WO2012073962A1 - Ｘ線ｃｔ装置及び画像生成方法 - Google Patents

Ｘ線ｃｔ装置及び画像生成方法 Download PDF

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Publication number
WO2012073962A1
WO2012073962A1 PCT/JP2011/077548 JP2011077548W WO2012073962A1 WO 2012073962 A1 WO2012073962 A1 WO 2012073962A1 JP 2011077548 W JP2011077548 W JP 2011077548W WO 2012073962 A1 WO2012073962 A1 WO 2012073962A1
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WIPO (PCT)
Prior art keywords
region
image data
ray
interest
pixel value
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PCT/JP2011/077548
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English (en)
French (fr)
Japanese (ja)
Inventor
博基 田口
昌快 津雪
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Toshiba Corp
Canon Medical Systems Corp
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Toshiba Corp
Toshiba Medical Systems Corp
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Priority to CN201180004169.9A priority Critical patent/CN102695454B/zh
Publication of WO2012073962A1 publication Critical patent/WO2012073962A1/ja
Priority to US13/614,341 priority patent/US9629596B2/en
Anticipated expiration legal-status Critical
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/48—Diagnostic techniques
    • A61B6/488—Diagnostic techniques involving pre-scan acquisition
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • A61B6/032—Transmission computed tomography [CT]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/48—Diagnostic techniques
    • A61B6/481—Diagnostic techniques involving the use of contrast agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/54—Control of apparatus or devices for radiation diagnosis

Definitions

  • the present embodiment as one aspect of the present invention relates to an X-ray CT (computed tomography) apparatus and an image generation method for injecting a contrast medium into a subject and scanning.
  • X-ray CT computed tomography
  • the dynamic scan is a technique in which after a contrast agent is administered, the scan is continuously performed for a predetermined time according to the speed of the contrast agent flowing in the subject.
  • a conventional X-ray CT apparatus generates a non-contrast image of a subject in a non-contrast state, sets an ROI (region of interest) and a threshold based on the non-contrast image, and starts injection of a contrast agent. Then, after the start of the injection of the contrast agent, Real Prep is started (see, for example, Patent Document 1).
  • the real prep detects the start timing (trigger) of the main scan before the main scan such as a dynamic scan, and starts the main scan when the CT value in the ROI exceeds a threshold value.
  • the operator only has a function of placing the ROI at an arbitrary position using a non-contrast image.
  • Real prep is currently used in a variety of situations, such as when the patient is breathing, and when the contrast medium arrives, the main scan is performed as soon as possible, and the start timing of the main scan needs to be detected with high accuracy. ing.
  • a high CT value region such as bone and calcification existing outside the ROI and around the ROI is detected after the start of the real prep, There is a possibility of entering into the ROI due to breathing, body movement, etc., and there is a possibility that the start timing of the main scan is wrong.
  • the body movement of the subject often moves up and down as well as back and forth and left and right. Further, when real prep is performed in the vicinity of the aorta under breathing, there is a high possibility that a high CT value region such as calcification will enter the ROI due to vertical movement of the subject.
  • FIG. 1 is a configuration diagram showing an X-ray CT apparatus of the present embodiment.
  • the block diagram which shows the function of the X-ray CT apparatus of this embodiment.
  • the flowchart which shows operation
  • FIGS. 7A to 7C are diagrams for explaining a change in ROI.
  • the X-ray CT apparatus includes an X-ray source and an X-ray detector, and a pre-scan that performs scanning by controlling the operation of the scanning unit that collects data of a subject and the scanning unit.
  • a control unit ; an image generation unit configured to generate image data of the subject based on the pre-scan; a region of interest for measuring a change in contrast agent based on the image data; the region of interest and a peripheral region thereof
  • an area setting means for setting an enlarged area for determining whether or not a high pixel value area exists, and when there is no pixel value exceeding the first threshold in the enlarged area, Timing detection means for detecting a start timing of a main scan in which a pixel value in the region of interest exceeds a second threshold after the injection of the contrast agent is started.
  • the computer-generated image generation method includes an X-ray source and an X-ray detector, and controls the operation of a scanning unit that collects data of an object to execute pre-scan. Whether or not there is a high pixel value region including a region of interest for generating image data of the subject and measuring a change in contrast agent based on the image data, the region of interest and its surrounding region And when there is no pixel value exceeding the first threshold in the enlarged region, after the injection of the contrast agent is started, the pixels in the region of interest The start timing of the main scan whose value exceeds the second threshold is detected.
