JP4448654B2 - X-ray CT system, operation console thereof, and control method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an X-ray CT (Computerized Tomography) system that obtains an X-ray tomographic image of a subject by X-ray irradiation, an operation console thereof, and a control method thereof.
[0002]
[Prior art]
The X-ray CT system scans a patient (subject) by irradiating X-rays from a plurality of directions, and performs image reconstruction processing based on projection data obtained from the X-rays transmitted from the directions through the patient. It provides a tomographic image of a diagnostic site. A tomogram of a patient is very useful clinically, and in recent years, a mass examination by an X-ray CT system has also been performed.
[0003]
When performing mass screening, it is desirable to improve patient throughput. For this purpose, it is preferable that various screenings can be performed only by scanning a predetermined range of each patient at once without adding a breathing time or the like. In view of such demands, current X-ray CT systems generally divide a patient's scan range into a plurality of groups, and each group can perform a scan plan suitable for the diagnostic purpose of the group. Yes. As a conventional example related to the scan planning technique, there is, for example, Patent Document 1 described later.
[0004]
By the way, the recent X-ray CT system has a function of providing a tomographic image while avoiding deterioration of image quality due to a change in shape of a portion whose shape changes due to the influence of a periodic physiological motion such as heartbeat or respiration. Many are equipped. A typical example is a so-called ECG-synchronized scan. This electrocardiogram-synchronized scan is to collect projection data of the same phase in the heartbeat cycle by performing a scan synchronized with the heartbeat cycle for a heart that periodically repeats contraction-relaxation. When an electrocardiogram-synchronized scan is performed, only projection data related to a specific period of heartbeat (for example, a systole of the heart) can be arranged as much as necessary for one image reconstruction, and artifacts due to heartbeat movement can be eliminated. As a result, a clear tomographic image can be obtained, which has many clinical advantages. In particular, it is possible to clearly capture calcifications that are not visible in normal X-ray examinations.
[0005]
[Patent Document 1]
JP-A-2001-212137 [0006]
[Problems to be solved by the invention]
As described above, it is preferable that various screenings can be performed only by performing a scan performed on a predetermined range of each patient at a time without inserting a breathing time. For example, it is advantageous to be able to perform both lung field diagnosis and cardiac diagnosis based on a single scan result.
[0007]
However, in the conventional X-ray CT system, for example, when an electrocardiogram-synchronized scan is selected for the diagnosis of the heart, only the scan plan for the diagnosis of the heart is performed for the entire set scan range. I could not. After all, if you want to perform both lung field diagnosis and heart diagnosis for one patient, for example, scan for lung field diagnosis and scan for heart diagnosis are performed separately. Inevitably, there was a problem that inspection efficiency was poor.
[0008]
Therefore, an object of the present invention is to make it possible to perform a plurality of types of screening including a diagnosis of the heart from scan results performed at a time, thereby improving examination efficiency.
[0009]
[Means for Solving the Problems]
One aspect of the present invention relates to an X-ray CT system that performs scanning to collect projection data by irradiating a subject with X-rays from a plurality of directions, and provides a tomographic image of the subject, based on the input projection data. Reconstruction means for reconstructing a tomogram, and projection data required for reconstruction of one tomogram from the collected projection data, and a first reconstruction process based on the extracted projection data, or a collected projection Projection data required for reconstruction of one tomographic image in a specific period of the periodic physiological movement of the subject is extracted from the data, and at least one of the second reconstruction processing based on the extracted projection data is performed as the reconstruction. Control means for controlling the means to perform, and setting means for setting conditions relating to scan and tomographic image reconstruction in advance, wherein the setting means performs a first reconstruction process. Means for specifying the interval, characterized in that the second section included in the first section and means for designating as the section to perform the second reconstruction processing.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments will be described in detail with reference to the drawings.
[0011]
FIG. 1 is a diagram illustrating a configuration of an X-ray CT system according to an embodiment. As shown in the figure, the present system performs various operation settings for the gantry 100 for detecting X-ray irradiation to the subject and X-rays transmitted through the subject, and is transferred from the gantry 100. The operation console 200 is configured to reconstruct and output (display) an X-ray tomogram based on the acquired data.
[0012]
The gantry 100 includes the following configuration including the main controller 1 that controls the entire system.
