Medical image processing method and X-ray CT scan control method

Abstract

To improve the throughput of image diagnosis using a medical image diagnostic device.SOLUTION: A medical image processing method according to an embodiment acquires first and second subject data obtained by first and second CT scans of a subject. The medical image processing method reads interlock setting of a reconstruction range indicating whether or not to interlock the first and second reconstruction ranges being the ranges of image reconstruction for first and second subject data with each other. The medical image processing method performs control on whether or not to change the second reconstruction range together with the first reconstruction range according to whether or not it is set to interlock the reconstruction range in the interlock setting in a case where there is a change instruction of the first reconstruction range. The medical image processing method reconstructs the first and second images from the first and second subject data within the range of image reconstruction according to the control.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The embodiments disclosed in this specification and the drawings relate to a medical image processing method and a method for controlling an X-ray CT scan.

Background Art

[0002] Conventionally, in a medical imaging diagnostic apparatus, there are cases where a shooting protocol for an examination is selected from a list including pre-created shooting protocols. Each shooting protocol in the list is pre-created as a general shooting protocol for a specific examination, for example, based on regulations in a hospital or dose guidelines.

[0003] However, when changing the reconstruction processing conditions for a plurality of scans included in one shooting protocol, it was necessary to set the reconstruction processing conditions for each of the plurality of scans. Therefore, when changing the reconstruction processing conditions, it took time to set the conditions for each scan, and the throughput of image diagnosis using the medical imaging diagnostic apparatus might decrease.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] One of the problems to be solved by the embodiments disclosed in this specification and the drawings is to improve the throughput of image diagnosis using a medical imaging diagnostic apparatus. However, the problems to be solved by the embodiments disclosed in this specification and the drawings are not limited to the above problems. The problems corresponding to each configuration shown in the embodiments described later can also be regarded as other problems.

Means for Solving the Problems

[0006] The medical image processing method according to the embodiment acquires first subject data obtained by a first CT scan of the subject and second subject data obtained by a second CT scan of the subject. The medical image processing method reads a reconstruction range linkage setting that indicates whether or not to link a first reconstruction range, which is the range of image reconstruction for the first subject data, and a second reconstruction range, which is the range of image reconstruction for the second subject data. When there is an instruction to change the first reconstruction range, the medical image processing method controls whether or not to change the second reconstruction range together with the first reconstruction range, depending on whether or not the linkage setting is set to link the reconstruction ranges. The medical image processing method reconstructs a first image from the first subject data and a second image from the second subject data within the image reconstruction range according to the control. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 shows an example of the configuration of an X-ray computed tomography (CT) apparatus according to an embodiment. [Figure 2] Figure 2 shows an example (1) of the protocol creation screen displayed in the display according to this embodiment. [Figure 3] Figure 3 shows an example (2) of the protocol creation screen displayed in the display according to this embodiment. [Figure 4] Figure 4 shows an example (3) of the protocol creation screen displayed in the display according to this embodiment. [Figure 5] Figure 5 shows an example of a protocol creation screen (4) displayed in the display according to this embodiment. [Figure 6] Figure 6 shows an example (5) of the protocol creation screen displayed in the display according to this embodiment. [Figure 7]Figure 7 shows an example (1) of the scan execution screen displayed in the display according to the embodiment. [Figure 8] Figure 8 shows an example (2) of the scan execution screen displayed in the display according to the embodiment. [Modes for carrying out the invention]

[0008] The following describes the medical image processing method and X-ray CT scan control method according to each embodiment, with reference to the drawings. In the following description, components having the same or substantially the same function as those described above in previously shown drawings are denoted by the same reference numeral, and are described again only when necessary. Furthermore, even when representing the same part, the dimensions and proportions may differ between drawings. In addition, components having the same or substantially the same function as those described above in previously shown drawings may be distinguished by adding "a," [b], [c], or "d" to the end of their name. Moreover, for example, from the viewpoint of ensuring the readability of the drawings, reference numerals may be assigned only to the main components in the description of each drawing, and reference numerals may not be assigned to components having the same or substantially the same function as those described above in previously shown drawings.

[0009] This embodiment illustrates an X-ray computed tomography (CT) device that implements a medical image processing method or an X-ray CT scan control method according to the embodiment. Figure 1 shows an example of the configuration of the X-ray CT device 1 according to the embodiment. The X-ray CT device 1 irradiates a subject P with X-rays from an X-ray tube 11 and detects the irradiated X-rays with an X-ray detector 12. The X-ray CT device 1 generates CT image (medical image) data related to the subject P based on the output from the X-ray detector 12.

[0010] As shown in Figure 1, the X-ray CT scanner 1 comprises a stand 10, a patient table 30, and a console 40. Note that, for illustrative purposes, multiple stands 10 are depicted in Figure 1. The stand 10 is a scanning device configured for X-ray CT imaging of a subject P. The patient table 30 is a transport device for positioning and placing the subject P to be X-ray CT imaging. The console 40 is a computer that controls the stand 10. For example, the stand 10 and patient table 30 are installed in the CT examination room, and the console 40 is installed in a control room adjacent to the CT examination room. The stand 10, patient table 30, and console 40 are connected to each other by wired or wireless connections, enabling communication between them. Here, the stand 10 and patient table 30 are examples of imaging units.

[0011] The console 40 does not necessarily have to be installed in the control room. For example, the console 40 may be installed in the same room as the frame 10 and the bed 30. Alternatively, the console 40 may be incorporated into the frame 10.

[0012] In this embodiment, the rotation axis of the rotating frame 13 or the longitudinal direction of the top plate 33 of the bed 30 in the non-tilted state is defined as the Z-axis direction, the axis direction perpendicular to the Z-axis direction and horizontal to the floor surface is defined as the X-axis direction, and the axis direction perpendicular to the Z-axis direction and perpendicular to the floor surface is defined as the Y-axis direction.

[0013] Here, the X-ray CT scanner 1 is connected to other devices, for example, via a hospital LAN (Local Area Network) installed within the hospital, and is in a state where it can communicate with each other directly or indirectly. For example, the X-ray CT scanner 1 is connected to a PACS (Picture Archiving and Communication System) server that stores and processes medical images, other medical imaging diagnostic devices, and terminal devices for the attending physician to view images. Each device sends and receives medical images and other data to and from each other, for example, in accordance with the DICOM (Digital Imaging and Communications in Medicine) standard.

[0014] Furthermore, in systems equipped with the aforementioned devices, systems such as HIS (Hospital Information System) and RIS (Radiology Information System) are introduced to manage various types of information. For example, the aforementioned system transmits examination orders created by terminal devices to each medical imaging diagnostic device. Each medical imaging diagnostic device obtains patient information from examination orders received directly from terminal devices, or from modality-specific patient lists (modality worklists) created by the PACS server that received the examination orders.

[0015] As shown in Figure 1, the stand 10 includes an X-ray tube 11, an X-ray detector 12, a rotating frame 13, an X-ray high-voltage device 14, a control device 15, a wedge 16, a collimator 17, and a data acquisition system (DAS) 18.

[0016] The X-ray tube 11 is a vacuum tube having a cathode (filament) that generates thermionic electrons and an anode (target) that generates X-rays upon collision with thermionic electrons. The X-ray tube 11 irradiates the subject P with X-rays by irradiating thermionic electrons from the cathode to the anode using a high voltage supplied from the X-ray high voltage device 14. Here, the X-ray tube 11 is an example of an X-ray generating unit. By switching the voltage supplied by the X-ray high voltage device 14 every predetermined number of views during X-ray irradiation, so-called dual-energy CT imaging can be realized. In this embodiment, the X-ray CT device 1 does not necessarily have to be capable of dual-energy CT imaging; it may be an X-ray CT device 1 that can only perform normal single-energy CT imaging. Furthermore, the X-ray CT device 1 may be capable of multi-energy CT imaging, which processes data of three or more types of energy, rather than being limited to dual-energy CT imaging.

[0017] The X-ray detector 12 detects the X-rays irradiated from the X-ray tube 11 and passed through the subject P, and outputs an electrical signal corresponding to the detected X-ray dose to the DAS 18. The X-ray detector 12 has, for example, an X-ray detector element array in which a plurality of X-ray detector elements are arranged in the channel direction along an arc centered on the focal point of the X-ray tube 11. The X-ray detector 12 has, for example, a structure in which a plurality of X-ray detector elements are arranged in the channel direction and a plurality of them are arranged in the slice direction (column direction, row direction). Here, the X-ray detector 12 is an example of an X-ray detection unit.

[0018] Further, the X-ray detector 12 is, for example, an indirect conversion type detector having a grid, a scintillator array, and an optical sensor array. The scintillator array has a plurality of scintillators. The scintillator has a scintillator crystal that outputs light with an amount corresponding to the incident X-ray dose. The grid is disposed on the surface of the scintillator array on the X-ray incident surface side, and has an X-ray shielding plate having a function of absorbing scattered X-rays. Note that the grid may also be called a collimator (one-dimensional collimator or two-dimensional collimator). The optical sensor array has a function of converting the light amount of the light from the scintillator into an electrical signal. As the optical sensor, for example, a photomultiplier tube (photomultiplier: PMT) or the like is used.

