Information processing device, information processing method, and information processing program

Abstract

The objective is to obtain an information processing device, an information processing method, and an information processing program that can reduce the processing load performed during imaging by a CT scanner. [Solution] When the information processing device receives an instruction to start imaging from the CT device, it sequentially stores a plurality of first projection data output from the CT device in a storage device, and generates a first CT image by reconstructing an image based on second projection data, which is projection data based on the first projection data and is fewer in number than the number of first projection data. After imaging is completed by the CT device, it generates a second CT image by reconstructing an image based on the plurality of first projection data.

Description

Technical Field

[0001] The present disclosure relates to an information processing apparatus, an information processing method, and an information processing program.

Background Art

[0002] Patent Document 1 discloses a technique for generating a CT image by performing correction processing on projection data output from a CT (Computed Tomography) apparatus and reconstructing an image based on the corrected projection data.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when generating a CT image by performing storage of projection data, correction processing on the projection data, and reconstruction of an image based on the corrected projection data during imaging in a CT apparatus, the processing load may become high. In this case, due to the influence of the high load, the storage processing of the projection data may be delayed, or the display of the CT image may be delayed, making it impossible for the user to confirm whether the imaging is being performed normally. For example, in a photon counting type CT apparatus, the processing load may become even higher as the amount of projection data increases and the correction processing of the radiation detector increases.

[0005] The present disclosure has been made in view of the above circumstances, and an object thereof is to provide an information processing apparatus, an information processing method, and an information processing program capable of reducing the processing load during imaging by a CT apparatus.

Means for Solving the Problems

[0006] The information processing device of the technology disclosed herein includes a processor, which, upon receiving an instruction to start imaging in a CT device, sequentially stores a plurality of first projection data output from the CT device in a storage device, generates a first CT image by reconstructing an image based on second projection data, which is projection data based on the first projection data and is fewer in number than the number of first projection data, and generates a second CT image after imaging is completed in the CT device by reconstructing an image based on the plurality of first projection data.

[0007] The processor may, after the completion of imaging in the CT device, perform correction processing on multiple first projection data, store the corrected multiple first projection data in a storage device, and generate a second CT image by reconstructing the image based on the corrected multiple first projection data.

[0008] The processor may accept image reconstruction conditions and generate a third CT image by reconstructing the image according to the accepted reconstruction conditions based on a plurality of corrected first projection data stored in a storage device.

[0009] The processor may select projection data reduction parameters according to the acquisition mode, acquire second projection data from first projection data according to the selected reduction parameters, and generate a first CT image by reconstructing the image based on the second projection data.

[0010] The processor may select correction parameters according to the shooting mode, perform correction processing on the second projection data according to the selected correction parameters, and generate a first CT image by reconstructing the image based on the corrected second projection data.

[0011] The processor may include at least one CPU and one GPU.

[0012] The CT scanner may include a photon-counting type radiation detector.

[0013] The information processing method of the technology disclosed herein includes an information processing device equipped with a processor, in which, upon receiving an instruction to start imaging in a CT device, sequentially stores a plurality of first projection data output from the CT device in a storage device, generates a first CT image by reconstructing an image based on second projection data, which is projection data based on the first projection data and is fewer in number than the number of first projection data, and after the completion of imaging in the CT device, executes a process to generate a second CT image by reconstructing an image based on a plurality of first projection data.

[0014] The information processing program of the technology disclosed herein causes the processor of an information processing device equipped with a processor to perform the following processes when it receives an instruction to start imaging in a CT device: sequentially save a plurality of first projection data output from the CT device to a storage device, generate a first CT image by reconstructing an image based on second projection data, which is projection data based on the first projection data and is fewer in number than the number of first projection data; and generate a second CT image by reconstructing an image based on a plurality of first projection data after imaging is completed in the CT device. [Effects of the Invention]

[0015] According to this disclosure, the processing load performed during imaging by a CT scanner can be reduced. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic diagram showing an example of the configuration of a tomographic imaging system. [Figure 2] Block diagram showing an example of a console hardware configuration. [Figure 3] This block shows an example of the console's functional configuration. [Figure 4] This is a diagram illustrating the process of generating the first CT image. [Figure 5]It is a diagram for explaining the generation process of the first CT image according to a modified example. [Figure 6] It is a diagram for explaining the generation process of the first CT image and the storage process of the first projection data. [Figure 7] It is a flowchart showing an example of the imaging control process. [Figure 8] It is a flowchart showing an example of the generation process of the third CT image.