  • an X-ray source and an X-ray detector are integrated with a rotation / rotation (rotate / rotate) type in which the periphery of the subject rotates, and a large number of detection elements are arrayed in a ring shape.
  • rotation / rotation rotate / rotate
  • STATIONION / ROTATE fixed / rotation
  • the present invention can be applied to any type.
  • the rotation / rotation type that currently occupies the mainstream will be described.
  • the mechanism for converting incident X-rays into electric charges is based on an indirect conversion type in which X-rays are converted into light by a phosphor such as a scintillator and the light is further converted into electric charges by a photoelectric conversion element such as a photodiode.
  • a photoelectric conversion element such as a photodiode.
  • a so-called multi-tube type X-ray CT apparatus in which a plurality of pairs of an X-ray source and an X-ray detector are mounted on a rotating ring has been commercialized, and the development of peripheral technologies has progressed.
  • the X-ray CT apparatus of the present embodiment can be applied to both a conventional single-tube type X-ray CT apparatus and a multi-tube type X-ray CT apparatus.
  • a single tube X-ray CT apparatus will be described.
  • FIG. 1 is a configuration diagram showing the X-ray CT apparatus of the present embodiment.
  • FIG. 1 shows an X-ray CT apparatus 1 of the present embodiment that scans by injecting a contrast medium into a subject.
  • the X-ray CT apparatus 1 is mainly composed of a scanner device 11 and an image processing device 12.
  • the scanner device 11 of the X-ray CT apparatus 1 is usually installed in an examination room and configured to generate X-ray transmission data regarding a patient (subject) O.
  • the image processing apparatus 12 is usually installed in a control room adjacent to the examination room, and is configured to generate projection data based on transmission data and generate / display a reconstructed image.
  • the scanner device 11 of the X-ray CT apparatus 1 includes an X-ray tube (X-ray source) 21, an aperture 22, an X-ray detector 23, a DAS (data acquisition system) 24, a rotating unit 25, a high voltage power supply 26, and an aperture drive device. 27, a rotation drive device 28, a top plate 30, a top plate drive device 31, and a controller 32 are provided.
  • the X-ray tube 21 generates an X-ray by causing an electron beam to collide with a metal target according to the tube voltage supplied from the high-voltage power supply 26 and irradiates the X-ray detector 23 toward the X-ray detector 23. Fan beam X-rays and cone beam X-rays are formed by X-rays emitted from the X-ray tube 21.
  • the X-ray tube 21 is supplied with electric power necessary for X-ray irradiation under the control of the controller 32 via the high voltage power supply 26.
  • the diaphragm 22 adjusts the irradiation range in the slice direction of the X-rays irradiated from the X-ray tube 21 by the diaphragm driving device 27. That is, by adjusting the aperture of the diaphragm 22 by the diaphragm driving device 27, the X-ray irradiation range in the slice direction can be changed.
  • the X-ray detector 23 is a one-dimensional array type detector (also referred to as a single slice type detector) having a plurality of detection elements in the channel direction and a single detection element in the column (slice) direction.
  • the X-ray detector 23 is a two-dimensional array detector (also referred to as a multi-slice detector) having a matrix, that is, a plurality of channels in the channel direction and a plurality of rows of X-ray detection elements in the slice direction. is there.
  • the X-ray detection element of the X-ray detector 23 detects X-rays emitted from the X-ray tube 21.
  • the DAS 24 amplifies the transmission data signal detected by each X-ray detection element of the X-ray detector 23 and converts it into a digital signal. Output data from the DAS 24 is supplied to the image processing apparatus 12 via the controller 32 of the scanner apparatus 11.
  • Rotating unit 25 holds X-ray tube 21, diaphragm 22, X-ray detector 23, and DAS 24 as a unit.
  • the rotating unit 25 can rotate around the subject O together with the X-ray tube 21, the diaphragm 22, the X-ray detector 23, and the DAS 24 with the X-ray tube 21 and the X-ray detector 23 facing each other. It is configured as follows.
  • a direction parallel to the rotation center axis of the rotating unit 25 is defined as a z-axis direction, and a plane orthogonal to the z-axis direction is defined as an x-axis direction and a y-axis direction.