[0019] Note that the X-ray detector 12 may be a direct conversion type detector having a semiconductor element that converts the incident X-rays into an electrical signal.

[0020] The rotating frame 13 is an annular frame that supports the X-ray tube 11 and the X-ray detector 12 in opposition, and rotates the X-ray tube 11 and the X-ray detector 12 by a control device 15 described later. An image field of view (FOV) is set in the opening 19 of the rotating frame 13. For example, the rotating frame 13 is a casting made of aluminum. Note that the rotating frame 13 can further support, in addition to the X-ray tube 11 and the X-ray detector 12, an X-ray high voltage device 14, a wedge 16, a collimator 17, a DAS 18, and the like. Further, the rotating frame

[0021] The X-ray high-voltage device 14 has a high-voltage generator and an X-ray control device. The high-voltage generator has electric circuits such as a transformer and a rectifier, and generates a high voltage applied to the X-ray tube 11 and a filament current supplied to the X-ray tube 11. The X-ray control device controls the output voltage according to the X-ray irradiated by the X-ray tube 11. The high-voltage generator may be of a transformer type or an inverter type. The X-ray high-voltage device 14 may be provided on the rotating frame 13 in the gantry 10 or may be provided on a fixed frame (not shown) in the gantry 10. Here, the fixed frame is a frame that supports the rotating frame 13 rotatably. Here, the X-ray high-voltage device 14 is an example of an X-ray high-voltage section.

[0022] The control device 15 includes a drive mechanism such as a motor and an actuator, and a processing circuit having a processor and a memory for controlling this drive mechanism. The control device 15 receives an input signal from an input interface 43 or an input interface provided on the gantry 10, and controls the operations of the gantry 10 and the bed 30. For example, the control device 15 performs control to rotate the rotating frame 13, control to tilt the gantry 10, and control to operate the bed 30 in response to the input signal.

[0023] The control to tilt the gantry 10 is realized by the control device 15 rotating the rotating frame 13 about an axis parallel to the X-axis direction based on the tilt angle (tilt angle) information input by an input interface attached to the gantry 10. The control device 15 may be provided on the gantry 10 or may be provided on the console 40.

[0024] The wedge 16 is a filter for adjusting the amount of X-rays irradiated from the X-ray tube 11. Specifically, the wedge 16 is a filter that transmits and attenuates the X-rays irradiated from the X-ray tube 11 so that the X-rays irradiated from the X-ray tube 11 to the subject P have a predetermined distribution. For example, the wedge 16 is a wedge filter or a bow-tie filter, and is constructed by processing aluminum or the like to have a predetermined target angle and thickness.

[0025] The collimator 17 limits the irradiation range of X-rays that have passed through the wedge 16. The collimator 17 slidably supports multiple lead plates that shield the X-rays and adjusts the shape of the slit formed by the multiple lead plates. The collimator 17 is sometimes called an X-ray diaphragm.

[0026] The DAS18 reads an electrical signal from the X-ray detector 12 corresponding to the X-ray dose detected by the X-ray detector 12. The DAS18 amplifies the read electrical signal and integrates (adds) the electrical signal over the viewing period to collect detection data having a digital value corresponding to the X-ray dose over the viewing period. The detection data is called projection data. The DAS18 is implemented, for example, by an application-specific integrated circuit (ASIC) equipped with circuit elements capable of generating projection data. The projection data is transmitted to the console 40 via a non-contact data transmission device or the like. Here, the DAS18 is an example of a data acquisition unit.

[0027] The detection data generated by DAS18 is transmitted via optical communication from a transmitter equipped with a light-emitting diode (LED) on the rotating frame 13 to a receiver equipped with a photodiode, located on the non-rotating part of the base 10 (for example, the fixed frame; not shown in Figure 1), and then forwarded to the console 40. The method of transmitting data from the rotating frame 13 to the non-rotating part of the base 10 is not limited to optical communication; any non-contact data transmission method or a contact-type data transmission method may be used.

[0028] The patient bed 30 is a device for placing and moving the subject P to be scanned, and comprises a base 31, a patient bed drive device 32, a top plate 33, and a support frame 34. The base 31 is a housing that supports the support frame 34 so that it can move vertically. The patient bed drive device 32 is a drive mechanism that moves the top plate 33 in the longitudinal direction (Z-axis direction) of the top plate 33, and includes a motor and actuators. The top plate 33 is a plate on which the subject P is placed. The top plate 33 is provided on the upper surface of the support frame 34. The top plate 33 can protrude from the patient bed 30 toward the frame 10 so that the entire body of the subject P can be photographed. The top plate 33 is made of, for example, carbon fiber reinforced plastic (CFRP) which has good X-ray transparency and physical properties such as rigidity and strength. Also, for example, the inside of the top plate 33 is hollow. The support frame 34 supports the top plate 33 so that it can move in the longitudinal direction of the top plate 33. Here, the bed 30 is an example of a medical bed device.

[0029] The console 40 includes a memory 41, a display 42, an input interface 43, and a processing circuit 44. Data communication between the memory 41, the display 42, the input interface 43, and the processing circuit 44 is performed via a bus (BUS). Although the console 40 is described separately from the mounting base 10, the mounting base 10 may include the console 40 or some of its components.

[0030] Memory 41 can be implemented using, for example, semiconductor memory elements such as RAM (Random Access Memory) or flash memory, a hard disk, or an optical disk. For example, memory 41 stores projection data and reconstructed image data. Memory 41 also stores, for example, imaging protocols according to the area and purpose of the examination. Furthermore, memory 41 stores, for example, various programs. The storage area of ​​memory 41 may be located within the X-ray CT device 1 or in an external storage device connected via a network. Here, memory 41 is an example of a storage unit.

[0031] Here, an imaging protocol defines the scan sequence and various conditions for a series of CT scans, including at least one scan, defined for a specific purpose. In the following explanation, the imaging protocol may also be referred to as a scan plan. Furthermore, the imaging protocol may sometimes simply be referred to as a protocol.

[0032] The display 42 displays various types of information. For example, the display 42 outputs medical images (CT images) generated by the processing circuit 44, and a GUI (Graphical User Interface) for receiving various operations from the operator. The GUI for receiving various operations from the operator includes various operation screens related to setting reconstruction conditions for multiple scans included in the imaging protocol. In the following description, editing the imaging protocol may also be referred to as protocol editing. Various arbitrary displays can be used as the display 42 as appropriate. For example, a liquid crystal display (LCD), a cathode ray tube (CRT) display, an organic electroluminescent display (OELD), or a plasma display can be used as the display 42. Here, the display 42 is just one example of a display unit.

[0033] The display 42 may be installed anywhere in the control room. Alternatively, the display 42 may be installed on the stand 10. Furthermore, the display 42 may be a desktop type, or it may consist of a tablet terminal or the like that can communicate wirelessly with the console 40. Also, one or more projectors may be used as the display 42.

[0034] The input interface 43 receives various input operations from the operator, converts the received input operations into electrical signals, and outputs them to the processing circuit 44. The input interface 43 receives, for example, data acquisition conditions when acquiring projection data, reconstruction conditions when reconstructing CT images, and image processing conditions when generating post-processed images from CT images from the operator. The input interface 43 also receives, for example, various input operations from the operator on various operation screens related to setting reconstruction conditions. Here, the input interface 43 is an example of an input unit.

[0035] The input interface 43 can be, for example, a mouse, keyboard, trackball, switch, button, joystick, touchpad, or touch panel display, as appropriate. However, in this embodiment, the input interface 43 is not limited to those equipped with these physical operating components. For example, an electrical signal processing circuit that receives an electrical signal corresponding to an input operation from an external input device provided separately from the device and outputs this electrical signal to the processing circuit 44 is also included as an example of the input interface 43. Furthermore, the input interface 43 may be provided on the stand 10. In addition, the input interface 43 may consist of a tablet terminal or the like that can communicate wirelessly with the console 40 main unit.

[0036] The processing circuit 44 controls the operation of the entire X-ray CT apparatus 1. The processing circuit 44 has a processor and memory such as ROM or RAM as hardware resources. The processing circuit 44 executes system control functions 45, image generation functions 46, image processing functions 47, and display control functions 48, etc., using the processor that executes programs loaded into memory. Here, the processing circuit 44 is an example of a processing unit.

[0037] In the system control function 45, the processing circuit 44 controls various functions of the processing circuit 44 based on input operations received from the operator via the input interface 43.

[0038] For example, the processing circuit 44 controls the creation, editing, and deletion of preset imaging protocols and imaging protocols for examinations based on input operations received from the operator via the input interface 43. For example, the processing circuit 44 controls the imaging of the subject P according to the selected protocol displayed in the protocol display area of ​​the scan execution screen (see, for example, Figure 7).

[0039] In the image generation function 46, the processing circuit 44 generates data by applying preprocessing such as logarithmic transformation, offset correction, inter-channel sensitivity correction, and beam hardening correction to the detection data output from the DAS 18. The processing circuit 44 stores the generated data in the memory 41. Note that the data before preprocessing (detection data) and the data after preprocessing are sometimes collectively referred to as projection data. The processing circuit 44 generates CT image data by performing reconstruction processing using filtered back projection, iterative reconstruction, machine learning, etc., on the generated projection data (projection data after preprocessing). The processing circuit 44 stores the generated CT image data in the memory 41.