Embodiments for Carrying Out the Invention

[0017] Hereinafter, with reference to the drawings, exemplary embodiments for implementing the technology of the present disclosure will be described in detail.

[0018] First, referring to FIG. 1, the configuration of the tomographic imaging system 10 will be described. As shown in FIG. 1, the tomographic imaging system 10 according to the present embodiment includes a CT apparatus 11 and a console 12.

[0019] The CT apparatus 11 obtains a CT image including a plurality of tomographic images of the subject H by imaging the subject H using X-rays, which is an example of radiation. The CT apparatus 11 includes a gantry 18 and a couch device 19. FIG. 1 is a front view of the gantry 18 and the couch device 19. The couch device 19 includes a top plate 19A on which the subject H can be placed in a supine position. Hereinafter, the longitudinal direction of the top plate 19A will be described as the Z-axis direction, the short-side direction of the top plate 19A as the X-axis direction, and the vertical direction as the Y-axis direction. The top plate 19A can move in the Z-axis direction while maintaining a horizontal state. The gantry 18 has an overall annular shape, and a circular opening 18A having a diameter larger than the width of the top plate 19A is formed at the center. At the time of imaging, the top plate 19A on which the subject H is placed enters the opening 18A by moving in the Z-axis direction with respect to the gantry 18. Imaging is performed while moving the top plate 19A with respect to the gantry 18.

[0020] Inside the gantry 18 are a radiation source 21, a radiation detector 22, and a frame 23. The radiation source 21 irradiates radiation toward the subject H. The radiation detector 22 detects the radiation that has passed through the subject H. The radiation that has passed through the subject H is attenuated by interactions with structures such as organs and bones inside the subject H (e.g., absorption and scattering of radiation). Each structure has its own unique attenuation coefficient for radiation, and the radiation that has passed through a structure carries information that reflects the physical properties of the structure. The radiation detector 22 detects radiation that reflects the physical properties of the structures inside the subject H. The radiation detector 22 has a detection surface in which detection elements are arranged in two dimensions, and outputs a detection signal for each detection element. Therefore, the radiation detector 22 can detect radiation at each transmission position as it passes through the structures of the subject H. In addition, the radiation detector 22 has a roughly arc shape according to the curvature of the gantry 18, and its detection surface is also curved. The radiation detector 22 is an example of a photon-counting type radiation detector, and is a radiation detector capable of counting the number of photons in incident radiation. In other words, the CT device 11 is a PCCT (Photon Counting Computed Tomography) device. The radiation detector 22 may also be an energy-integrating type radiation detector that, for example, converts radiation into visible light and then converts the visible light into an electrical signal, accumulating the resulting charge for a certain period of time.

[0021] Within the gantry 18, the radiation source 21 and the radiation detector 22 are positioned opposite each other and rotate around the Z-axis while maintaining their opposing orientation. The frame 23 is annular in shape and rotatably supports the radiation source 21 and the radiation detector 22. During imaging, the gantry 18 rotates the radiation source 21 and the radiation detector 22 around the subject H on the top plate 19A, and the radiation detector 22 acquires detection signals at multiple positions in the circumferential direction around the Z-axis corresponding to the body axis of the subject H. During imaging, the top plate 19A also moves in the Z-axis direction in synchronization with the rotation of the radiation source 21 and the radiation detector 22.

[0022] The Data Acquisition System (DAS) 25 collects the detection signal output by the radiation detector 22, generates output data for each position around the Z axis based on the collected detection signal, and outputs the generated output data to the console 12. If an object H exists between the radiation source 21 and the radiation detector 22, this output data is projection data of the object H.

[0023] A field limiter 24 (also called a collimator) is positioned in front of the radiation source 21 in the direction of irradiation to limit the radiation field. The field limiter 24 has an irradiation aperture whose outline is defined by multiple shielding plates that shield the radiation, and the size of the irradiation aperture can be changed by moving the shielding plates. Voltage is supplied to the radiation source 21 from a high-voltage generator 26. The radiation source 21 and the radiation detector 22 are electrically connected to the frame 23 using a slip ring system, for example, and power supply and data transmission and reception are performed via the slip rings. The slip ring connection system enables helical scan imaging, in which the radiation source 21 and the radiation detector 22 are rotated in one direction without reversing the direction of rotation.