[0013]
2a and 2b are interfaces for communicating with the operation console 200, and 3 is a subject (patient) lying on the table 11 in a direction perpendicular to the drawing (hereinafter, this direction is referred to as the z-axis. The gantry rotating unit has a cavity for transporting in the direction of the axis), and an X-ray tube 4 serving as an X-ray generation source and an opening for limiting the X-ray irradiation range are provided therein. The collimator 6 has an opening control motor 7 for adjusting the opening width of the collimator 6 in the z-axis direction. Driving of the X-ray tube 4 is controlled by an X-ray tube controller 5, and driving of the aperture control motor 7 is controlled by an aperture control motor driver 8. The X-rays that have passed through the collimator 6 form a fan-shaped X-ray beam along the rotation direction of the gantry rotating unit 3 due to the limitation of the X-ray irradiation range by the collimator 6. Such an X-ray beam is also called a fan beam. The radiation angle of this fan is called the fan angle and is generally about 60 °.
[0014]
The gantry rotating unit 3 has a plurality of (eg, 1,000) lengths depending on the fan angle for detecting X-rays from the X-ray tube 4 passing through the collimator 6 and the cavity. An X-ray detection unit 14 having a detection channel and a data collection unit 15 that collects the output of each detection channel of the X-ray detection unit 14 as projection data are also provided. The X-ray tube 4 and the collimator 6 and the X-ray detection unit 14 are provided at positions facing each other with the cavity therebetween, that is, with the subject interposed therebetween, and around the cavity with the relationship maintained. Is configured to rotate. This rotation is performed by the rotary motor 9 driven by a drive signal from the rotary motor driver 10. The table 11 on which the subject is placed is transported in the z-axis direction, and is driven by the table motor 12 driven by a drive signal from the table motor driver 13.
[0015]
The main controller 1 analyzes various commands received via the interface 2a, and based on the analysis, the X-ray tube controller 5, the aperture control motor driver 8, the rotary motor driver 10, the table motor driver 13, and the data collecting unit. 15, various control signals are output.
[0016]
The data collected by the data collection unit 15 is sent to the operation console 200 via the interface 2b.
[0017]
On the other hand, the operation console 200 is a so-called workstation, and as shown in the figure, the CPU 51 that controls the entire apparatus, the ROM 52 that stores the boot program, the RAM 53 that functions as the main storage device, and the following configuration are included. Prepare.
[0018]
The HDD 54 is a hard disk device. In addition to the OS, the HDD 54 has an image processing program for giving various instructions to the gantry 100 and reconstructing and displaying an X-ray tomogram based on data received from the gantry 100. Stored. The VRAM 55 is a memory for developing image data to be displayed, and can be displayed on the CRT 56 by developing the image data or the like here. Reference numerals 57 and 58 denote a keyboard and a mouse for performing various settings. Reference numerals 59 and 60 are interfaces for communicating with the gantry 100, and are connected to the interfaces 2a and 2b of the gantry 100, respectively.
[0019]
The operation console is connected to an electrocardiograph 300 that converts the heartbeat motion of the subject into an electrical signal. This is used for an electrocardiogram synchronous scan described later.
[0020]
The configuration of the X-ray CT system in the present embodiment is generally as described above. In the X-ray CT system having such a configuration, the projection data is collected as follows.
[0021]
First, with the subject positioned in the cavity of the gantry rotating unit 3, the position in the z-axis direction is fixed, and the subject is irradiated with the X-ray beam from the X-ray tube 4 (X-ray projection). The transmitted X-ray is detected by the X-ray detector 14. The transmitted X-ray is detected by rotating the X-ray tube 4 and the X-ray detection unit 14 around the subject (that is, changing the projection angle (view angle)) to a plurality of N (for example, N = 1,000) view direction, 360 °. Each detected transmission X-ray is converted into a digital value by the data acquisition unit 15 and transferred to the operation console 200 via the interface 2b as projection data. A series of these processes is called one scan as one unit. Then, the scan position is sequentially moved by a predetermined amount in the z-axis direction, and the next scan is performed. Such a scanning method is called an axial scanning method, but the table 11 is moved at a predetermined speed in synchronization with the change in the projection angle while moving the scanning position (the X-ray tube 4 and the X-ray detection unit 14). So that a so-called helical scan can be performed to collect projection data. The operation console 200 reconstructs a tomographic image by a predetermined arithmetic operation based on the transferred projection data, and displays and outputs it on the CRT 56.