[0040] In the image processing function 47, the processing circuit 44 converts the CT image data generated by the image generation function 46 into tomographic image data or 3D image data of an arbitrary cross-section using a known method, based on input operations received from the operator via the input interface 43. For example, the processing circuit 44 applies 3D image processing such as volume rendering, surface rendering, image value projection processing, MPR (Multi-Planar Reconstruction) processing, and CPR (Curved MPR) processing to the CT image data to generate rendered image data in an arbitrary viewpoint direction. Note that the generation of 3D image data such as rendered image data in an arbitrary viewpoint direction may be performed directly by the image generation function 46. The processing circuit 44 stores the tomographic image data or 3D image data in the memory 41.

[0041] Furthermore, in the image processing function 47, the processing circuit 44 generates image data for displaying various display screens related to the setting of reconstruction conditions for multiple scans included in the imaging protocol. In the following description, the setting of reconstruction conditions for multiple scans included in the imaging protocol may also be referred to as "condition setting."

[0042] In the display control function 48, the processing circuit 44 displays images on the display 42 based on various image data generated by the image processing function 47. The images displayed on the display 42 include CT images based on CT image data, cross-sectional images based on cross-sectional image data of an arbitrary cross-section, and rendering images of an arbitrary viewpoint based on rendering image data of an arbitrary viewpoint direction. The images displayed on the display 42 also include images for displaying operation screens and images for displaying notifications and warnings to the operator. The operation screens include various display screens related to protocol selection and reconstruction condition settings. Here, the processing circuit 44 that implements the display control function 48 is an example of a display control unit.

[0043] Furthermore, each of the functions 45-48 is not limited to being implemented in a single processing circuit. Multiple independent processors may be combined to form a processing circuit 44, and each processor may execute its respective program to realize each of the functions 45-48. Here, each of the functions 45-48 may be implemented by being appropriately distributed or integrated across one or more processing circuits.

[0044] Although console 40 has been described as a single console that executes multiple functions, it is also acceptable for multiple functions to be executed by separate consoles. For example, the functions of processing circuits 44, such as the image generation function 46 and the image processing function 47, may be distributed among multiple consoles.

[0045] Furthermore, the processing circuit 44 is not limited to being included in the console 40; it may also be included in an integrated server that performs processing on detection data acquired by multiple medical imaging diagnostic devices in a unified manner.

[0046] Post-processing may be performed on either the console 40 or an external workstation. Alternatively, processing may be performed simultaneously on both the console 40 and the workstation. As a workstation, a computer with hardware resources such as a processor for implementing image generation functions 46 and image processing functions 47, and memory such as ROM or RAM, can be used as appropriate.

[0047] Although not shown in Figure 1, when imaging is performed while injecting a contrast agent in the X-ray CT scanner 1, the contrast agent injection device and the processing circuit 44 are connected in a communication manner, and imaging is performed in conjunction with the timing of contrast agent injection by the injection device and the timing of imaging by the X-ray CT scanner 1.

[0048] In the reconstruction of X-ray CT image data, either the full-scan reconstruction method or the half-scan reconstruction method may be applied. For example, in the reconstruction processing function 444, the processing circuit 44 uses projection data for 360 degrees around the subject P in the full-scan reconstruction method. In the half-scan reconstruction method, the processing circuit 44 uses projection data for 180 degrees plus the fan angle. In this embodiment, for the sake of simplicity of explanation, the processing circuit 44 will use the full-scan reconstruction method, which reconstructs using projection data for 360 degrees around the subject P.

[0049] Furthermore, the technology according to this embodiment can be applied to various types of X-ray CT scanners 1, such as third-generation CT and fourth-generation CT. Here, third-generation CT is a Rotate / Rotate-Type in which the X-ray tube and detector rotate together around the subject. Fourth-generation CT is a Stationary / Rotate-Type in which a large number of X-ray detection elements are fixed in a ring-shaped array, and only the X-ray tube rotates around the subject.

[0050] Furthermore, the technology according to this embodiment can be applied to both single-tube X-ray computed tomography (CT) systems and so-called multi-tube X-ray computed tomography systems, which have multiple pairs of X-ray tubes and detectors mounted on a rotating ring.

[0051] In this embodiment, an X-ray CT apparatus 1 equipped with an integrating type X-ray detector 12 is described as an example, but the technology according to this embodiment can also be realized as an X-ray CT apparatus 1 equipped with a photon counting type X-ray detector.

[0052] Furthermore, the X-ray CT apparatus 1 according to this embodiment may be configured as an upright CT. In this case, instead of moving the tabletop 33, a support part may be provided that supports the upright subject P and is configured to move along the rotation axis of the rotating part of the stand 10, or the tabletop 33 or the patient's table 30 may not be provided at all. In addition, the X-ray CT apparatus 1 according to this embodiment may be configured as a mobile CT or dental CT in which the stand 10 and patient's table 30 are movable.

[0053] This embodiment describes the case in which an X-ray CT scanner 1 is used as the medical imaging diagnostic device, but is not limited to this. The technology of this embodiment is applicable to other medical imaging diagnostic devices such as MRI scanners, PET scanners, SPECT scanners, X-ray diagnostic devices, and ultrasound diagnostic devices. In this case, the control circuit of each medical imaging diagnostic device realizes the same functions as the processing circuit 44 of this embodiment.

[0054] Furthermore, the various controls related to condition setting according to this embodiment are not limited to being implemented in the console 40 of the X-ray CT apparatus 1, but may also be implemented by an external workstation, PACS viewer, or a combination thereof. Alternatively, the X-ray CT apparatus 1 may be provided with a stand 10 and a patient table 30, and a common control device for multiple medical imaging diagnostic devices within the hospital, including the X-ray CT apparatus 1, may implement some of the functions of the console 40 described above. In this case, for example, the console 40 has an input interface 43 and a display 42 that displays screen displays or GUI images from the control device. Input from the input interface 43 is sent to the control device via a communication network through a communication circuit (not shown) of the console 40, the input is processed by the control device, reconstruction conditions are set according to the input, and the updated GUI image according to the input is output by the control device's communication circuit and received by the console 40's communication circuit. In this case, the GUI described later will be partially implemented by the control device. The division of functions between the console 40 and the control device is not limited to this; the console 40 may update the GUI image in response to input, while the control device may change or update the shooting conditions, scan plan, and protocol information in response to the input or the update of the GUI image. The device that realizes the display control related to editing the shooting protocol, including the setting of reconstruction conditions according to this embodiment, is an example of a medical information display control device.

[0055] The setting of reconstruction conditions for the imaging protocol in diagnostic imaging using a medical imaging device such as the X-ray CT scanner 1 according to this embodiment will be described in more detail below with reference to the drawings.

[0056] In diagnostic imaging using medical imaging equipment such as X-ray CT scanner 1, the operator of the medical imaging equipment (e.g., a technician or radiologist) determines the content of the examination based on the examination order sent by the attending physician and performs the examination. At this time, the operator may select the examination imaging protocol from a list that includes pre-created imaging protocols. Each imaging protocol in the list is pre-created as a general imaging protocol for a specific examination, based on, for example, hospital regulations or dose guidelines. Here, the imaging protocol includes, for example, positioning scans, non-contrast scans for each area, or contrast scans for each area. In other words, when X-ray CT image data is collected based on one imaging protocol, multiple scans are performed and X-ray CT image data corresponding to each scan is collected.

[0057] When creating an imaging protocol, it is sometimes necessary to set reconstruction conditions for multiple scans included in that protocol. In this case, the reconstruction conditions were set manually for each scan, which was time-consuming. Therefore, there is a need to simplify the operator's steps involved in setting reconstruction conditions.

[0058] Furthermore, if the optimal imaging protocol for the examination order or patient's condition is not listed, the operator may optimize the imaging protocol by loading a base protocol from the list and then performing operations such as adding scans or editing each condition. However, optimizing the imaging protocol requires adding scans or editing the conditions for each scan after loading the protocol. In other words, the operator edits the imaging conditions to set appropriate conditions for the added scans and existing scans. However, if the imaging conditions are changed, the reconstruction conditions also need to be optimized, so optimizing the imaging protocol increases the number of operations the operator has to perform to edit the imaging protocol.

[0059] For example, it may be possible to select a suitable imaging protocol by referring to the conditions of a different imaging protocol or previously used scans. However, when referring to the conditions of a different imaging protocol or previously used scans, it is necessary to set each condition one by one while referring to those conditions, and there is a need to simplify the operational steps involved in editing the imaging protocol for the operator.

[0060] Furthermore, the imaging protocol may be changed during the scan execution. In this case as well, as mentioned above, it is necessary to set appropriate reconstruction conditions for the modified scan, or between the modified scan and other scans, which increases the number of operations required for the operator to edit the imaging protocol.

[0061] Thus, if creating and editing imaging protocols is time-consuming, the throughput of image diagnosis using medical imaging diagnostic equipment will decrease. In this embodiment, as described below, a medical imaging diagnostic device such as an X-ray CT scanner 1 is disclosed that can reduce the operator's steps involved in setting reconstruction conditions when creating imaging protocols. In other words, in this embodiment, a medical imaging diagnostic device such as an X-ray CT scanner 1 is disclosed that can improve the throughput of image diagnosis.