[0024] Console 12 controls the radiation source 21 and radiation detector 22 via a control device (not shown) provided in the gantry 18. Console 12 is an example of an information processing device relating to the disclosed technology. The imaging conditions of the CT apparatus 11 are set by operation from console 12. The imaging conditions include the radiation irradiation conditions and imaging range of the radiation source 21. The radiation irradiation conditions include the tube voltage (unit: kV), tube current (unit: mA), and radiation irradiation time (unit: msec) applied to the radiation source 21. The imaging range is adjusted, for example, in the XY plane by changing the size of the irradiation aperture of the irradiation field limiter 24, and in the Z axis direction by changing the movement range of the top plate 19A.

[0025] Referring to Figure 2, the hardware configuration of the console 12 according to this embodiment will be described. An example of the console 12 is a personal computer or a server computer. As shown in Figure 2, the console 12 includes a CPU (Central Processing Unit) 31, a memory 32 as a temporary storage area, and a non-volatile storage unit 33. The console 12 also includes a display 34 such as a liquid crystal display, input devices 35 such as a keyboard and mouse, and a network interface 36 connected to the CT device 11. The CPU 31, memory 32, storage unit 33, display 34, input devices 35, and network interface 36 are connected to a bus 37. The CPU 31 is an example of a processor according to the disclosed technology.

[0026] The storage unit 33 is implemented by an HDD (Hard Disk Drive), SSD (Solid State Drive), or flash memory, etc. The storage unit 33, as a storage medium, stores the information processing program 40. The CPU 31 reads the information processing program 40 from the storage unit 33, expands it into memory 32, and executes the expanded information processing program 40.

[0027] In the CT scanner 11, during CT image acquisition, projection data is saved, correction processing is performed on the projection data, and the image is reconstructed based on the corrected projection data. The saving of projection data is performed to reconstruct the image under different reconstruction conditions than those used during acquisition. Image reconstruction during acquisition is performed so that users, such as technicians, can verify whether the acquisition is being performed correctly. Correction processing is performed on the projection data for image reconstruction.

[0028] If the processing performed during imaging by the CT scanner 11 increases the load on the console 12, the saving of projection data may be delayed, or the display of CT images may be delayed, making it impossible for the user to confirm whether the imaging was performed correctly. If the saving of projection data is delayed and radiation is terminated without confirming that the projection data has been saved correctly, there is a possibility that the projection data will not be saved correctly. On the other hand, if the saving of projection data is delayed and radiation is terminated only after confirming that the projection data has been saved correctly, the amount of radiation irradiated to the subject H will increase. If the saving of projection data is delayed, there is a possibility that the projection data will not be saved even though radiation is being irradiated to the subject H. Therefore, the console 12 according to this embodiment has a function to perform a simple image reconstruction in order to reduce the processing load performed during imaging by the CT scanner 11.

[0029] Next, the functional configuration of the console 12 will be described with reference to Figure 3. As shown in Figure 3, the console 12 includes an image capture control unit 50, an acquisition unit 52, a storage unit 54, a first reconstruction unit 56, a second reconstruction unit 58, a reception unit 60, and a third reconstruction unit 62. The CPU 31 executes the information processing program 40, thereby enabling the image capture control unit 50, the acquisition unit 52, the storage unit 54, the first reconstruction unit 56, the second reconstruction unit 58, the reception unit 60, and the third reconstruction unit 62 to function.

[0030] When the imaging control unit 50 receives an instruction to start imaging from the CT device 11, it controls the system to start irradiating radiation and acquire a CT image of the subject H using a helical scan method, according to the imaging conditions. The instruction to start imaging is input by the user, for example, via the input device 35.

[0031] The acquisition unit 52 sequentially acquires a plurality of first projection data outputs from the DAS 25 under the control of the imaging control unit 50. The storage unit 54 sequentially stores the plurality of first projection data acquired by the acquisition unit 52 in the storage unit 33. The storage unit 33 is an example of a storage device according to the disclosed technology. In this embodiment, the storage unit 54 stores the first projection data in the storage unit 33 each time the first projection data is acquired from the DAS 25. That is, during imaging by the CT device 11, the first projection data is stored in the storage unit 33 in real time.