  • the high voltage power supply 26 supplies power necessary for X-ray irradiation to the X-ray tube 21 under the control of the controller 32.
  • the diaphragm driving device 27 has a mechanism for adjusting the irradiation range of the diaphragm 22 in the X-ray slice direction under the control of the controller 32.
  • the rotation drive device 28 has a mechanism for rotating the rotating unit 25 so that the rotating unit 25 rotates around the hollow portion while maintaining the positional relationship under the control of the controller 32.
  • the top board 30 can place the patient O.
  • the top plate driving device 31 has a mechanism for moving the top plate 30 up and down along the y-axis direction and moving in / out along the z-axis direction under the control of the controller 32.
  • the central portion of the rotating unit 25 has an opening, and the subject O placed on the top 30 of the opening is inserted.
  • the controller 32 includes a CPU (central processing unit) and a memory.
  • the controller 32 controls the X-ray detector 23, the DAS 24, the high voltage power supply 26, the aperture driving device 27, the rotation driving device 28, the top plate driving device 31, and the like to execute scanning.
  • the image processing apparatus 12 of the X-ray CT apparatus 1 is configured based on a computer, and can communicate with a network N such as a hospital basic LAN (local area network).
  • the image processing device 12 is mainly composed of basic hardware such as a CPU 41, a memory 42, an HDD (hard disc drive) 43, an input device 44, and a display device 45.
  • the CPU 41 is interconnected to each hardware component constituting the image processing device 12 via a bus as a common signal transmission path.
  • the image processing apparatus 12 may include a storage medium drive 46.
  • the CPU 41 is a control device having an integrated circuit (LSI) configuration in which an electronic circuit made of a semiconductor is enclosed in a package having a plurality of terminals.
  • LSI integrated circuit
  • the CPU 41 executes a program stored in the memory 42.
  • the CPU 41 reads a program stored in the HDD 43, a program transferred from the network N and installed in the HDD 43, or a program read from the storage medium installed in the storage medium drive 46 and installed in the HDD 43. It is loaded into the memory 42 and executed.
  • the memory 42 is a storage device including a ROM (read only memory) and a RAM (random access memory).
  • the memory 42 stores IPL (initial program loading), BIOS (basic input / output system), and data, and is used for temporary storage of the work memory of the CPU 41 and data.
  • the HDD 43 is a storage device having a configuration in which a metal disk coated or vapor-deposited with a magnetic material is not removable and is built in.
  • the HDD 43 is a storage device that stores programs installed in the image processing apparatus 12 (including application programs, OS (operating system), etc.), and data such as projection data and image data.
  • the OS can be provided with a graphical user interface (GUI) that can perform basic operations with the input device 44 by using a lot of graphics for displaying information to the operator.
  • GUI graphical user interface
  • a storage device such as an SSD or MRAM may be used.
  • the input device 44 is a pointing device that can be operated by an operator, and an input signal according to the operation is sent to the CPU 41.
  • the display device 45 includes an image composition circuit (not shown), a VRAM (video random access memory), a display, and the like.
  • the image synthesizing circuit generates synthesized data obtained by synthesizing character data of various parameters with image data.
  • the VRAM expands the composite data as data to be displayed on the display.
  • the display is configured by a liquid crystal display, a CRT (cathode ray tube), or the like, and sequentially displays the developed data.
  • the storage medium drive 46 can be attached to and detached from the storage medium, reads out data (including programs) stored in the storage medium, outputs the data on the bus, and outputs data supplied via the bus. Write to storage media.
  • a storage medium can be provided in a state where so-called package software is stored.
  • the image processing device 12 performs projection processing on the raw data input from the DAS 24 of the scanner device 11 and correction processing such as sensitivity correction (preprocessing) to generate projection data. Further, the image processing device 12 performs scattered radiation removal processing on the preprocessed projection data. The image processing device 12 removes scattered radiation based on the value of the projection data within the X-ray exposure range, and based on the projection data to be subjected to scattered radiation correction or the value of the adjacent projection data. The estimated scattered radiation is subtracted from the target projection data to perform scattered radiation correction. The image processing device 12 generates and stores image data by reconstructing the corrected projection data.
  • FIG. 2 is a block diagram showing functions of the X-ray CT apparatus 1 of the present embodiment.