[0022]
In general, a tomographic image is reconstructed from collected projection data for 360 °. However, it is known that a tomographic image can be reconstructed if projection data for a minimum of 180 ° + fan angle is prepared. Using this, a full scan mode that assumes reconstruction from projection data for 360 ° and a half scan mode that assumes reconstruction from projection data for 180 ° + fan angle are prepared. The user can select arbitrarily. The full scan mode can reconstruct a high-quality tomogram, and the half scan mode can increase the scan speed instead of sacrificing the image quality of the tomogram slightly. There is an advantage that the exposure dose to the specimen can be reduced.
[0023]
Further, the X-ray CT system in the embodiment has a so-called electrocardiographic synchronization function. The scanning and image reconstruction processing by this electrocardiographic synchronization function is generally as follows. First, the heartbeat waveform of the subject is input using the electrocardiograph 300, and the heartbeat cycle is measured. Thereafter, the scan is executed with the rotation speed of the gantry rotating unit 3 set to a speed that rotates, for example, 360 ° + α in one cycle of the heartbeat. According to this scan, the initial projection angle of the gantry rotating unit 3 advances by α every cycle of the heartbeat. Thereby, from the collected projection data, projection data required for reconstruction of one tomographic image in a specific period (for example, the systole of the heart) of the subject's heartbeat motion (360 ° projection data, half in the full scan mode) In the scan mode, 180 ° + fan angle projection data) is extracted. Specifically, image reconstruction is performed based on the extracted projection data. When such reconstruction processing is performed, a clear tomographic image can be obtained without causing artifacts due to heartbeat motion.
[0024]
Now, let us assume a case where a mass examination is performed using the above-described X-ray CT system. In this case, as described above, it is preferable that various screenings can be performed only by performing a scan performed on a predetermined range of each patient at once without adding a breathing time or the like. For example, it is advantageous to be able to perform both lung field diagnosis and cardiac diagnosis based on a single scan result.
[0025]
However, in the conventional X-ray CT system, when an electrocardiogram-gated scan is selected for diagnosing the heart, only the scan plan for diagnosing the heart is performed for the entire set scan range. I could not. After all, if you want to perform both lung field diagnosis and heart diagnosis for one patient, for example, scan for lung field diagnosis and scan for heart diagnosis are performed separately. Inevitably, there was a problem that inspection efficiency was poor.
[0026]
Therefore, in the present embodiment, in the scan planning step, a step of designating a first section for performing normal reconstruction processing (first reconstruction processing), and a second section included in the first section. Is included as a section for performing the reconfiguration process (second reconfiguration process) by the electrocardiogram synchronization function, so that only the second section that is a part of the first section set initially is included. A scan plan for the diagnosis of the heart can be performed on the subject. Hereinafter, this implementation example will be described in detail.
[0027]
FIG. 2 is a flowchart showing the contents of the scan planning process in the embodiment. A program corresponding to this flowchart is included in the image processing program stored in the hard disk 54 of the operation console 200, loaded into the RAM 53, and executed by the CPU 51.
[0028]
In this processing example, a scan plan for performing a helical scan on a lung field region for the purpose of lung field diagnosis and heart diagnosis is performed. Of course, it is possible to make a scan plan for the purpose of diagnosing other parts, but here, for the sake of simplicity of explanation, description will be made only for those intended for lung field diagnosis and heart diagnosis.
[0029]
First, a scout scan is executed (step S1). In the scout scan, the X-ray tube 4 is fixed at a predetermined position (that is, fixed at a fixed projection angle without rotating the gantry 3), and the table 11 on which the subject is placed is gradually conveyed. One subject fluoroscopic image is obtained from projection data (fluoroscopic image data) obtained by continuously irradiating X-rays. The fluoroscopic image of the subject thus obtained is called a scout image.
[0030]
After the power is turned on, an initial screen as shown in FIG. The scout scan can be planned and executed using the scout scan setting screen shown in FIG. 4 displayed in the image area 23 by clicking the “Scout scan” button 21 with the mouse 58. On the scout scan setting screen of FIG. 4, the start position and end position of the scout scan with respect to a predetermined reference position, the tube voltage and the tube current applied to the X-ray tube 4 can be set. Thereafter, a scout scan execution command is sent to the gantry 100 by clicking the start button 32 for executing the scout scan.
[0031]
The gantry 100 receives the execution command for the scout scan and performs the scout scan according to the above-described plan contents. The operation console 200 receives the fluoroscopic image data transferred from the gantry 100 and stores it in the RAM 53 (step S2).