[0062] The display screen shown on the display by the processing circuit 44 will be explained below with reference to Figures 2 to 8. This display screen is, for example, a screen for the user to set inspection conditions, etc., and can be operated in response to input from the input interface 43. The content displayed on the screen corresponds to the inspection information, and the content displayed on the screen is changed according to the user's operation input, and the inspection information is appropriately set by input, change, add, delete, etc. in accordance with this change.

[0063] Figures 2 to 6 show examples (1) to (5) of the protocol creation screen 170 displayed on the display 42 according to the embodiment.

[0064] The protocol creation screen 170 is an operation screen for presetting imaging protocols. More specifically, the protocol creation screen 170 is an operation screen for creating or modifying the imaging protocol to be selected as the selected protocol to be executed for subject P in the protocol creation screen 110 after registering subject P's information (patient information).

[0065] Figure 2 illustrates the initial state of the protocol creation screen 170. Figures 3 and 4 illustrate the state of the protocol creation screen 170 while a protocol is being displayed. In the protocol creation screen 170 shown in Figures 2 to 4, the processing circuit 44 displays the protocol selection area 300 and the protocol display area 500.

[0066] In the protocol selection area 300, the processing circuit 44 displays an attribute selection unit 310 for setting patient attributes such as "Adult" or "Child," as shown in Figure 2. The processing circuit 44 also displays a site selection unit 330 for setting examination sites such as "Whole," "Head," "Neck," "Chest," "Abdomen," "Pelvis," "Leg," or "Arm," as shown in Figure 2. Here, the processing circuit 44 highlights and displays the selected patient attributes or examination sites.

[0067] In the protocol selection area 300, the processing circuit 44 displays a list of preset imaging protocols applicable to the area selected in the area selection unit 330 in the list display area 350, for example, as shown in Figure 2. In the following description, the list of imaging protocols may also be simply referred to as the protocol list. In the list display area 350, the processing circuit 44 displays an icon 351 corresponding to each of the at least one preset imaging protocols valid for the set patient attributes and examination area, for example, as shown in Figure 2. "Helical" is an icon 351 indicating a protocol for performing a normal helical CT scan. "Subtraction" is an icon 351 indicating a protocol for obtaining a difference image of images obtained from two scans performed before and after the injection of contrast agent. For simplicity of explanation, the display of imaging protocols as icons 351 may be simply referred to as "imaging protocols" in the following description. Also, imaging protocols as imaging information corresponding to icons 351 may be described simply as icons 351.

[0068] Furthermore, in the protocol selection area 300, the processing circuit 44 displays an icon 355 indicating a new protocol in the list display area 350, for example, as shown in Figure 2. The operator selects the icon 355 indicating a new protocol to start creating the protocol. At this time, the processing circuit 44 identifies the icon 351 of the created shooting protocol as the display position, for example, after the shooting protocol has been created by subsequent processing, in response to the operator's selection of the icon 355 indicating a new protocol.

[0069] For example, on the protocol creation screen 170, the operator can select the icon 355 indicating a new protocol displayed in the list display area 350, and then drag and drop the icon 351 representing the desired shooting protocol from among the multiple preset shooting protocol icons 351 to the protocol display area 500. The drag and drop operation may be performed using a mouse or a touch panel.

[0070] At this time, the processing circuit 44, based on the input operation received from the operator via the input interface 43, displays the icon 351 of the selected shooting protocol in the protocol selection area 300 as an indicator of the active state, highlighting it compared to other parts. The processing circuit 44 also displays the shooting protocol indicated by the selected icon 351 as the selected protocol icon 510a (icon 510) in the protocol display area 500.

[0071] The operator's operation to select an icon 351 of a desired shooting protocol from the protocol selection area 300 and display it in the protocol display area 500 is not limited to drag-and-drop operations; other methods may also be used. For example, on the protocol creation screen 170, the operator single-clicks the icon 351 of the shooting protocol they want to select from the list display area 350 displayed in the protocol selection area 300. Then, with the icon 351 of the selected shooting protocol highlighted, the operator single-clicks the protocol display area 500. At this time, the processing circuit 44, based on the input operation received from the operator via the input interface 43, displays the single-clicked shooting protocol icon 351 in the protocol selection area 300 as active. When the protocol display area 500 is clicked, the detailed information of the active shooting protocol icon 351, i.e., the selected protocol icon 510, is displayed in the clicked protocol display area 500.

[0072] In the protocol display area 500, the processing circuit 44 displays an icon 510 (icon 510a) that shows detailed information of the selected shooting protocol, for example, as shown in Figure 3. In the following description, the selected shooting protocol may also be simply referred to as the selected protocol. The processing circuit 44 displays information indicating the elements that constitute the shooting protocol, such as operator operations and scans included in the selected protocol, as the icon 510 that shows detailed information of the selected protocol, arranged in chronological order (execution order), for example, from left to right on the screen as shown in Figure 3.

[0073] The processing circuit 44 displays, for example, as shown in Figure 3, an exposure icon 511 indicating the ON operation of the exposure switch and an icon 515 indicating the injection of contrast agent as information indicating the operator's operation regarding the imaging protocol indicated by the "Subtraction" icon 351. Below the exposure icon 511, a start mode icon 512 is displayed for setting the start mode. Setting the start mode means setting from where the exposure switch can be pressed to start the scan, and the location where the exposure switch is pressed can be selected, for example, a "control pad," a "stand," or a "hand switch."

[0074] Furthermore, the processing circuit 44 displays scan icons 513 as information indicating the scans included in the selected protocol, such as "S-Helical," "Non-CE," "Real Prep (CT fluoroscopy with contrast agent monitoring)," and "Arterial (arterial phase imaging)," which are included in the imaging protocol indicated by the "Subtraction" icon 351, as shown in Figure 3. Thus, each imaging protocol includes at least one scan.

[0075] Each scan icon 513 displays information about the scan in a specific format using text or images. For example, in Figure 3, within a roughly rectangular frame 531, the scan name is displayed in the upper area 532, and the scan type is displayed in text and icons in the lower, central area 533. Figure 3 shows examples of scan types displayed in text and icons in area 5133, such as "S-Helical (helical imaging for positioning or scanogram imaging)," "Sub-Helical (helical imaging for subtraction)," and "Reap-Prep." In the lower area 534, the word "Link" is displayed to indicate that the conditions between scans are synchronized, along with an icon indicating the type of condition to be synchronized. For example, each "Non-CE" scan icon 513 displays an icon 5341 indicating that the Z-axis range is linked within the scan range or reconstruction range, and an icon 5342 indicating that the size (FOV: Field of View) is linked within the scan range or reconstruction range. "S-Helical" is a scanogram, and the "Link" indicator is not displayed, meaning that the shooting conditions are not linked. Within the "Arterial" scan frame, the "Link" indicator is displayed, meaning that the shooting conditions are linked, and icon 5341 is displayed to indicate that the shooting range in the Z direction is subject to linking. For "Real Prep" scans, icon 5343 is displayed next to the "Link" indicator, indicating a mode that executes under specific conditions so that the subsequent scan (in this case, the "Arterial" scan) can be started as soon as possible after the Prep.

[0076] Furthermore, the bottommost area 535 displays the time required for the scan.

[0077] The roughly rectangular frame 531 has triangular protrusions 536 on its left and right sides. Speaker icons 5361 are displayed at these positions, and the presence or absence of announcement audio is indicated by the type of icon 5361 at the start (left side) and end (right side) of the scan.

[0078] Furthermore, the processing circuit 44 displays a linking icon 517 between consecutively executed elements among the elements included in the selected protocol icon 510, as shown in Figure 3. The processing circuit 44 also displays an icon 519 indicating the range of the selected protocol. Figure 3 illustrates a rectangular frame as the icon 519. Note that the icon 519 indicating the range of the selected protocol does not necessarily have to be displayed.

[0079] The scan icon 513, exposure icon 511, start mode icon 512, link icon 517, and various icons displayed within the frame of the scan icon 513 can be changed in response to user input on those icons, and various conditions related to the protocol can be changed in response to such input. For example, clicking the link icon 517 for "Real-Prep" will display a link between the "Real-Prep" scan and the "Non-CE" scan (similar to the display between "Real-Prep" and "Arterial"), and the linked scan can be automatically executed as appropriate in response to the press of the exposure switch at the start of Non-CE. The start timing of subsequent scans among the linked scans can be set as the elapsed time from the preceding event. For example, the start timing of subsequent scans can be set by setting the elapsed time from the press of the irradiation switch, the start or end of the "Non-CE" scan, etc. Such settings can also be set in response to user input on the protocol display area 500.

[0080] While Figures 2 and 3 describe how the contents of the shooting protocol can be viewed on the protocol creation screen 170 by displaying the icon 510 indicating the selected protocol using drag-and-drop operations, this is not the only way. The contents of the shooting protocol indicated by icon 351 may also be displayed in the following manner.

