission X-ray image CR. Is displayed. If the second box cursor XB2 is selected and its position is changed, automatic tracking adjustment is performed so that the imaging start position B of the third and subsequent box cursors XB3 and XB4 is aligned with the imaging start position B of the second box cursor XB2. Is done. Even when the imaging end position aligning unit 27 or the imaging center position aligning unit 28 is selected, automatic follow-up adjustment is performed so as to align at the imaging end position and the imaging center position as described above.
[0050]
Further, when the automatic adjustment selection switch SW1 is selected as the “inter-group continuous mode”, the imaging area connecting unit 25 is selected and operated, and the imaging areas XU1 to XU4 are made continuous as in the above-described embodiment. Can be adjusted to be connected. Further, when the automatic adjustment selection switch SW1 is selected in the “inter-group free mode”, each of the imaging areas XU1 to XU4 can be adjusted freely independently of the other imaging areas. Further, the imaging area XU1 to XU4 to be adjusted can be selected by clicking the cursor group selection switch SW2 with the mouse 14B, and the imaging area XU1 to XU4 to be adjusted can also be selected by clicking the box cursors XB1 to XB4. Can be selected.
[0051]
Further, when the FOV (field of view) adjustment control switch SW3 is clicked with the mouse 14B to select the “following” mode, and the specific imaging area is changed to an arbitrary size with the mouse 14B, the imaging area automatic follow-up unit 30 Adjustment similar to the above is automatically performed so as to follow the change in the size of the specific imaging area only for the imaging area subsequent to the specific imaging area. When the FOV (field of view) adjustment control switch SW3 is clicked with the mouse 14B to select the “all” mode, and the specific imaging area is changed to an arbitrary size by the mouse 14B, the imaging area automatic follower 30 automatically Follow-up adjustments are expanded to all imaging areas, including advanced imaging areas as well as subsequent imaging areas, and all imaging areas are automatically sized as well as specific imaging area changes. To adjust. In addition, when the FOV (field of view) adjustment control switch SW3 is clicked with the mouse 14B to select the “none” mode, and the specific imaging area is changed to an arbitrary size with the mouse 14B, automatic tracking adjustment is not performed at all. Only a specific imaging area is adjusted.
[0052]
When the tilt adjustment control switch SW4 is clicked with the mouse 14B to select the “following” mode and the specific imaging area is changed to an arbitrary angle (slice angle) with the mouse 14B, the imaging area automatic follower 30 Adjustment (angle change) similar to the above is automatically performed so as to follow the angle change of the specific imaging area only for the imaging area subsequent to the specific imaging area. In addition, when the tilt adjustment control switch SW4 is clicked with the mouse 14B to select the “all” mode, and the specific imaging area is changed to an arbitrary angle with the mouse 14B, the imaging area automatic tracking unit 30 is followed by the automatic tracking adjustment. In addition to the imaging area, the imaging area is expanded to the entire imaging area including the advanced imaging area, and the angles of all the imaging areas are automatically adjusted in the same manner as the angle change of the specific imaging area. Further, when the tilt adjustment control switch SW4 is clicked with the mouse 14B to select the “none” mode, and the specific imaging area is changed to an arbitrary angle by the mouse 14B, automatic tracking adjustment is not performed at all, and the specific imaging area Only become adjusted.
[0053]
In the case of the X-ray CT apparatus of the embodiment, the operation monitor 15 mainly registers the preset conditions in advance, inputs the patient information, specifies the imaging region, and calls and specifies the registered preset conditions. This is used when performing an input operation by a screen touch or the like.
[0054]
The present invention is not limited to the above-described embodiment, and can be modified as follows.
(1) In the embodiment described above, the position, size, and angle of the box cursor indicating the imaging area are changed by operating the mouse. However, the box cursor indicating the imaging area is operated by other input means such as a console. The position, size, and angle of the image may be changed.