[0032]
In the next step S3 and thereafter, conditions for scanning and image reconstruction are actually set as a scan plan. Here, when the “scan” button 22 in FIG. 3 is clicked, a scan plan screen as shown in FIG. 5 is displayed in the image area 23. In the scan plan screen of FIG. 5, a scout image is displayed in 40 areas. Reference numeral 41 denotes a scan start position setting field, and reference numeral 42 denotes a scan end position setting field. A section between the scan start position and the scan end position is a scan section. For the purpose of lung field diagnosis and heart diagnosis, a scan section covering the lung field is set (step S3). The scan section can be set by operating the mouse 58 on the scout image display area 40. 61 is a line indicating the scan start position set by the operation, and 62 is a line indicating the scan end position. In the scan start position setting field 41 and the scan end position setting field 42, positions corresponding to 61 and 62 are displayed numerically. Of course, it is also possible to modify the numerical values in each column. 43 is a slice thickness setting column.
[0033]
44 is a column for selecting ON / OFF of the electrocardiogram synchronization function, and step S4 selects either ON / OFF of this column. Conventionally, it was only possible to select ON / OFF of the ECG synchronization function for the entire scan section set as described above, but here, when the ECG synchronization function is turned ON, Within the scan interval, it is possible to separately set an interval to which the electrocardiogram synchronization function is to be applied (step S5). The section can be set by operating the mouse 58 on the scout image display area 40. 63 is a line indicating the start position to which the reconstruction processing by the electrocardiogram synchronization function set by the operation is applied, and 63 is a line indicating the end position. These start positions and end positions can be set and corrected by numerical values in the setting fields 45 and 46, respectively.
[0034]
When the electrocardiogram synchronization function ON is selected in the selection field 44, the rotation speed of the gantry rotation unit 3 synchronized with the heartbeat cycle of the subject measured using the electrocardiograph 300 is changed to the gantry rotation speed setting field 47. Is displayed. However, it is also possible to correct the displayed rotational speed value. In addition, the output of the electrocardiograph 300 is not directly used for calculating the rotation speed of the gantry rotation unit 3, but the user inputs a heartbeat cycle from a keyboard or the like, and the rotation speed of the gantry rotation unit 3 is determined based on the information. You may make it calculate. Further, a helical pitch suitable for providing a tomographic image suitable for heart diagnosis is displayed in the helical pitch setting field 48. The helical pitch refers to the transport amount of the table 11 when it is rotated by the collection angle of projection data required for reconstruction of one tomographic image.
[0035]
In step S6, other scanning conditions are set. Other scan conditions include full scan mode / half scan mode selection, scan type (axial / helical) selection, and various items such as tube current and tube voltage. Omitted.
[0036]
The setting items not shown include the gantry rotation speed and the helical pitch when the electrocardiogram synchronization function OFF is selected. However, when the electrocardiogram synchronization function ON is selected on this screen, the gantry rotation speed and helical pitch necessary for realizing the function are preferentially applied.
[0037]
Reference numeral 49 denotes a registration button for registering the contents displayed in each setting column as a scan condition, and reference numeral 50 denotes a cancel button for ending this scan plan screen without registration. By pressing the registration button 49, the scan plan process is completed.
[0038]
When the above scan plan is completed and the scan is executed, the diagnosis of the lung field and the heart that have performed the scan can be performed. For example, when the “diagnosis” button 24 in FIG. 3 is pressed, a tomographic image of the lung field designated as a scan section on the scan plan screen can be displayed in the image area 23. Thereby, the lung field can be diagnosed.
[0039]
When the “cardiac diagnosis” button 25 in FIG. 3 is pressed, a tomographic image of the heart section designated as the section to be subjected to image reconstruction to which the electrocardiogram synchronization function is applied on the scan plan screen is displayed in the image area 23. In addition to being able to display, calcification scoring useful for cardiac diagnosis is performed and the results can be displayed. Since the reconstructed tomogram is based on the electrocardiogram synchronization function, the result of calcification scoring is also highly reliable. The calcified portion in the tomographic image of the heart displayed here may be highlighted.
[0040]
According to the embodiment described above, on the same scan plan screen in which a scan section is set, a part of the scan section is set as a section to be subjected to image reconstruction using the electrocardiogram synchronization function. can do. As a result, when both a lung field diagnosis and a heart diagnosis are performed on a single patient, for example, a lung field diagnosis scan and a heart diagnosis scan are separately performed. There is no need to do it.
[0041]
In the above embodiment, for the purpose of lung field diagnosis and heart diagnosis, the lung field region is set as a scan section, and a part of the section is set as a section for performing image reconstruction using an electrocardiogram synchronization function. However, the present invention is not limited to this embodiment.