[0081] In the protocol selection area 300, the processing circuit 44 displays the scan list 353 as shown in Figure 4. The scan list 353 shows the scans included in the imaging protocol selected by the operator from the list display area 350. For example, as shown in Figure 4, the processing circuit 44 displays icons representing each scan included in the imaging protocol indicated by the "Contrast 3Phase" icon 351 as the scan list 353. In the example in Figure 2, the scan list 353 includes icons representing the scans "S-Helical", "Real Prep", "Helical", "Helical", and "Helical".

[0082] For example, the operator single-clicks the highlighted icon 351 of the shooting protocol they wish to select. At this time, the processing circuit 44 pops out and displays the scan list 353 of the shooting protocol indicated by the clicked active icon 351, based on the input operation received from the operator via the input interface 43. The operator can also select a scan included in the shooting protocol indicated by the icon 351, i.e., a scan in the scan list 353, in the same manner as operating on the icon 351 in the list display area 350. The processing of the processing circuit 44 is also similar.

[0083] In addition, the pop-up display of the scan list 353 may show only the scan name, as illustrated in Figure 4, or it may be displayed in the same format as the protocol display area 500 shown in Figures 2 and 3.

[0084] In this way, the operator can also perform a quick check by double-clicking the icon 351 of the shooting protocol they want to check in the list display area 350 to display the scan list 353 in a pop-up window.

[0085] Furthermore, while the detailed information of the protocol is displayed by the scan list 353, it is also possible to add, insert, replace, or delete other imaging protocols. Here, referring to Figure 4, we will explain using the example of selecting the icon 351 for the "Contrast 3Phase" imaging protocol in the protocol creation screen 110 of Figure 3.

[0086] As an example, the operator drags and drops the icon 351 of the desired "Contrast 3Phase" imaging protocol onto the protocol display area 500. When the processing circuit 44 detects the start of a drag-and-drop operation related to icon 351 based on the input operation received from the operator via the input interface 43, it displays icons 521 (521a to 521d) in the protocol display area 500 indicating positions where icons 510, which show detailed information of the imaging protocol, can be inserted. Figure 4 illustrates icon 521 with a solid line. This allows the operator to easily understand the position where they can insert the icon 510 corresponding to the "Contrast 3Phase" imaging protocol when they start a drag-and-drop operation.

[0087] For example, the operator drops the icon 351 for the "Contrast 3Phase" imaging protocol into the rear area of ​​the protocol display area 500 (the position of icon 521d and its right side in Figure 4). At this time, the processing circuit 44 adds the "Contrast 3Phase" icon 510b after (at the end of) the "Subtraction" icon 510a and displays it, as shown in Figure 4.

[0088] The operator can also drop the "Contrast 3Phase" icon 351 into the space 523 at the top of the protocol display area 500. In this case, the processing circuit 44 replaces the currently displayed "Subtraction" icon 510a with the "Contrast 3Phase" icon 510b.

[0089] Furthermore, the operator can also drop the "Subtraction" icon 510a currently displayed in the protocol display area 500 onto the edge of the protocol creation screen 170 or onto the list display area 350. In this case, the processing circuit 44 removes the displayed "Subtraction" icon 510a from the protocol display area 500. The processing circuit 44 may also separately display an icon on the protocol creation screen 170 indicating the drop destination for deleting the icon 510 of the selected protocol from the protocol display area 500.

[0090] Furthermore, when the operator combines multiple shooting protocols, they can rearrange the icons 510 (icons 510a and 510b in Figure 4) of the selected protocol currently displayed in the protocol display area 500, for example, by drag-and-drop. At this time, as described above, when the processing circuit 44 detects the start of a drag-and-drop operation related to the icons 510 in the protocol display area 500 based on the input operation received from the operator via the input interface 43, it displays icons 521 (521a to 521d) in the protocol display area 500 indicating positions where icons 510 corresponding to the shooting protocols can be inserted.

[0091] Note that while Figure 4 illustrates protocol editing on a per-protocol basis, such as adding or inserting shooting protocols into the protocol display area 500, and replacing, moving (rearranging), or deleting selected protocols currently displayed, the possibilities are not limited to these. For example, scans included in a shooting protocol can be added or inserted on a per-scan basis within the protocol display area 500 using operations such as drag and drop. Similarly, icons for each scan included in the icons 510 (510a, 510b) displayed in the protocol display area 500 can be replaced, moved (rearranged), or deleted on a per-scan basis.

[0092] Furthermore, the processing circuit 44 may, in response to the operator's input, disconnect the connections between scans that are set to be executed consecutively, for example, as shown by the connection icon 517 in Figure 3, among the scan icons 513. In this case, the operator can also insert at the position of the connection icon 517, whether at the protocol unit or the scan unit level.

[0093] When the operator selects the "Edit" button 225 on the protocol creation screen 170 in Figures 3 and 4, the displayed screen transitions to the protocol creation screen 170 in Figure 5.

[0094] Figure 5 illustrates the state of the protocol creation screen 170 after the protocol has been loaded. In the protocol creation screen 170 of Figure 5, the processing circuit 44 displays the protocol display area 500 and the scan information display area 700.

[0095] When the operator selects the "Edit" button 225 while the icon 510 of the selected protocol is displayed in the protocol display area 500, the processing circuit 44 reads the selected protocol indicated by the icon 510 displayed in the protocol display area 500, as shown in Figure 5.

[0096] The operator can perform protocol editing operations such as adding, inserting, replacing, and deleting the imaging protocol icons 351 on the protocol creation screen 170 in Figure 5. The processing circuit 44 may also display an icon 522 indicating a position where the scan icon 513 can be inserted. Alternatively, icon 521 may be displayed instead of icon 522. Furthermore, icon 522 may be displayed on the protocol creation screen 170 in Figures 3 and 4.

[0097] In the imaging information display area 750, the processing circuit 44 displays information indicating the scan range 791 (791a, 791b), scan direction information 792, and body position information 793 on a human body image 790, such as a human body model or a subject image, as shown in Figure 5. The processing circuit 44 also displays images obtained from scanogram imaging (positioning imaging) in the scan information display area 700, allowing the user to set the scan range. Furthermore, in the scan execution screen 130 described later, during or after scanning, the image obtained by the scan is displayed for the user to confirm.

[0098] Furthermore, the processing circuit 44 displays various scan-related information, such as scan condition information 776 and reconstruction condition information 777, in the detailed condition display area 775 of the imaging information display area 750, for example, as shown in Figure 5. In the example in Figure 5, the scan condition information 776 includes tabs indicating the scan range "0.5mm × 80", scan speed "Fast", tube voltage [kV] "120", tube current [mA] "80", and rotation speed "0.5s / r". Also in the example in Figure 5, the scan condition information 776 includes the display of dose indices "CTDI (Computed Tomography Dose Index) vol 0.7mGy" and "DLP (Dose Length Product) 3.71 mGy.cm". Also in the example in Figure 5, the reconstruction condition information 777 includes an icon indicating the "Body" condition.

[0099] Here, we will explain the setting of synchronized scan ranges. For example, in the protocol creation screen 170 shown in Figures 3 to 5, the processing circuit 44 controls the display / hide of the word "Link" to indicate that the conditions between scans are synchronized, in response to the operator's input to the area 534 of each scan icon. In other words, the processing circuit 44 performs a scan range synchronization setting (first synchronization setting) indicating whether or not to synchronize the scan ranges between CT scans, in response to the operator's input.

[0100] For example, the operator selects at least one scan icon 513 and then inputs an operation to display an icon 5341 indicating that the range in the Z direction is linked to the area 534 of the scan icon 513. For example, the processing circuit 44 performs a linkage setting (first linkage setting) to link the range in the Z direction of the scan range among the scan conditions of the scan indicated by one scan icon 513 selected by the operator to other scans included in icon 510. At this time, when the scan range of another scan included in icon 510 is changed, the processing circuit 44 applies the changed scan range to the linked scan. For example, the processing circuit 44 performs a linkage setting (first linkage setting) to link the range in the Z direction of the scan range among the scan conditions between at least two scans selected by the operator. At this time, when the scan range of one of the linked scans is changed, the processing circuit 44 applies the changed scan range to the other linked scans.

[0101] For example, the operator selects at least one scan icon 513 and then inputs an operation to display an icon 5342 indicating that the size (FOV) of the scan icon 513's area 534 should be linked. For example, the processing circuit 44 performs a linkage setting (first linkage setting) to link the scan range size (FOV) of the scan condition of the scan indicated by one scan icon 513 selected by the operator to other scans included in icon 510. At this time, when the scan range of another scan included in icon 510 is changed, the processing circuit 44 applies the changed scan range to the linked scan. For example, the processing circuit 44 performs a linkage setting (first linkage setting) to link the scan range size (FOV) of the scan condition between at least two scans selected by the operator. At this time, when the scan range of one of the linked scans is changed, the processing circuit 44 applies the changed scan range to the other linked scans.

[0102] Thus, the CT scan control method according to the embodiment includes a scan range linkage setting (first linkage setting) that indicates whether or not to link the scan ranges between at least two scans. In the CT scan control method according to the embodiment, if the scan range linkage setting is enabled, the processing circuit 44 sets the scan range of the other linked CT scans according to the scan range set for one of the at least two linked CT scans. On the other hand, if the scan range linkage setting is disabled, the processing circuit 44 sets the scan ranges independently among the multiple scans included in the imaging protocol.