[0055]
(2) In the above-described embodiment, by adjusting the box cursor indicating a specific imaging area (adjustment that changes the position, size, and angle of the imaging area), other imaging that is correlated with the specific imaging area The automatic tracking adjustment is performed for the area so that the same adjustment as the specific imaging area is performed, but the adjustment of the imaging area can be performed by adjustments other than the box cursor, such as adjusting the specific imaging area by numerical input. You may make it.
[0056]
(3) In the above-described embodiment, as another imaging area having a correlation with a specific imaging area, an imaging area whose imaging order is later than the specific imaging area has been described as an example. We have explained the case where “Relation” is set to “Sequence of imaging of imaging area”, but this “Correlation” is not “Sequence of imaging of imaging area”, but the one described below (“ Arbitrary arrangements such as “order of arrangement”, “order of size of imaging areas”), etc. may be arbitrarily determined so that a specific imaging area and other imaging areas have a correlation. For example, “correlation” is set to “order of arrangement of the imaging areas”, that is, the order of arrangement of the imaging areas displayed on the screen of the display monitor 22 (for example, left to right, right to left, top Order from bottom to top, bottom to top, etc.) ”. Specifically, in the case of the arrangement order of the imaging areas (from left to right), the imaging area located on the leftmost is the top, and the imaging area located on the right side is numbered in the order from the right ( Numbering). In addition, the “correlation” is set to “the order of the size of the imaging areas”, that is, the order of the sizes of the imaging areas displayed on the screen of the display monitor 22 (for example, from large to small, The order from small to large)).
Specifically, when the order of the size of the imaging areas (from large to small) is set, the largest imaging area is the top, and numbering (numbering) is performed in order of decreasing size. is there. These “correlations” as described above are provided in the imaging area automatic tracking means.
[0057]
【The invention's effect】
As described in detail above, according to the X-ray CT apparatus of the first aspect of the invention, when a specific imaging area is adjusted, a specific imaging area is correlated with the specific imaging area. It is equipped with a configuration that automatically performs adjustment similar to the imaging area to follow the adjustment of the specific imaging area, so it is not necessary to adjust each imaging area individually, and the specific imaging area is adjusted It is possible to automatically adjust other imaging areas correlated with this specific imaging area so as to follow the adjustment of the specific imaging area. The CT imaging area can be set quickly.
[0058]
According to the X-ray CT apparatus of the second aspect of the invention, when the specific imaging area is adjusted, the adjustment similar to the specific imaging area is performed on the subsequent imaging area following the adjustment of the specific imaging area. Since it is configured automatically, the subsequent imaging area can be adjusted smoothly, and automatic tracking adjustment similar to the adjustment of a specific imaging area is advanced only for the subsequent imaging area. Therefore, the adjustment that has already been performed for the advanced imaging area is not disturbed by the automatic tracking adjustment for the subsequent imaging area, and as a result, the setting of the X-ray CT imaging area can be quickly performed. Can be done.
[0059]
According to the X-ray CT apparatus of the third aspect of the present invention, the imaging area connecting means for connecting the imaging areas in the order of imaging is provided, and the imaging area automatic follow-up means changes the position of the specific imaging area by adjustment. Then, since the imaging area connecting means is instructed to automatically change the position of the subsequent imaging area to a position connected after the specific imaging area, the X-ray CT imaging region setting operation is easy.
[0060]
According to the X-ray CT apparatus of the invention of claim 4, Indicates X-ray CT imaging area specific Imaging When adjustment of the size or angle of the area is performed, the corresponding size similar to the above to follow the adjustment of the specific imaging area for the imaging area whose imaging order is later than the specific imaging area. Since the imaging area automatic tracking means for automatically adjusting the height or angle is provided, when the size of the specific imaging area (size of the slice cross section at the time of imaging) or the angle (slice angle) is adjusted A corresponding size or angle adjustment of an imaging area that is later in imaging order than a specific imaging area is automatically made to follow the adjustment of the specific imaging area, It is possible to quickly and easily set the X-ray CT imaging region for adjusting the angle.