  • the X-ray CT apparatus 1 When the CPU 41 of the image processing apparatus 12 executes the program, the X-ray CT apparatus 1 has a prescan control unit 51, an image generation unit 52, an area setting unit 53, a comparison unit 54, an abnormality notification, as shown in FIG. Functions as a unit 55, a normal notification unit 56, a contrast medium injection start reception unit 57, a timing detection unit 58, and a main scan control unit 59. Note that all or part of the components 51 to 59 of the X-ray CT apparatus 1 may be provided as hardware in the X-ray CT apparatus 1.
  • the pre-scan control unit 51 controls the operation of the scanner device 11 via the controller 32 to execute the pre-scan of the patient O before the main scan performed by injecting the contrast medium into the subject, for example, the dynamic scan. It has a function.
  • the pre-scan executed by the pre-scan control unit 51 may be a non-contrast scan, or a scan after injection of the contrast agent and before the arrival of the contrast agent at the ROI (region of interest). May be.
  • the pre-scan executed by the pre-scan control unit 51 will be described as a non-contrast scan.
  • the pre-scan control unit 51 executes conventional scan, helical scan, volume scan, and the like.
  • the non-contrast image data generated by the image generation unit 52 is stored in a storage device such as the HDD 43.
  • the region setting unit 53 has a function of setting an ROI for measuring a change in contrast agent by real prep based on the non-contrast image data generated by the image generation unit 52. For example, the region setting unit 53 sets the ROI based on the input signal input by the operator via the input device 44 while viewing the non-contrast image data displayed on the display device 45.
  • the region setting unit 53 includes a set ROI and its surrounding region (which may include a slice direction), and has a function of setting an enlarged region for determining whether a high CT value region exists.
  • the area setting unit 53 may automatically set an enlarged area based on the set ROI, or may set an enlarged area based on an input signal input by an operator via the input device 44.
  • FIG. 3 is a diagram for explaining a method for setting an enlarged region using single slice non-contrast image data.
  • the operator designates the ROI based on the non-contrast image data shown in FIG.
  • the area setting unit 53 sets an enlarged area so as to include the entire set ROI. It is assumed that high CT value areas A1 and A2 exist in the enlarged area.
  • FIG. 4 is a diagram for explaining a method for setting an enlarged region using multi-slice non-contrast image data.
  • FIG. 4 shows multi-slice non-contrast image data 401 and 403 and non-contrast image data 402 displayed in a stack based on multi-slice non-contrast image data.
  • the non-contrast image data 402 displayed as a stack is generated by averaging the at least some slices of the non-contrast image data 401 of N slices.
  • FIG. 4 shows an example in which the non-contrast image data 402 displayed as a stack is generated by averaging all slices of the non-contrast image data 401 of N slices.
  • the region setting unit 53 performs non-contrast of the N slices ROIs are set for the non-contrast image data from the (n ⁇ i) th to the (n + i) th image in the image data. Then, the region setting unit 53 sets each enlarged region in the non-contrast image data in which the ROI is set so as to include the entire ROI.
  • the comparison unit 54 illustrated in FIG. 2 compares the CT value (pixel value) in the enlarged region set by the region setting unit 53 with the first threshold value set to exclude the high CT value regions A1 and A2. By doing so, it has a function of determining whether or not a high CT value region exists in the enlarged region. That is, the comparison unit 54 compares the CT value in the enlarged region including the ROI with the first threshold value.
  • the reason for determining whether or not the high CT value region exists in the enlarged region is that even if the high CT value region exists outside the ROI at the time of setting the ROI, for example, after the start of contrast agent injection This is because there is a possibility that the subject's heartbeat, respiration, body movement, etc. may enter the ROI, and the start timing of the main scan may be erroneous.
  • the abnormality notification unit 55 determines that there is a CT value exceeding the first threshold in the enlarged region set by the region setting unit 53 based on the comparison result by the comparison unit 54, the abnormality notification unit 55 has a high CT value in the ROI. If there is a region, or there is a possibility that a high CT value region may enter the ROI after the start of the injection of the contrast agent, it may have a function of notifying that effect (ROI abnormality). Similarly, when the multi-slice non-contrast image data is generated by the image generation unit 52, the abnormality notification unit 55 is within the enlarged region set by the region setting unit 53 based on the comparison result by the comparison unit 54. When it is determined that there is a CT value that exceeds the first threshold, that fact may be notified.