[0032] The first reconstruction unit 56 generates a first CT image by reconstructing an image based on second projection data, which is projection data based on the first projection data and is fewer in number than the number of first projection data. An example of the image reconstruction process performed by the first reconstruction unit 56 is described below.

[0033] The first reconstruction unit 56 acquires a number of second projection data points that is less than the number of first projection data points, based on the first projection data. As an example, as shown in Figure 4, the first reconstruction unit 56 acquires one second projection data point by averaging two or more preset numbers (three in the example of Figure 4) of first projection data points. The first reconstruction unit 56 averages the first projection data points each time a preset number of first projection data points are acquired by the acquisition unit 52. As a result, the number of second projection data points is less than the number of first projection data points. In this embodiment, the first reconstruction unit 56 acquires a number of second projection data points that is less than the number of first projection data points for both the channel direction and the body axis direction of the subject H.

[0034] The first reconstruction unit 56 performs correction processing on the acquired second projection data. Examples of correction processing include logarithmic transformation, offset correction, sensitivity correction, and beam hardening correction. The first reconstruction unit 56 then generates a first CT image by reconstructing the image based on the corrected second projection data. Image reconstruction is performed, for example, by a filtered back projection method. The first reconstruction unit 56 reconstructs the image each time the number of second projection data reaches a number that can generate a tomographic image. As a result, the first CT image is displayed on the display 34 during acquisition, allowing the user to confirm whether the acquisition is being performed correctly.

[0035] As an example, as shown in Figure 5, the first reconstruction unit 56 may obtain one second projection data by extracting one projection data from two or more pre-set first projection data. Figure 5 shows an example where projection data has been extracted and is filled with diagonal lines.

[0036] As an example, as shown in Figure 6, the process of generating a first CT image using first projection data output from the CT device 11 and the process of saving the first projection data to the storage unit 33 may be executed in parallel. This parallel processing may be shared among multiple cores of the CPU 31. Alternatively, the console 12 may include at least one CPU and one GPU (Graphics Processing Unit), and the parallel processing may be shared between the CPU and the GPU. When the parallel processing is shared between the CPU and the GPU, for example, the GPU may be responsible for generating the first CT image using the first projection data, and the CPU may be responsible for saving the first projection data to the storage unit 33.

[0037] The second reconstruction unit 58 generates a second CT image by reconstructing the image based on a plurality of first projection data after the completion of imaging in the CT device 11. Specifically, the second reconstruction unit 58 performs correction processing on the plurality of first projection data after the completion of imaging in the CT device 11 and stores the corrected plurality of first projection data in the storage unit 33. The second reconstruction unit 58 then generates a second CT image by reconstructing the image based on the corrected plurality of first projection data. The second CT image is used, for example, for image interpretation. Examples of correction processing include logarithmic transformation processing, offset correction, sensitivity correction, and beam hardening correction. Image reconstruction is performed, for example, by a filtered back projection method.

[0038] The reception unit 60 accepts image reconstruction conditions. Users may want to reconstruct images using different reconstruction conditions than those used during acquisition. For example, if a metallic object is visible in the second CT image, the user may want to reconstruct the image with the metal artifact reduction (correction) function turned on. Examples of reconstruction conditions include turning the metal artifact reduction function on or off, turning the motion correction function on or off, filter settings according to the area being scanned, and FOV (Field of View) settings. In this case, for example, the user inputs the image reconstruction conditions via the input device 35.

[0039] The third reconstruction unit 62 generates a third CT image by reconstructing the image according to the reconstruction conditions received by the reception unit 60, based on a plurality of corrected first projection data stored in the storage unit 33. Image reconstruction is performed, for example, by the filtered back projection method. In this way, when a third CT image is generated using reconstruction conditions different from those of the second CT image, the plurality of corrected first projection data stored during the generation of the second CT image are used. This reduces the time required for the generation of the third CT image compared to when correction processing is performed on the plurality of first projection data when generating the third CT image.

[0040] Next, the operation of the console 12 will be explained with reference to Figures 7 and 8. The CPU 31 executes the information processing program 40, thereby performing the imaging control process shown in Figure 7 and the third CT image generation process shown in Figure 8. The imaging control process is performed, for example, when the user inputs an instruction to start imaging. The third CT image generation process is performed, for example, when the user inputs image reconstruction conditions.