[0103] Here, the scan range adjustment function 791 according to one embodiment will be described with reference to Figure 5. For example, when the input interface 43 includes a mouse, a situation is assumed in which the scan range is adjusted using the mouse. Note that the human body image 790, including the front image 790a and the side image 790b, may use a human body model before scannography and the subject image obtained from the scannography after scannography. When helical scanning or a conventional scan (volume scan) without movement of the bed 30 is performed as a scannogram, the processing circuit 44 may generate front image data and side image data from the 3D image obtained from the scan and display the front image 790a and side image 790b on the display 42.

[0104] In Figure 5, the size adjustment of the scan ranges 791a and 791b is mainly done in the Z and X directions for the front image 790a, and in the Z and Y directions for the side image 790b. On the other hand, when adjusting the position of the shooting area, it is convenient to make the frame indicating the shooting area movable in any direction. When the frame indicating the shooting area is selected, while the first mouse button is pressed (e.g., right click), the processing circuit 44 moves the frame in any direction according to the direction of mouse movement. On the other hand, while the second mouse button is pressed (e.g., left click), the processing circuit 44 performs display control to move the frame only up and down on the screen, or only left and right. This control is performed by extracting the vertical component or the horizontal component from the direction of mouse movement and moving according to that component.

[0105] The selection between the up / down and left / right directions is determined by, for example, selecting the direction in which movement exceeds a predetermined amount first after the start of the second button operation. For example, in response to the second button operation, the vertical displacement and left / right displacement are accumulated separately during the operation, and the direction in which the accumulated amount first exceeds a predetermined threshold is selected as the direction of movement. If the up / down direction is selected, the movement of the frame in response to the mouse may be restricted (for example, not moved) during the accumulation period. If the first direction of movement (for example, the up / down direction) is selected, the processing circuit 44 moves the frame in the first direction of movement in accordance with the mouse operation direction while restricting its movement in the second direction of movement (left / right direction). If the second direction of movement is selected, the processing circuit 44 moves the frame in the second direction of movement in accordance with the mouse operation direction while restricting its movement in the first direction of movement. In response to the end of the second button operation, the processing circuit 44 releases the restriction on the direction of movement. This control allows for more efficient adjustment of the scan ranges 791a and 791b.

[0106] Furthermore, the processing circuit 44 displays, for example, an icon 7761 indicating an enlarged view of the scan conditions when displaying the scan condition information 776, as shown in Figure 5. Similarly, the processing circuit 44 displays, for example, an icon 7771 indicating an enlarged view of the reconstruction conditions when displaying the reconstruction condition information 777, as shown in Figure 5.

[0107] When the operator selects the icon 7771, which indicates an enlarged view of the reconstruction conditions, on the protocol creation screen 170 in Figure 5, the display screen transitions to the protocol creation screen 170 in Figure 6.

[0108] Figure 6 illustrates an enlarged view of the detailed conditions display area 775 of the protocol creation screen 170. In the protocol creation screen 170 of Figure 6, the processing circuit 44 displays the protocol display area 500 and the scan information display area 700, and also enlarges the detailed conditions display area 775.

[0109] Note that the protocol creation screen 170 in Figure 6 illustrates a state where, in the protocol creation screen 170 of Figure 5, the scan icon 513 indicating an "Arterial" scan (not "S-Helical") is selected and activated, and the operator has selected the icon 7771 indicating an enlarged view of the reconstruction conditions.

[0110] In response to the operator selecting the icon 7771 indicating an enlarged view of the reconstruction conditions, the processing circuit 44 expands a tab displaying the reconstruction condition information 777 into the detailed condition display area 775.

[0111] Furthermore, when the operator selects the icon 7761 indicating an enlarged view of the scan conditions on the protocol creation screen 170 in Figure 5, or when the operator selects the icon 7761 indicating an enlarged view of the scan conditions while the tab displaying reconstruction condition information 777 is expanded in the detailed condition display area 775 of the protocol creation screen 170 in Figure 6, the tab displaying scan condition information 776 is expanded in the detailed condition display area 775 of the protocol creation screen 170 in Figure 6. Note that the linked scan range settings and scan range adjustments described above, referring to Figure 5, can also be performed on the protocol creation screen 170 in Figure 6 even when the tab displaying scan condition information 776 is expanded in the detailed condition display area 775.

[0112] In the tab displaying scan condition information 776, the processing circuit 44 displays the details of the reconstruction conditions for the selected "Arterial" scan on the display 42, for example, as shown in Figure 6. Specifically, the tab displaying reconstruction condition information 777 displays reconstruction icons 7763 and 7764, and an icon for adding reconstruction conditions 7765.

[0113] Reconstruction icons 7763 and 7764 indicate the preset reconstruction conditions for the selected "Arterial" scan, respectively. In the example shown in Figure 6, reconstruction icon 7764 (reconstruction condition) labeled "CTA Body (CT Angiography (imaging method), Body (abdomen)) Enhance (image processing name)" is selected. In other words, the tab displaying scan condition information 776 in Figure 6 shows detailed information about the reconstruction condition indicated by reconstruction icon 7764, such as condition 7773, intensity (level) 7775, and detailed condition 778.

[0114] Furthermore, the processing circuit 44 may display information showing details of other reconstruction conditions, such as condition 7773, intensity (level) 7775, and detailed condition 778, in response to the operator's input to the scroll icon 780 on the tab that displays the reconstruction condition information 777.

[0115] The reconstruction condition addition icon 7765 is an icon for adding a reconstruction icon that indicates a new reconstruction condition. For example, the processing circuit 44 starts processing related to adding a reconstruction icon (reconstruction condition) in response to an operation input such as a single click on the reconstruction condition addition icon 7765 by the operator. At this time, the processing circuit 44 sets the reconstruction icon (reconstruction condition) in response to the operator's operation input for condition 7773, intensity (level) 7775, and detailed condition 778, and adds it as a preset. Alternatively, the processing circuit 44 displays the details of the reconstruction condition indicated by the dragged and dropped reconstruction icons 7763 and 7764 in response to an operation input of dragging and dropping reconstruction icons 7763 and 7764 onto the reconstruction condition addition icon 7765, adjusts the reconstruction condition in response to the operation input for condition 7773, intensity (level) 7775, and detailed condition 778, sets a reconstruction icon (reconstruction condition) indicating the adjusted reconstruction condition, and adds it as a preset.

[0116] Here, we will explain the setting of linked reconstruction ranges. The processing circuit 44 controls the display / hide of the word "Link" in the protocol creation screen 170 of Figure 6, for example, in response to the operator's input for the area 534 of each scan icon, indicating that the settings are configured to synchronize the conditions between scans. In other words, the processing circuit 44 performs a linked reconstruction range setting (second linked setting) in response to the operator's input, indicating whether or not to link the reconstruction range, which is the range of image reconstruction for the scan data obtained from imaging of subject P, between CT scans.

[0117] The operations related to the linked reconstruction range settings and the corresponding processes are the same as those for the linked scan range settings described above, so a detailed explanation will be omitted. Note that, unlike the linked scan range settings, the icon 5343 indicating a mode that executes the subsequent scan (the "Arterial" scan in the examples of Figures 3-5) under specific conditions to start as soon as possible after Prep is not displayed in the linked reconstruction range settings. Furthermore, the operations related to adjusting the reconstruction range and the corresponding processes are the same as those for the linked scan range settings described above, so a detailed explanation will be omitted.

[0118] Thus, the CT scan control method according to the embodiment includes a reconstruction range linkage setting (second linkage setting) that indicates whether or not to link the reconstruction ranges between at least two scans. In the CT scan control method according to the embodiment, if the setting to link the reconstruction ranges is enabled, the processing circuit 44 sets the reconstruction range of the other linked CT scans according to the reconstruction range set for one of the at least two linked CT scans. On the other hand, if the setting to link the reconstruction ranges is disabled, the processing circuit 44 sets the reconstruction ranges independently among the multiple scans included in the imaging protocol.

[0119] If the operator wants to register the series of selected protocols indicated by the icon 510 displayed in the protocol display area 500 of the protocol creation screen 170 in Figure 5 or Figure 6 as a preset for the shooting protocol, they select the "Save" button 227. In this case, the processing circuit 44 registers the series of selected protocols indicated by the icon 510 displayed in the protocol display area 500 as a preset for the shooting protocol, displaying it as icon 351. If the operator wants to finish creating a protocol, they select the "Close" button 229. In this case, the processing circuit 44 closes the display of the protocol creation screen 170 in response to the selection of the "Close" button 229.

[0120] The example given shows the scan range and reconstruction range being set independently in the protocol creation screen 170, where the imaging protocol is preset, but this is not the only example. Similarly, the scan range and reconstruction range can also be set independently in the protocol editing screen, which is the operation screen for selecting, editing, and adjusting the protocol to be used for the examination.

[0121] The protocol editing screen includes the protocol display area 500 described above. The protocol display area 500 of the protocol editing screen displays the contents of the protocol in the same manner as those displayed in the protocol creation screen 170 and the scan execution screen 130 described later. The protocol editing screen may also be referred to as the protocol adjustment screen.