  • the ROI abnormality notification may be output from a speaker (not shown) or may be output from the display device 45.
  • the CT value of the non-contrast image data having a CT value exceeding the first threshold may be displayed in color according to the size thereof. it can.
  • the region setting unit 53 can reset the ROI based on the non-contrast image data generated by the image generation unit 52.
  • the normal notification unit 56 determines that there is no CT value exceeding the first threshold in the enlarged region set by the region setting unit 53 based on the comparison result by the comparison unit 54, the normal notification unit 56 has a high CT in the ROI. There is no value area, and there is a possibility that a high CT value area will not enter (be low) in the ROI after the start of contrast agent injection. May be.
  • the normal notification unit 56 is within the enlarged region set by the region setting unit 53 based on the comparison result by the comparison unit 54. When it is determined that there is no CT value exceeding the first threshold value, this fact may be notified.
  • the contrast medium injection start accepting unit 57 is contrast-enhanced based on an input signal input by the operator via the input device 44 when the abnormality notifying unit 55 or the normal notifying unit 56 notifies the operator of the abnormality / normality of the ROI.
  • You may have a function which receives the start instruction
  • the operator may be allowed to execute the main scan. For example, when the abnormality notifying unit 55 displays the CT value of the image data having a CT value exceeding the first threshold in color according to the size, the operator uses the input device 44 while watching the color display. Therefore, the start of contrast medium injection may be performed in preference to the ROI resetting.
  • the timing detection unit 58 starts the real prep after the injection of the contrast medium into the patient O is started, and the CT value in the ROI set by the region setting unit 53 exceeds the preset second threshold value. It has a function of detecting the start timing (trigger) of the main scan.
  • the main scan control unit 59 has a function of executing the main scan of the patient O by controlling the operation of the scanner device 11 via the controller 32 when the timing detection unit 58 detects the start timing of the main scan.
  • the image generation unit 52 has a function of generating contrast image data of a plurality of slices based on data collected by the scanner device 11 by the main scan under the control of the main scan control unit 59.
  • the contrast image data generated by the image generation unit 52 is stored in a storage device such as the HDD 43.
  • the X-ray CT apparatus 1 controls the operation of the scanner apparatus 11 via the controller 32, and executes a pre-scan of the patient O without contrast before the main scan (step ST1).
  • the X-ray CT apparatus 1 generates non-contrast image data of N slices based on data collected by the scanner apparatus 11 by pre-scanning under the control of the pre-scan control unit 51 (step ST2).
  • the non-contrast image data generated in step ST2 is stored in a storage device such as the HDD 43.
  • the X-ray CT apparatus 1 sets an ROI for measuring a change in contrast agent based on the non-contrast image data generated in step ST2 (step ST3). For example, in step ST3, the X-ray CT apparatus 1 sets the ROI based on the input signal input by the operator via the input device 44 while viewing the non-contrast image data displayed on the display device 45. Further, the X-ray CT apparatus 1 sets an enlarged region for determining whether or not a high CT value region exists, including the ROI set in step ST3 and its peripheral region (step ST4).
  • the X-ray CT apparatus 1 compares the CT value in the enlarged region set in step ST4 with the first threshold value set to exclude the high CT value regions A1 and A2 (step ST5). As a result of the comparison in step ST5, the X-ray CT apparatus 1 determines whether or not there is a CT value exceeding the first threshold in the enlarged region (step ST6). If YES in step ST6, that is, if the X-ray CT apparatus 1 determines that there is a CT value exceeding the first threshold in the enlarged region, the operator is informed of the ROI abnormality (step ST7).
  • the X-ray CT apparatus 1 determines whether or not to reset the ROI based on an input signal input by the operator via the input device 44 (step ST8). . If YES in step ST8, that is, if it is determined that the ROI is to be reset, the X-ray CT apparatus 1 sets the ROI again based on the non-contrast image data generated in step ST2 (step ST3).
  • step ST6 determines whether the X-ray CT apparatus 1 determines that there is no CT value exceeding the first threshold in the enlarged region. If the determination in step ST6 is NO, that is, if the X-ray CT apparatus 1 determines that there is no CT value exceeding the first threshold in the enlarged region, the operator is notified of the normality of the ROI (step ST9).