[0061]
According to the X-ray CT apparatus of the fifth aspect of the present invention, when a specific imaging area in the imaging area in which a plurality of identical imaging areas are overlapped is adjusted, the specific imaging area is followed. Since there is an imaging area automatic follow-up means that automatically follows the same adjustment as described above only for the imaging area, it is the same for inspecting the same imaging region multiple times (phase imaging inspection mode). Even in the case where an X-ray CT imaging region in which a plurality of imaging areas are overlapped is set, the imaging order is later than a specific imaging area in the overlapped imaging areas. The adjustment of the imaging area can be automatically performed in the same manner as the adjustment of the specific imaging area, the X-ray CT imaging area can be set quickly, and the degree of freedom in setting the X-ray CT imaging area is improved. be able to.
[0062]
According to the X-ray CT apparatus of the sixth aspect of the present invention, when one of the imaging start position, the imaging end position, and the imaging center position of a specific imaging area is changed by adjustment, the imaging area is automatically According to the instruction from the follow-up means, the corresponding imaging start position, imaging end position, and imaging center position of the subsequent imaging area can be automatically aligned with the changed position of the specific imaging area. Easy setting operation.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating an overall configuration of an X-ray CT apparatus according to an embodiment.
FIG. 2 is a schematic view showing a screen of a display monitor during X-ray CT imaging region setting in the embodiment apparatus.
FIG. 3 is a schematic diagram showing a connection state of imaging areas for setting an X-ray CT imaging region.
FIG. 4 is a schematic diagram showing a state in which the imaging start positions of the imaging area for setting the X-ray CT imaging region are aligned.
FIG. 5 is a schematic diagram showing a state where the imaging end positions of the imaging area for setting the X-ray CT imaging region are aligned.
FIG. 6 is a schematic diagram showing a state in which the imaging center positions of the imaging area for setting the X-ray CT imaging region are aligned.
FIG. 7 is a schematic diagram showing a state in which the same imaging areas for setting an X-ray CT imaging region are overlapped.
FIG. 8 is a schematic diagram showing a state in which the size of an imaging area for setting an X-ray CT imaging region is changed.
FIG. 9 is a schematic diagram showing a state in which an angle of an imaging area for setting an X-ray CT imaging region is changed.
FIGS. 10A to 10E are schematic views showing the progress of setting of an X-ray CT imaging region by the embodiment apparatus.
FIG. 11 is a flowchart showing a progress of setting of an X-ray CT imaging region by the embodiment apparatus.
FIG. 12 is a detail view showing a plan mode screen in the display monitor of the embodiment apparatus;
FIG. 13 is a schematic diagram showing an X-ray imaging mechanism of a conventional X-ray CT apparatus.
FIG. 14 is a schematic view showing a screen of a display monitor during setting of an X-ray CT imaging region in a conventional apparatus.