[0041] In step S10 of Figure 7, the imaging control unit 50 controls the irradiation of radiation according to the imaging conditions and takes a CT image of the subject H using the helical scan method. In step S12, the acquisition unit 52 acquires the first projection data output from the DAS 25. In step S14, the storage unit 54 stores the first projection data acquired in step S12 in the storage unit 33. Through repeated processing of steps S12 and S14, multiple first projection data are acquired sequentially and stored in the storage unit 33.

[0042] In step S16, the first reconstruction unit 56 determines whether a predetermined number of first projection data have been acquired through the processing in step S12. If this determination is negative, the process returns to step S12; if it is positive, the process proceeds to step S18.

[0043] In step S18, the first reconstruction unit 56 obtains one second projection data by averaging a predetermined number of first projection data acquired in step S12. In step S20, the first reconstruction unit 56 corrects the second projection data acquired in step S18. In step S22, it is determined whether the number of corrected second projection data obtained by the process in step S20 is sufficient to generate a tomographic image. If this determination is negative, the process returns to step S12; if it is positive, the process proceeds to step S24.

[0044] In step S24, the first reconstruction unit 56 generates a first CT image by reconstructing the image based on the corrected second projection data. This first CT image is displayed on the display 34. Each time the process in step S24 is executed, a first CT image with an added tomographic image is generated.

[0045] In step S26, the shooting control unit 50 determines whether or not shooting has finished. If the determination is negative, the process returns to step S12; if the determination is positive, the process proceeds to step S28. In step S28, the second reconstruction unit 58 performs correction processing on the multiple first projection data obtained through the repeated processing in step S12. In step S30, the second reconstruction unit 58 stores the multiple corrected first projection data obtained through the processing in step S28 in the storage unit 33.

[0046] In step S32, the second reconstruction unit 58 generates a second CT image by reconstructing the image based on the multiple corrected first projection data obtained in step S28. When the processing in step S32 is completed, the imaging control process ends.

[0047] In step S40 of Figure 8, the reception unit 60 receives the image reconstruction conditions. In step S42, the third reconstruction unit 62 generates a third CT image by reconstructing the image according to the reconstruction conditions received in step S40, based on a plurality of corrected first projection data stored in the storage unit 33. When the processing in step S42 is completed, the generation process of the third CT image is completed.

[0048] As explained above, according to this embodiment, the relatively computationally intensive correction processing performed during imaging is applied to a smaller number of second projection data than to the number of first projection data. Therefore, the processing load performed during imaging by the CT scanner can be reduced. As a result, it is possible to simultaneously save projection data during imaging and confirm the imaging status using CT images.

[0049] In the above embodiment, the first reconstruction unit 56 may select projection data reduction parameters (for example, parameters for reducing the number or volume of data) according to the shooting mode, and acquire second projection data from the first projection data according to the selected reduction parameters. In this case, the first reconstruction unit 56 generates a first CT image by reconstructing the image based on the second projection data acquired according to the reduction parameters. Examples of reduction parameters include the ratio of the number of second projection data to the number of first projection data in the channel direction, and the ratio of the number of second projection data to the number of first projection data in the body axis direction. Examples of shooting modes include high-definition mode, material discrimination mode, and a hybrid mode of high-definition mode and material discrimination mode. In this embodiment, sets of multiple reduction parameters according to the shooting mode may be stored in the storage unit 33. Furthermore, the first reconstruction unit 56 may reduce the number of second projection data as the image quality of the first CT image required by the shooting mode decreases.

[0050] Furthermore, in the above embodiment, the first reconstruction unit 56 may select correction parameters according to the shooting mode and perform correction processing on the second projection data according to the selected correction parameters. In this case, the first reconstruction unit 56 generates a first CT image by reconstructing the image based on the corrected second projection data according to the selected correction parameters. Examples of correction parameters include logarithmic transformation processing, offset correction, sensitivity correction, and beam hardening correction. Examples of shooting modes include high-definition mode, material discrimination mode, and a hybrid mode of high-definition mode and material discrimination mode. In this embodiment, sets of multiple correction parameters according to the shooting mode may be stored in the storage unit 33.

[0051] Furthermore, at least one of the functional units of the console 12 in the above embodiment may be provided by other devices such as a control device provided by the gantry 18.