  • step ST8 determines whether the X-ray CT apparatus 1 is based on an input signal input by the operator via the input device 44.
  • An instruction to start contrast medium injection is accepted (step ST10).
  • step ST10 injection of the contrast agent into the patient O is started.
  • the X-ray CT apparatus 1 starts real prep after the contrast medium is injected into the patient O (step ST11).
  • the X-ray CT apparatus 1 detects the start timing of the main scan in which the CT value in the ROI set in step ST3 exceeds the preset second threshold value (step ST12).
  • the X-ray CT apparatus 1 controls the operation of the scanner device 11 via the controller 32 and executes the main scan of the patient O (step ST13).
  • the X-ray CT apparatus 1 generates a plurality of slices of contrast image data based on the data collected by the scanner apparatus 11 by the main scan in step ST13 (step ST14).
  • the contrast image data generated in step ST14 is stored in a storage device such as the HDD 43.
  • FIG. 6 is a block diagram showing a modification of the function of the X-ray CT apparatus 1 of the present embodiment.
  • the X-ray CT apparatus 1 When the CPU 41 of the image processing apparatus 12 executes the program, the X-ray CT apparatus 1 has a pre-scan control unit 51, an image generation unit 52, an area setting unit 53, a main scan control unit 59, as shown in FIG. It functions as a high CT value region extraction unit 60, an ROI change unit 61, a contrast medium injection start reception unit 62, and a timing detection unit 63. Note that all or part of the components 51 to 53 and 59 to 63 of the X-ray CT apparatus 1 may be provided as hardware in the X-ray CT apparatus 1.
  • the high CT value region extraction unit 60 compares the CT value in the enlarged region set by the region setting unit 53 with the first threshold value set to exclude the high CT value regions A1 and A2. And a function of extracting a high CT value region in the enlarged region. .
  • the ROI changing unit 61 has a function of changing the ROI set by the region setting unit 53 so as not to include the high CT value region when the high CT value region is extracted by the high CT value region extracting unit 60. For example, when a high CT value region is extracted, the ROI part setting unit 61 changes (deforms) the ROI so as not to include a region within a required distance from the high CT value region. For example, when a high CT value region is extracted, the ROI changing unit 61 reduces the ROI so as not to include a region within a required distance from the high CT value region. Further, for example, when the high CT value region is extracted, the ROI changing unit 61 changes (moves) the position of the ROI so as not to include the region within the required distance from the high CT value region.
  • 7A to 7C are diagrams for explaining the change of the ROI.
  • FIG. 7A shows an example in which the ROI is changed so as not to include the region within the required distance D from the high CT value region when the high CT value region is extracted. According to FIG. 7A, the shape of the ROI is deformed.
  • FIG. 7B shows an example in which the ROI is reduced so as not to include the region within the required distance D from the high CT value region when the high CT value region is extracted.
  • FIG. 7C shows an example of changing the position of the ROI so as not to include the region within the required distance D from the high CT value region when the high CT value region is extracted. According to FIG. 7C, the position of the ROI is moved.
  • the high CT value region outside the ROI and around the ROI may enter the ROI due to the heartbeat, respiration, body movement, etc. of the subject after the start of the injection of the contrast agent. Accordingly, the ROI changing unit 61 sets a region outside the ROI and within the required distance D from the high CT value region existing around the ROI as a movement estimation region of the high CT value region so as not to include the movement estimation region. Change the position of the ROI.
  • or FIG. 7 (C) may each be performed independently, and may be combined.
  • the contrast medium injection start accepting unit 62 shown in FIG. It has a function of receiving a contrast medium injection start instruction based on an input signal input by the operator.
  • the timing detection unit 63 starts real prep after the injection of the contrast medium into the patient O is started, and within the ROI changed by the ROI changing unit 61 or within the ROI set by the region setting unit 53 It has a function of detecting the start timing of the main scan in which the CT value exceeds a preset second threshold.
  • the X-ray CT apparatus 1 compares the CT value in the enlarged region set in step ST4 with the first threshold value set to exclude the high CT value regions A1 and A2 (step ST5). Then, it is determined whether or not a high CT value region exists in the enlarged region (step ST26). If YES in step ST26, that is, if the X-ray CT apparatus 1 determines that a high CT value area exists in the enlarged area, the ROI set in step ST3 is changed based on the high CT value area. (Step ST27).