[0122] While the detailed conditions for each scan included in the imaging protocol are mainly adjusted in the next phase after protocol editing (protocol adjustment), namely the scan execution screen 130 (see Figures 7 and 8), the protocol editing screen is primarily used to set the overall flow of the protocol, such as the relationships between scans, the timing of pressing the irradiation switch, and the timing of contrast agent injection. Settings related to the progress of the scan, such as whether or not to include voice guidance before and after each scan, and settings that are unlikely to change throughout the protocol, such as whether to use head-first or foot-first body position, are also set on this screen. Here, "head-first" body position means entering the rig 10 headfirst. "Foot-first" body position means entering the rig 10 feet first. Furthermore, since imaging protocols are mainly associated with body parts, the selection of imaging areas is also done on this screen.

[0123] Figures 7 and 8 show examples (1) and (2) of the scan execution screen 130 displayed on the display 42 according to the embodiment, respectively.

[0124] For example, the operator can transition to the scan execution screen 130 while maintaining the display of the protocol display area 500 by operating the "Next" button or the like on the protocol editing screen described above. At this time, the processing circuit 44 reads the information to be displayed in the scan information display area 700, such as scan conditions, based on the operation input received from the operator via the input interface 43. After that, the processing circuit 44 displays the scan execution screen 130 and transitions the screen from the protocol editing screen.

[0125] On the scan execution screen 130, the processing circuit 44 displays the protocol display area 500 used for setting the protocol on the protocol editing screen, which is the display screen in the previous protocol selection phase, as shown in Figure 7. In other words, the multiple scan icons 513 displayed in the protocol display area 500 of the scan execution screen 130 indicate multiple scans to be performed on the subject P.

[0126] Furthermore, the processing circuit 44 displays a scan information display area 700, which includes an imaging information display area 750 and a detailed conditions display area 775, similar to the protocol creation screen 170 in Figure 5. In addition, the processing circuit 44 displays the "Scan" portion, which indicates the scan execution phase of the flow during inspection, in a way that highlights it compared to other parts, for example, on the scan execution screen 130. On the scan execution screen 130, the edited protocol is displayed, along with the detailed conditions of the specified scan within the protocol, and the image obtained by the scan can also be confirmed.

[0127] On the scan execution screen 130, as shown in Figure 8, the scan range and reconstruction range can also be set in the same way as when setting the scan range and reconstruction range on the protocol creation screen 170.

[0128] Furthermore, on the scan execution screen 130, the processing circuit 44 controls the execution of multiple scans indicated by the multiple scan icons 513 displayed in the protocol display area 500 within the scan range set as described above. In other words, in the CT scan control method according to this embodiment, the processing circuit 44 controls the execution of multiple scans included in the imaging protocol within the scan range set as described above.

[0129] Furthermore, in the tab displaying reconstruction condition information 777, when the reconstruction execution icon 779 labeled "Reconstruction" is operated, the processing circuit 44 performs image reconstruction based on the scan data obtained from the selected scan. In other words, in the CT scan control method according to the embodiment, the processing circuit 44 performs control to reconstruct an image based on each of the scan data (subject data) obtained from multiple scans included in the imaging protocol for the subject P within the reconstruction range set as described above.

[0130] In this way, the operator can independently set the scan range and reconstruction range of the scan conditions for the selected protocol in the protocol display area 500, and link them together. In other words, the number of steps involved in protocol creation by the operator can be reduced, improving the overall workflow and throughput.

[0131] In the X-ray CT scan control method according to this embodiment, while the scan range is linked (first linkage setting) in response to the operator's input, the reconstruction range may not be linked (second linkage setting).

[0132] In the above embodiment, the linked scan conditions were exemplified by the range (start position, end position) and size (FOV) in the Z direction related to the scan range and reconstruction range, but are not limited to these. The reconstruction function and post-processing for radiation dose reduction can also be set in the same manner as linked scan conditions.

[0133] In the above embodiment, even after performing some or all of multiple scans with the scan range and reconstruction range linked settings configured, the scan range and reconstruction range can still be linked for the scans that have not yet been performed. Furthermore, the reconstruction range can still be linked for the scans that have already been performed. For example, if the reconstruction range of the raw data obtained from one of the linked scans is changed, the processing circuit 44 changes the reconstruction range of the other raw data according to the changed reconstruction range.

[0134] In the above embodiment, an example was given of linking settings for both the scan range and the reconstruction range, but the invention is not limited to this. For example, the processing circuit 44 can also perform a linking setting (second linking setting) for the reconstruction range in response to a linking setting (first linking setting) for the scan range. In other words, the processing circuit 44 may be configured to perform a linking setting that links the reconstruction range when the scan range is linked, and does not link the reconstruction range when the scan range is not linked, in response to an operation input by the operator regarding the linking setting of the scan range. With this configuration, the linking settings for the scan range and the reconstruction range can be performed more easily, and thus the throughput of image diagnosis using a medical image diagnostic device can be further improved.

[0135] In a configuration where the reconstruction range is linked according to the scan range linkage setting, that is, when the reconstruction range linkage setting is linked to the scan range linkage setting, the processing circuit 44 can also release the linkage setting for only the reconstruction range, for example, in response to the operator's input. In this case, it is also possible to release the linkage of the reconstruction range for only some scans, such as keeping the reconstruction range linked between at least two scans that are set to link the scan range, while not linking the reconstruction range for at least one other scan that is set to link the scan range. In other words, in the X-ray CT scan control method according to the embodiment, it is possible to set the scan range to be linked while not linking the reconstruction range independently. Such independent settings are useful when multiple types of reconstruction are performed. For example, it is possible to set the scan range to be linked for subtraction, while setting a wider range to be reconstructed when only contrast-enhanced images are to be reconstructed, thus setting the reconstruction range to not be linked between simple CT scans and contrast-enhanced CT scans.

[0136] Furthermore, even in a configuration where the reconstruction range is linked according to the scan range linkage settings, it is possible to link the scan range and reconstruction range for unperformed scans after some or all of the multiple scans have been performed. In addition, the reconstruction range linkage settings can be applied to scans that have already been performed.

[0137] For example, in a case where the scan range and reconstruction range are linked, after performing at least one of the at least two scans configured to be linked, the scan range for the subsequent scan can be changed before performing the subsequent scan.

[0138] For example, if an operation input is made to widen the scan range, the processing circuit 44 widens the reconstruction range within a range that does not exceed the imaging range of the completed scan. Even if an operation input is made to widen the scan range of a subsequent scan further than the imaging range of the completed scan, the processing circuit 44 sets the reconstruction range so as not to exceed the imaging range of the completed scan. In other words, the X-ray CT scan control method according to this embodiment links the reconstruction ranges with each other, while linking the scan range and reconstruction range of an uncompleted scan to the imaging range of the completed scan, with the imaging range of the completed scan as the upper limit.

[0139] Furthermore, for example, if an operation input is made to narrow the scan range, the processing circuit 44 changes the reconstruction range of the completed scan to the scan range of the uncompleted scan. The processing circuit 44 also releases the linkage of the scan ranges. The user can arbitrarily narrow the scan range of subsequent scans. Similarly, the processing circuit 44 also narrows the reconstruction range of the completed scan and the reconstruction range of the subsequent scan in a linked manner.

[0140] Furthermore, if an operation input is made to change the scan range for a subsequent scan, the processing circuit 44 may display a warning message to the operator indicating that the reconstruction range cannot be linked. This allows the user to understand that changing the scan range prevents the linked reconstruction range setting from being configured.

[0141] Furthermore, if an operation input is made to change the scan range for a subsequent scan, the processing circuit 44 may release the linkage setting in response to that operation input. In this case, the processing circuit 44 may, for example, present a warning message to the operator that the linkage setting will be released before the scan range is changed in response to the operation input, and display a button to accept input from the user acknowledging that the linkage setting will be released, so that the linkage setting is released and the scan range is changed upon such input. Through this process, the processing circuit 44 can confirm whether the processing is being done as intended by the user, and if it is, the processing circuit 44 can release the linkage setting.

[0142] Furthermore, if an operation input is made to change the scan range for a subsequent scan, the processing circuit 44 may add a scan icon to the imaging protocol (protocol display area 500) for rescanning the completed scan. At this time, the processing circuit 44 may present the operator with a warning message indicating that the reconstruction range cannot be linked, a warning message prompting a rescan, or a warning message indicating that the imaging protocol will be changed.

[0143] These warning messages are presented to the operator, for example, by display on the scan execution screen 130, but they may also be presented by audio output through a speaker.

[0144] Furthermore, information on the reconstruction range for subject data may be obtained based on each of the multiple scan data (subject data), such as raw data, projection datasets, and sinograms, obtained from each of the multiple scans included in the imaging protocol for subject P. For example, one or more sets of reconstruction conditions may be associated with the subject data obtained from each of the multiple scans, and each of these one or more reconstruction conditions may contain information on the reconstruction range.

[0145] Furthermore, the reconstruction range may be set as a subregion of the scan(gram) image obtained by scangram imaging. Here, it is assumed that the scan image is associated with the subject data. For example, the reconstruction range specified on the scan image in the protocol creation screen 170 or scan execution screen 130 described above is associated with the position information of the tabletop 33 of the patient bed 30. In addition, the acquisition location of the subject data is also associated with the position information of the tabletop 33 of the patient bed 30. Therefore, a positional correspondence can be obtained between the reconstruction range specified on the scan image and the subject data. As a result, the reconstruction range set on the scan image in the protocol creation screen 170 or scan execution screen 130 described above can be reconstructed using the subject data.