[0042]
For example, a so-called respiratory synchronous scan is known in addition to an electrocardiographic synchronous scan as a technique for eliminating an artifact caused by the movement of the subject. In this respiratory synchronization scan, for example, projection data having the same phase in the respiratory cycle is collected by performing a scan synchronized with the respiratory cycle on an abdomen or the like whose shape periodically changes due to respiratory motion. When this respiration-synchronized scan is performed, only projection data related to a specific period of respiration motion can be arranged as much as necessary for reconstruction of one image, and artifacts due to respiration motion can be eliminated. That is, the respiratory synchronization scan and the electrocardiogram synchronization scan are the same in terms of technical idea.
[0043]
Therefore, for example, for the purpose of diagnosing the lumbar vertebra and abdomen, the lumbar region is set as a scan interval, and the abdominal region, which is a partial interval, is set as an interval for performing image reconstruction using the respiratory synchronization function. Even in this case, it can be realized in the same manner as in the above embodiment.
[0044]
In short, the present invention has a body motion synchronization function that provides a tomographic image while avoiding image quality deterioration due to a change in shape (body motion) of a portion whose shape changes under the influence of periodic physiological motion. In addition to setting a scan section on the same scan plan screen, a part of the scan section can be set as a section to be subjected to image reconstruction to which the body motion synchronization function is applied. Here, the part set as the scan section and the part to which the body motion synchronization function is applied are not limited to the lung field region and the heart, and the lumbar region and the abdomen as described above, and can be in any combination.
[0045]
Furthermore, it has both an electrocardiogram synchronization function and a respiratory synchronization function, and a heart region is set as the first scan interval, and an abdominal region is set as the second scan interval. The scope of the present invention also includes a configuration in which both functions can be set on the same scan plan screen so that the respiratory synchronization function is applied to the abdominal region.
[0046]
Note that most of the control processing in the embodiment described above is realized by processing by the operation console 200 in the X-ray CT system. However, an image observation terminal (for screening examination or the like) independent of the operation console 200 ( It is of course possible to connect Dr's console to the above system and let the terminal perform the processing after the scan plan. Since the configuration of the operation console 200 and the image observation terminal itself can be realized by a general-purpose image processing apparatus (workstation, personal computer, etc.), as described above, the software is installed in the apparatus and is realized by that. It is possible.
[0047]
Therefore, the program itself installed in the computer and the recording medium itself storing the program for realizing the functional processing of the present invention by the computer also realize the present invention. That is, the claims of the present invention include the program itself for realizing the functional processing of the present invention and a computer-readable recording medium storing the program.
[0048]
Examples of the recording medium for supplying the program include a flexible disk, an optical disk (CD-ROM, CD-R, CD-RW, DVD, etc.), a magneto-optical disk, a magnetic tape, and a memory card.
[0049]
In addition, the program supply method includes a mode in which the program of the present invention is acquired by file transfer via the Internet.
[0050]
【The invention's effect】
As described above, according to the present invention, it is possible to perform a plurality of types of screening including the diagnosis of the heart from the scan results performed at a time, thereby improving the examination efficiency.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an X-ray CT system in an embodiment.
FIG. 2 is a flowchart showing the contents of scan plan processing in the embodiment.
FIG. 3 is a diagram illustrating an example of an initial screen displayed by the image processing program of the embodiment.
FIG. 4 is a diagram illustrating an example of a scout scan setting screen in the embodiment.
FIG. 5 is a diagram showing an example of a scan plan screen in the embodiment.