[0052] Furthermore, in the above embodiments, each process is executed on any computer. The computer may execute these processes using a processor as hardware, a program as software, or a combination thereof. In this case, the processor is configured to work in cooperation with the program to execute the various processes in the above embodiments and can function as a unit or means in the above embodiments. The execution order of the processes by the processor is not limited to the order described and may be changed as appropriate. The computer may be a general-purpose computer, a computer designed for a specific purpose, a workstation, or any other system capable of executing each process.

[0053] A processor may consist of one or more hardware components, and the type of hardware is not limited. For example, a processor may consist of a CPU (Central Processing Unit), an MPU (Micro Processing Unit), a programmable logic device such as an FPGA (Field Programmable Gate Array), a dedicated circuit for executing a specific process such as an ASIC (Application Specific Integrated Circuit), a GPU (Graphic Processing Unit), or an NPU (Neural Processing Unit). Furthermore, the type of hardware may be a combination of different types of hardware. When multiple hardware components are configured to execute one or more processes of a processor, these components may reside in physically separate devices or in the same device. Also, in any embodiment, the order of each process performed by the processor is not limited to the order described above and may be changed as appropriate. Hardware is composed of electrical circuits (circuitry) that combine circuit elements such as semiconductor elements.

[0054] Furthermore, the program may be firmware or software such as microcode. Alternatively, the program may be, for example, a set of program modules, each function of which may be implemented by a processor configured to perform its respective function. The program may be program code or multiple code segments stored on one or more non-temporary computer-readable media (e.g., storage media or other storage). The program may be divided and stored on multiple non-temporary computer-readable media located on physically separate devices. Program code or code segments may represent any combination of procedures, functions, subprograms, routines, subroutines, modules, software packages, classes, or instructions, data structures, or program statements. Program code or code segments may be connected to other code segments or hardware circuits by sending and receiving information, data, arguments, parameters, or memory contents.

[0055] Furthermore, although the above embodiment describes an embodiment in which the information processing program 40 is pre-stored (installed) in the storage unit 33, the invention is not limited to this. The information processing program 40 may be provided in the form of being recorded on a recording medium such as a CD-ROM (Compact Disc Read Only Memory), DVD-ROM (Digital Versatile Disc Read Only Memory), and USB (Universal Serial Bus) memory. The information processing program 40 may also be provided in the form of being downloaded from an external device via a network. In addition, the information processing program 40 can be provided as a program product. A program product includes any form of product for providing a program. For example, a program product includes a program provided via a network such as the Internet, and a non-temporary computer-readable recording medium such as a CD-ROM or DVD on which the program is stored.

[0056] The following additional information is disclosed regarding the embodiments described above. (Note 1) Equipped with a processor, The aforementioned processor, When an instruction to start imaging is received from the CT device, a plurality of first projection data output from the CT device are sequentially stored in a storage device, and a first CT image is generated by reconstructing an image based on second projection data, which is based on the first projection data and is fewer in number than the number of first projection data. After the CT scan is completed in the CT apparatus, a second CT image is generated by reconstructing the image based on the plurality of first projection data. Information processing device.

[0057] (Note 2) The aforementioned processor, After the CT scanner completes the imaging, the plurality of first projection data are corrected, and the corrected plurality of first projection data are stored in the storage device. The second CT image is generated by reconstructing the image based on the corrected plurality of first projection data. The information processing device described in Appendix 1.

[0058] (Note 3) The aforementioned processor, Accepting the image reconstruction conditions, A third CT image is generated by reconstructing the image according to the received reconstruction conditions, based on the multiple corrected first projection data stored in the storage device. The information processing device described in Appendix 2.

[0059] (Note 4) The aforementioned processor, Select the parameters for reducing projection data according to the shooting mode. The second projection data is obtained from the first projection data according to the selected reduction parameter. The first CT image is generated by reconstructing the image based on the second projection data. An information processing device as described in any one of the appendices 1 to 3.

[0060] (Note 5) The aforementioned processor, Select the correction parameters according to the shooting mode, Correction processing is performed on the second projection data according to the selected correction parameters. The first CT image is generated by reconstructing the image based on the corrected second projection data. An information processing device as described in any one of the appendices 1 through 4.

[0061] (Note 6) The aforementioned processor, Includes at least one CPU and one GPU. An information processing device as described in any one of the appendices 1 through 5.