[Explanation of symbols]
3 ... X-ray imaging mechanism
17 Data processing part
22 ... Display monitor
23 ... Imaging area display controller
24 ... Shooting area setting section
25 ... Imaging area connection part
26: Imaging start position aligning unit
27: Imaging end position aligning section
28: Imaging center position aligning section
29 ... Same imaging area overlapping part
30 ... Imaging area automatic tracking unit
M… Subject
CR ... Transmission X-ray image (positioning image)
XB1 to XB4 ... Box cursor
XU1 to XU4 ... Imaging area
XU ... X-ray CT imaging area

Claims (6)

The subject positioning image and the respective imaging conditions are set for each area, and within the same area, an imaging area where one or more slices are captured under the same imaging condition is displayed on the screen of the display means simultaneously. An imaging area display control means, an imaging area setting means for setting an X-ray CT imaging area comprising a plurality of imaging areas by adjusting an imaging area displayed on the screen of the display means on the screen; X-ray CT provided with X-ray imaging means that obtains X-ray CT image creation data by performing slice imaging for each imaging area of the X-ray CT imaging area set by the imaging area setting means in a predetermined order In the device
(A) the screen image pickup area on the display means is displayed in the form of box cursor, the the imaging area setting means is Gana adjusted for a particular imaging area by changing the box cursor, the particular imaging area X-ray CT comprising an imaging area automatic follow-up means that automatically performs the same adjustment as described above for other imaging areas that are correlated with each other so as to follow the adjustment of a specific imaging area apparatus. The subject positioning image and the respective imaging conditions are set for each area, and within the same area, an imaging area where one or more slices are captured under the same imaging condition is displayed on the screen of the display means simultaneously. An imaging area display control means, an imaging area setting means for setting an X-ray CT imaging area comprising a plurality of imaging areas by adjusting an imaging area displayed on the screen of the display means on the screen; X-ray CT provided with X-ray imaging means that obtains X-ray CT image creation data by performing slice imaging for each imaging area of the X-ray CT imaging area set by the imaging area setting means in a predetermined order In the device
(A1) When a specific imaging area is adjusted by the imaging area setting means, the same adjustment as described above is followed to the adjustment of the specific imaging area for other imaging areas correlated with the specific imaging area. It has an imaging area automatic tracking means that automatically performs
When the specific imaging area is adjusted by the imaging area setting unit, the imaging area automatic follow-up unit is configured to specify a specific imaging area for an imaging area whose imaging order is later than the specific imaging area as the correlation. An X-ray CT apparatus configured to automatically perform the same adjustment as described above so as to follow the adjustment of an imaging area. 3. The X-ray CT apparatus according to claim 1, further comprising an imaging area coupling unit that couples imaging areas on a screen of the display unit in an imaging order, wherein the imaging area automatic tracking unit includes the imaging area automatic tracking unit. When the position of a specific imaging area is changed by adjustment on the screen of the display means, the position of the imaging area whose imaging order is later than that specific imaging area is connected after the specific imaging area An X-ray CT apparatus which instructs the imaging area connecting means to automatically change the order of imaging. 3. The X-ray CT apparatus according to claim 1, wherein the imaging area automatic tracking unit adjusts a size or an angle of a specific imaging area indicating an X-ray CT imaging area on a screen of the display unit. When performed, for an imaging area whose imaging order is later than the specific imaging area as the correlation, a corresponding size or angle similar to the above to follow the adjustment of the specific imaging area An X-ray CT apparatus configured to perform adjustment automatically. 3. The X-ray CT apparatus according to claim 1, further comprising a same imaging area superimposing unit that superimposes and displays a plurality of the same imaging area on the screen of the display unit, and automatically follows the imaging area. When the adjustment of a specific imaging area among a plurality of imaging areas displayed in a superimposed manner on the screen of the display means is performed, the imaging order is higher than the specific imaging area as the correlation. An X-ray CT apparatus configured to automatically perform the same adjustment as described above for an imaging area later. 6. The X-ray CT apparatus according to claim 1, wherein an imaging start position aligning unit that aligns an imaging start position of an imaging area on the screen of the display unit and an imaging end of the imaging area on the screen of the display unit. The image pickup end position aligning means for aligning the position and the image pickup center position aligning means for aligning the image pickup center position of the image pickup area on the screen of the display means are selected and operated, When one of the imaging start position, the imaging end position, and the imaging center position of the specific imaging area is changed by the selection operation on the screen of the display unit, the imaging area automatic follow-up unit starts from the specific imaging area. In addition, the corresponding positions of the imaging start position, the imaging end position, and the imaging center position for the imaging area whose imaging order is later can be automatically aligned with the changed position of the specific imaging area. Sea urchin, X-rays CT apparatus characterized by instructing the corresponding means of the and the imaging start position aligning means and the imaging end alignment means and the image pickup center alignment means.

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