  • the method for changing the ROI in step ST27 is, for example, in accordance with FIGS. 7A to 7C.
  • step ST26 determines whether there is no high CT value region in the enlarged region. If the determination in step ST26 is NO, that is, if the X-ray CT apparatus 1 determines that there is no high CT value region in the enlarged region, it is unnecessary to change the ROI set in step ST3. Judgment is made (step ST28).
  • the X-ray CT apparatus 1 When the ROI is changed in step ST27 or when it is determined that the change in ROI is unnecessary in step ST28, the X-ray CT apparatus 1 is based on the input signal input by the operator via the input device 44. An instruction to start injection of contrast medium is received (step ST29). When the X-ray CT apparatus 1 receives an instruction to start contrast agent injection in step ST10, injection of the contrast agent into the patient O is started.
  • the X-ray CT apparatus 1 starts real prep after the contrast medium is injected into the patient O (step ST11).
  • the X-ray CT apparatus 1 detects the start timing of the main scan in which the CT value in the ROI changed in step ST27 or in the ROI set in step ST3 exceeds the preset second threshold value (step ST32).
  • the X-ray CT apparatus 1 controls the operation of the scanner device 11 via the controller 32 and executes the main scan of the patient O (step ST13).
  • the presence of a high CT value region is determined not in the ROI but in an enlarged region including the ROI and its peripheral region based on the non-contrast image data. Even if the patient O has a heartbeat, respiration, and body movement after the start of this, the start timing of the main scan can be detected accurately and accurately.

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JP6521575B2 (ja) * 2013-06-11 2019-05-29 キヤノンメディカルシステムズ株式会社 Ｘ線コンピュータ断層撮影装置
KR102067277B1 (ko) * 2013-08-20 2020-01-16 삼성전자주식회사 의료 영상 디스플레이 방법 및 장치
US11857356B2 (en) 2014-02-21 2024-01-02 Siemens Healthcare Gmbh Method and device for recording medical images
DE102014203463B3 (de) 2014-02-26 2015-07-09 Siemens Aktiengesellschaft Patientenabhängige Optimierung der Kontrastmittelmenge
US10813609B2 (en) * 2015-12-18 2020-10-27 Shimadzu Corporation X-ray imaging apparatus
CN105631882A (zh) * 2015-12-30 2016-06-01 沈阳东软医疗系统有限公司 扫描参数设置方法及装置
US10824892B2 (en) * 2018-06-29 2020-11-03 General Electric Company System and method for imaging an object via pre-shot processing
JP7223517B2 (ja) * 2018-07-04 2023-02-16 キヤノンメディカルシステムズ株式会社 医用画像診断装置
JP7236239B2 (ja) * 2018-10-05 2023-03-09 キヤノンメディカルシステムズ株式会社 Ｘ線ｃｔシステム及びｃｔスキャン実行プログラム
KR102255289B1 (ko) * 2019-05-23 2021-05-21 신한대학교 산학협력단 볼러스 트랙킹 ct의 제어방법
JP7635980B2 (ja) * 2021-06-10 2025-02-26 株式会社根本杏林堂 情報処理装置、検査システム、情報処理方法、及びプログラム

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11342125A (ja) * 1998-03-30 1999-12-14 Toshiba Corp Ｘ線ｃｔ装置
JP2003245275A (ja) * 2001-12-20 2003-09-02 Toshiba Corp Ｘ線コンピュータ断層撮影装置
JP2009022455A (ja) * 2007-07-18 2009-02-05 Toshiba Corp 医用画像診断装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2624927B2 (ja) 1992-10-06 1997-06-25 株式会社東芝 Ｘ線ｃｔ装置
US6188744B1 (en) 1998-03-30 2001-02-13 Kabushiki Kaisha Toshiba X-ray CT apparatus
JP5433299B2 (ja) * 2009-05-18 2014-03-05 株式会社東芝 医用画像診断装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11342125A (ja) * 1998-03-30 1999-12-14 Toshiba Corp Ｘ線ｃｔ装置
JP2003245275A (ja) * 2001-12-20 2003-09-02 Toshiba Corp Ｘ線コンピュータ断層撮影装置
JP2009022455A (ja) * 2007-07-18 2009-02-05 Toshiba Corp 医用画像診断装置

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JP5761972B2 (ja) 2015-08-12
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