[0146] In the above description, the term "processor" refers to circuits such as CPUs, GPUs, ASICs, and Programmable Logic Devices (PLDs). PLDs include Simple Programmable Logic Devices (SPLDs), Complex Programmable Logic Devices (CPLDs), and Field Programmable Gate Arrays (FPGAs). A processor functions by reading and executing programs stored in memory circuits. The memory circuit storing the program is a computer-readable, non-temporary recording medium. Alternatively, instead of storing the program in a memory circuit, the processor may be configured to directly incorporate the program into its circuitry. In this case, the processor functions by reading and executing the program incorporated into the circuitry. Furthermore, instead of executing the program, the processor may implement the function corresponding to the program through a combination of logic circuits. In this embodiment, each processor is not limited to being configured as a single circuit; multiple independent circuits may be combined to form a single processor, and its functions may be implemented from there. Additionally, multiple components shown in Figure 1 may be integrated into a single processor to implement its functions.

[0147] According to at least one embodiment described above, the throughput of image diagnosis using a medical image diagnostic device can be improved.

[0148] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These embodiments can be carried out in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. [Explanation of symbols]

[0149] 1. X-ray CT scanner (medical imaging diagnostic equipment) 10 mounting bases 11 X-ray tube 12 X-ray detectors 13 rotation frames 14 X-ray high-voltage equipment 15 Control device 16 Wedge 17 Collimator 18 Data Collection Circuit 19 Opening 30 berths 31 base 32 Bed drive mechanism 33 Top plate 34 Support Frame 40 Console 41 memory 42 displays 43 Input Interfaces 44 Processing Circuits 45 System control functions 46 Image generation function 47 Image Processing Functions 48 Display control function 130 Scan execution screen 170 Protocol creation screen 300 Protocol Selection Area 500 protocol display area 700 Scan information display area

Claims

1. First subject data obtained from a first CT scan of the subject and second subject data obtained from a second CT scan of the subject are acquired. A setting indicating whether or not to link the first reconstruction range, which is the range of image reconstruction for the first subject data, and the second reconstruction range, which is the range of image reconstruction for the second subject data, wherein the linkage setting for the reconstruction ranges set after the first CT scan and before the second CT scan is read, When an instruction to change the first reconstruction range is given, control is performed to determine whether or not to change the second reconstruction range along with the first reconstruction range, depending on whether or not the reconstruction range is set to be linked in the reconstruction range linkage setting. Within the range of image reconstruction according to the control, a first image is reconstructed from the first subject data and a second image is reconstructed from the second subject data. Medical image processing methods.

2. The synchronization setting for the reconstruction range and the synchronization setting for the scan range, which indicates whether or not to synchronize the scan range between the first CT scan and the second CT scan for the subject, are each set individually. The medical image processing method according to claim 1.

3. The aforementioned reconstruction range linkage setting applies the state of the linkage setting set for the scan range linkage setting, which indicates whether or not to link the scan range between the first CT scan and the second CT scan of the subject. The medical image processing method according to claim 1.

4. Multiple subject data obtained from a series of multiple CT scans of the subject, including the first CT scan and the second CT scan, The system reads the reconstruction range linkage setting, which indicates whether or not to link each of the multiple reconstruction ranges, which are the image reconstruction ranges for each of the multiple subject data, with other reconstruction ranges among the multiple reconstruction ranges. When a change instruction is given for any of the aforementioned multiple reconstruction ranges, control is performed to determine whether to change each of the other reconstruction ranges among the aforementioned multiple reconstruction ranges, depending on whether the linkage setting is configured to link the reconstruction ranges with the reconstruction range to which the change instruction was given. Within the range of image reconstruction according to the control, multiple images are reconstructed from each of the multiple subject data. A medical image processing method according to any one of claims 1 to 3.

5. The system is configured to perform multiple CT scans on the subject, including a first CT scan and a second CT scan. A first linkage setting is set to indicate whether or not to link the scan range between the first CT scan and the second CT scan, and a second linkage setting is set to indicate whether or not to link the reconstruction range between the image reconstruction based on the data obtained from the first CT scan and the image reconstruction based on the data obtained from the second CT scan. If the first linkage setting is configured to link the scan ranges, the scan range of the second CT scan is set according to the scan range set for the first CT scan; if the first linkage setting is not configured to link the scan ranges, the scan range of the first CT scan and the scan range of the second CT scan are set independently. If the second linkage setting is configured to link the reconstruction ranges, the reconstruction range for the second CT scan is set according to the reconstruction range set for the first CT scan. If the second linkage setting is not configured to link the reconstruction ranges, the reconstruction range for the first CT scan and the reconstruction range for the second CT scan are set independently. The system is controlled to perform the first CT scan and the second CT scan within the set scan range, and to reconstruct images based on the first subject data and the second subject data obtained by the first CT scan and the second CT scan, respectively, within the set reconstruction range. The linked settings for the reconstruction range are performed after the first CT scan and before the second CT scan. A method for controlling X-ray CT scans.

6. A first linkage setting is set to indicate whether or not to link the scan range between each of the series of multiple CT scans and other CT scans among the multiple CT scans, and a second linkage setting is set to indicate whether or not to link each of the multiple reconstruction ranges, which are the image reconstruction ranges for each of the multiple subject data obtained by the multiple CT scans, and other reconstruction ranges among the multiple reconstruction ranges, If the scan ranges are linked in the first linkage setting described above, the scan range of the other CT scan among the at least two CT scans whose scan ranges are linked is set according to the scan range set for one of the at least two CT scans whose scan ranges are linked. If the scan ranges are not linked in the first linkage setting described above, the scan range of each of the multiple CT scans is set independently. If the second linkage setting is configured to link the reconstruction ranges, the reconstruction range for the other CT scan among the at least two CT scans whose reconstruction ranges are linked is set according to the reconstruction range set for one of those two CT scans. If the second linkage setting is not configured to link the reconstruction ranges, the reconstruction range for each of the multiple CT scans is set independently. The system is controlled to perform the multiple CT scans within the set scan range and to reconstruct images based on each of the multiple subject data obtained from the multiple CT scans within the set reconstruction range. The method for controlling an X-ray CT scan according to claim 5.

7. A scan range linkage setting is set to indicate whether or not to link the scan range between the first CT scan on the subject and the second CT scan on the subject. The state of the linked scan range setting is applied to the linked reconstruction range setting, which indicates whether or not to link the reconstruction range, which is the range of image reconstruction for the subject data, between the subject data obtained by the first CT scan and the subject data obtained by the second CT scan. If the scan ranges are linked in the aforementioned scan range linkage setting, the scan range of the second CT scan is set according to the scan range set for the first CT scan, and the reconstruction range for the second CT scan is set according to the reconstruction range set for the first CT scan. The system is controlled to perform the first CT scan and the second CT scan within the set scan range, and to reconstruct images based on the first subject data and the second subject data obtained by the first CT scan and the second CT scan, respectively, within the set reconstruction range. The linked settings for the reconstruction range are performed after the first CT scan and before the second CT scan. A method for controlling X-ray CT scans.

8. A scan range linkage setting is set to indicate whether or not to link the scan range between each of the series of CT scans of the subject, including the first CT scan and the second CT scan, and other CT scans among the series of CT scans. If the scan range linkage setting is configured to link the scan ranges, the scan range of the other CT scan among the at least two CT scans whose scan ranges are linked will be set according to the scan range set for one of the at least two CT scans whose scan ranges are linked, and the reconstruction range of the other CT scan among the at least two CT scans will be set according to the reconstruction range set for one of the at least two CT scans whose scan ranges are linked. The system is controlled to perform the multiple CT scans within the set scan range and to reconstruct images based on each of the multiple subject data obtained from the multiple CT scans within the set reconstruction range. The method for controlling an X-ray CT scan according to claim 7.

9. The X-ray CT scan control method according to claim 7 or claim 8, wherein, in the aforementioned scan range linkage setting, the scan range is set to be linked between the first CT scan and the second CT scan, and when a release instruction is given to release the linkage of the reconstruction range, the state of the scan range linkage setting is applied to set the reconstruction range linkage setting, which was set to link the reconstruction range, to a setting where the reconstruction range is not linked between the first CT scan and the second CT scan.

10. A method for controlling an X-ray CT scan according to any one of claims 7 to 9, wherein when a change is made to widen the scan range of the unperformed second CT scan, the reconstruction range is linked between the performed first CT scan and the unperformed second CT scan, with the scan range of the performed first CT scan as the upper limit.

11. A method for controlling an X-ray CT scan according to any one of claims 7 to 10, wherein when a change is made to narrow the scan range of the unperformed second CT scan, the reconstruction range of the completed first CT scan is changed in conjunction with the reconstruction range set for the unperformed second CT scan, and the linkage of the scan ranges between the first CT scan and the second CT scan is released.

12. The X-ray CT scan control method according to any one of claims 5 to 11, wherein the first CT scan and the second CT scan are a plain CT scan and a contrast-enhanced CT scan.

Images