[0062] (Note 7) The CT apparatus includes a photon counting type radiation detector. An information processing device as described in any one of the appendices 1 through 6.

[0063] (Note 8) The processor of an information processing device equipped with a processor, When an instruction to start imaging is received from the CT device, a plurality of first projection data output from the CT device are sequentially stored in a storage device, and a first CT image is generated by reconstructing an image based on second projection data, which is based on the first projection data and is fewer in number than the number of first projection data. After the CT scan is completed in the CT apparatus, a second CT image is generated by reconstructing the image based on the plurality of first projection data. An information processing method that performs a process.

[0064] (Note 9) The processor of the information processing device, which is equipped with a processor, When an instruction to start imaging is received from the CT device, a plurality of first projection data output from the CT device are sequentially stored in a storage device, and a first CT image is generated by reconstructing an image based on second projection data, which is based on the first projection data and is fewer in number than the number of first projection data. After the CT scan is completed in the CT apparatus, a second CT image is generated by reconstructing the image based on the plurality of first projection data. An information processing program used to execute a process. [Explanation of symbols]

[0065] 10 Tomography System 11 CT device 12 Consoles 18 Gantry 18A opening 19 Bed equipment 19A Top plate 21 Radiation source 22 Radiation detectors 23 frames 24 Irradiation field limiter 25 DAS 26 High-voltage generator 31 CPU 32 memory 33 Storage section 34 displays 35 Input device 36 Network Interfaces 37 Bus 40 Information Processing Programs 50 Imaging control unit 52 Acquisition Department 54 Preservation Department 56 1st reconstruction part 58 Second reconstruction part 60 Reception Department 62 Third reconstruction part H Subject

Claims

1. Equipped with a processor, The aforementioned processor, When an instruction to start imaging is received from the CT device, a plurality of first projection data output from the CT device are sequentially stored in a storage device, and a first CT image is generated by reconstructing an image based on second projection data, which is based on the first projection data and is fewer in number than the number of first projection data. After the CT scan is completed in the CT apparatus, a second CT image is generated by reconstructing the image based on the plurality of first projection data. Information processing device.

2. The aforementioned processor, After the CT scanner completes the imaging, the plurality of first projection data are corrected, and the corrected plurality of first projection data are stored in the storage device. The second CT image is generated by reconstructing the image based on the corrected plurality of first projection data. The information processing apparatus according to claim 1.

3. The aforementioned processor, Accepting the image reconstruction conditions, A third CT image is generated by reconstructing the image according to the received reconstruction conditions, based on the plurality of corrected first projection data stored in the storage device. The information processing apparatus according to claim 2.

4. The aforementioned processor, Select the parameters for reducing projection data according to the shooting mode. The second projection data is obtained from the first projection data according to the selected reduction parameter. The first CT image is generated by reconstructing the image based on the second projection data. An information processing apparatus according to any one of claims 1 to 3.

5. The aforementioned processor, Select the correction parameters according to the shooting mode, Correction processing is performed on the second projection data according to the selected correction parameters. The first CT image is generated by reconstructing the image based on the corrected second projection data. An information processing apparatus according to any one of claims 1 to 3.

6. The aforementioned processor, Includes at least one CPU and one GPU. An information processing apparatus according to any one of claims 1 to 3.

7. The CT apparatus includes a photon counting type radiation detector. An information processing apparatus according to any one of claims 1 to 3.

8. The processor of an information processing device equipped with a processor, When an instruction to start imaging is received from the CT device, a plurality of first projection data output from the CT device are sequentially stored in a storage device, and a first CT image is generated by reconstructing an image based on second projection data, which is based on the first projection data and is fewer in number than the number of first projection data. After the CT scan is completed in the CT apparatus, a second CT image is generated by reconstructing the image based on the plurality of first projection data. An information processing method that performs a process.

9. The processor of the information processing device, which is equipped with a processor, When an instruction to start imaging is received from the CT device, a plurality of first projection data output from the CT device are sequentially stored in a storage device, and a first CT image is generated by reconstructing an image based on second projection data, which is based on the first projection data and is fewer in number than the number of first projection data. After the CT scan is completed in the CT apparatus, a second CT image is generated by reconstructing the image based on the plurality of first projection data. An information processing program used to execute a process.

Images