Claims (14)

An X-ray CT system for performing a scan to collect projection data by irradiating a subject with X-rays from a plurality of directions and providing a tomographic image of the subject,
Reconstruction means for reconstructing a tomogram based on the input projection data;
Extracts projection data necessary for reconstruction of 1 tomogram from the projection data said collection, a first reconstruction processing based on the extracted projection data, periodic physiological motion of the subject from the projection data said collection extracts projection data required for the synchronization function for reconstruction of 1 tomogram at a specific period, control means for controlling so as to perform the second reconstruction processing and each said reconstructing means based on the extracted projection data When,
Setting means for setting conditions relating to scan and tomographic reconstruction in advance, means for designating a first section for performing the first reconstruction processing, and means for selecting use of the synchronization function; When the use of the synchronization function is selected, the second section included in the first section is designated as a section for performing the second reconfiguration process, and the use of the synchronization function is selected. A scan condition for performing the second reconstruction process when set, the scan condition for performing the second reconstruction process is set in preference to the scan condition capable of performing the first reconstruction process;
An X-ray CT system comprising: setting means including: The X-ray CT system according to claim 1, wherein the designation of the first section and the designation of the second section are performed on the same scan plan screen. The X-ray CT system according to claim 1, wherein the periodic physiological movement is a heartbeat movement. The X-ray CT system according to claim 3, wherein the first section is designated as a lung field region, and the second section is designated as a heart region. The X-ray CT system according to claim 1, wherein the periodic physiological movement is a respiratory movement. 6. The X-ray CT system according to claim 5, wherein the first section is designated as a lumbar region, and the second section is designated as an abdominal region. An X-ray CT system for performing a scan to collect projection data by irradiating a subject with X-rays from a plurality of directions and providing a tomographic image of the subject,
Reconstruction means for reconstructing a tomogram based on the input projection data;
Extracts projection data required for the synchronization function for reconstruction of 1 tomogram from the projection data said collection, the period of the first and reconstruction process, the object from the projection data said collection based on the extracted projection data Control to extract projection data required for reconstruction of one tomographic image in a specific period of the physiological physiology and to cause the reconstruction means to perform at least one of the second reconstruction processing based on the extracted projection data Control means to
Setting means for setting conditions relating to scan and tomographic reconstruction in advance, means for designating a first section for performing the first reconstruction processing, and means for selecting use of the synchronization function; When the use of the synchronization function is selected, the second section included in the first section is designated as a section for performing the second reconfiguration process, and the use of the synchronization function is selected. A scan condition for performing the second reconstruction process when set, the scan condition for performing the second reconstruction process is set in preference to the scan condition capable of performing the first reconstruction process;
An X-ray CT system comprising: setting means including: An operation console in an X-ray CT system that performs a scan to collect projection data by irradiating a subject with X-rays from a plurality of directions and provides a tomographic image of the subject,
Reconstruction means for reconstructing a tomogram based on the input projection data;
Extracts projection data necessary for reconstruction of 1 tomogram from the projection data said collection, a first reconstruction processing based on the extracted projection data, periodic physiological motion of the subject from the projection data said collection Control is performed so that projection data required for the synchronization function for reconstructing one tomogram in a specific period is extracted, and at least one of the second reconstruction processing based on the extracted projection data is performed by the reconstruction unit. Control means to
Setting means for setting conditions relating to scan and tomographic reconstruction in advance, means for designating a first section for performing the first reconstruction processing, and means for selecting use of the synchronization function; When the use of the synchronization function is selected, the second section included in the first section is designated as a section for performing the second reconfiguration process, and the use of the synchronization function is selected. A scan condition for performing the second reconstruction process when set, the scan condition for performing the second reconstruction process is set in preference to the scan condition capable of performing the first reconstruction process;
An operation console in an X-ray CT system , comprising: setting means including: The operation console in the X-ray CT system according to claim 8, wherein the designation of the first section and the designation of the second section are performed on the same scan plan screen. The operation console in the X-ray CT system according to claim 8, wherein the periodic physiological movement is a heartbeat movement. The operation console in the X-ray CT system according to claim 10, wherein the first section is designated as a lung field region and the second section is designated as a heart region. The operation console in the X-ray CT system according to claim 8, wherein the periodic physiological movement is a respiratory movement. The operation console in the X-ray CT system according to claim 12, wherein the first section is designated as a lumbar region and the second section is designated as an abdominal region. A program for controlling an operation console in an X-ray CT system that performs a scan to collect projection data by irradiating a subject with X-rays from a plurality of directions, and provides a tomographic image of the subject,
A reconstruction step for reconstructing a tomogram based on the input projection data;
Extracts projection data necessary for reconstruction of 1 tomogram from the projection data said collection, a first reconstruction processing based on the extracted projection data, periodic physiological motion of the subject from the projection data said collection Control is performed so that projection data required for the synchronization function for reconstructing one tomogram in a specific period is extracted, and at least one of the second reconstruction processing based on the extracted projection data is performed by the reconstruction step. A control step to
A setting step for setting conditions relating to the reconstruction of a scan and a tomographic image in advance, the step of designating a first section for performing the first reconstruction process, and means for selecting use of the synchronization function; When the use of the synchronization function is selected, the step of designating the second section included in the first section as the section for performing the second reconfiguration process and the use of the synchronization function are selected. If so, a step of setting a scan condition for performing the second reconstruction process with higher priority than a scan condition capable of performing the first reconstruction process;
A program comprising: a setting step including:

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