WO2010150783A1 - 医用画像撮影装置 - Google Patents
医用画像撮影装置 Download PDFInfo
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- WO2010150783A1 WO2010150783A1 PCT/JP2010/060557 JP2010060557W WO2010150783A1 WO 2010150783 A1 WO2010150783 A1 WO 2010150783A1 JP 2010060557 W JP2010060557 W JP 2010060557W WO 2010150783 A1 WO2010150783 A1 WO 2010150783A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0033—Features or image-related aspects of imaging apparatus classified in A61B5/00, e.g. for MRI, optical tomography or impedance tomography apparatus; arrangements of imaging apparatus in a room
- A61B5/0037—Performing a preliminary scan, e.g. a prescan for identifying a region of interest
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0033—Features or image-related aspects of imaging apparatus classified in A61B5/00, e.g. for MRI, optical tomography or impedance tomography apparatus; arrangements of imaging apparatus in a room
- A61B5/004—Features or image-related aspects of imaging apparatus classified in A61B5/00, e.g. for MRI, optical tomography or impedance tomography apparatus; arrangements of imaging apparatus in a room adapted for image acquisition of a particular organ or body part
- A61B5/0042—Features or image-related aspects of imaging apparatus classified in A61B5/00, e.g. for MRI, optical tomography or impedance tomography apparatus; arrangements of imaging apparatus in a room adapted for image acquisition of a particular organ or body part for the brain
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/483—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy
- G01R33/4833—NMR imaging systems with selection of signals or spectra from particular regions of the volume, e.g. in vivo spectroscopy using spatially selective excitation of the volume of interest, e.g. selecting non-orthogonal or inclined slices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
- G01R33/543—Control of the operation of the MR system, e.g. setting of acquisition parameters prior to or during MR data acquisition, dynamic shimming, use of one or more scout images for scan plane prescription
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2576/00—Medical imaging apparatus involving image processing or analysis
- A61B2576/02—Medical imaging apparatus involving image processing or analysis specially adapted for a particular organ or body part
- A61B2576/026—Medical imaging apparatus involving image processing or analysis specially adapted for a particular organ or body part for the brain
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/45—For evaluating or diagnosing the musculoskeletal system or teeth
- A61B5/4528—Joints
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/45—For evaluating or diagnosing the musculoskeletal system or teeth
- A61B5/4533—Ligaments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/54—Signal processing systems, e.g. using pulse sequences ; Generation or control of pulse sequences; Operator console
- G01R33/546—Interface between the MR system and the user, e.g. for controlling the operation of the MR system or for the design of pulse sequences
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H30/00—ICT specially adapted for the handling or processing of medical images
- G16H30/40—ICT specially adapted for the handling or processing of medical images for processing medical images, e.g. editing
Definitions
- the present invention relates to an imaging section positioning technique and a diagnostic image cutting technique in an examination using a medical imaging apparatus such as a magnetic resonance imaging apparatus.
- the magnetic resonance imaging apparatus is a medical diagnostic imaging apparatus that mainly uses proton nuclear magnetic resonance phenomenon, and excites nuclear magnetization by applying a high-frequency magnetic field to a subject placed in a static magnetic field. Then, the measured magnetic resonance signal is imaged.
- the MRI apparatus is capable of imaging any cross section non-invasively without any restriction on the imaging site.
- an MRI apparatus applies a slice gradient magnetic field that specifies a cross-section to be imaged (imaging cross-section), and at the same time, applies an excitation pulse that excites magnetization in the imaging cross-section to generate nuclear magnetic resonance (echo) in which excited magnetization is generated. Get a signal.
- a phase encoding gradient magnetic field and a readout gradient magnetic field in directions perpendicular to each other in the imaging section are applied during the period from excitation to obtaining an echo signal.
- a medical image diagnostic apparatus capable of capturing an arbitrary cross section such as an MRI apparatus
- the cross section to be captured must be set in advance. For this reason, in the inspection, scout imaging for acquiring a scout image for setting an imaging section is performed before main imaging for acquiring a diagnostic image.
- the imaging section is generally determined by the imaging site and the target disease, the operator performs manual operation on the scout image via the user interface.
- the inspection may be performed by combining imaging of different imaging sections or periodically repeating imaging on the same imaging section.
- the operator needs to set each time.
- Non-Patent Documents 1 and 2 In order to improve the operability of such an imaging section determination operation, for example, a device that facilitates visual positioning operation (for example, see Patent Document 1) or a device that performs positioning automatically by image recognition (for example, Non-Patent Documents 1 and 2) have been proposed. As an effect of automation, not only the operability is improved, but also the reproducibility of the cross section taken at the time of follow-up inspection is expected.
- Patent Document 1 still has low reproducibility and complexity because the part of the operator's manual operation still remains.
- the time taken for scout imaging becomes longer than before.
- the photographing section is calculated and determined after the scout photographing, further processing time for automation is required. For this reason, not only the inspection time as a whole is extended, but the waiting time due to the processing for automation gives stress to the operator and does not sufficiently satisfy the operator's request.
- 3D imaging for acquiring a 3D image at high speed has been performed.
- a three-dimensional space may be set as an imaging range, which is easier than in two-dimensional imaging in which a cross section is set.
- MPR Multi Planar Reconstruction
- An object of the present invention is to provide a technique capable of automatically calculating an imaging section without extending the inspection time and automatically calculating a cutting section in the MPR.
- the present invention performs the same two-dimensional scout imaging as when manually setting an imaging section, processes the obtained scout image, and calculates a recommended imaging section. Processing algorithms and various image processing methods used for the processing are stored in advance for each part to be imaged and type of examination.
- a medical image photographing apparatus capable of photographing an arbitrary surface in a three-dimensional space, and one piece parallel to a first slice surface that is one of two slice surfaces intersecting each other Image acquisition means for acquiring the first image group consisting of the above two-dimensional images and the second image group consisting of one or more two-dimensional images parallel to the second slice plane which is the other slice plane;
- Anatomical feature structure extracting means for extracting information on a predetermined anatomical feature structure from a two-dimensional image, recommended imaging section calculating means for calculating a recommended imaging section recommended as an imaging section, and a region to be imaged
- a recommended imaging section calculation information storage unit that holds recommended imaging section calculation information necessary for calculating the recommended imaging section, and the anatomical feature structure extraction unit includes the first image.
- a medical image photographing apparatus characterized in that the recommended photographing section is calculated using information on an anatomical feature structure and information on the second anatomical feature structure.
- the examination time can be extended without changing the conventional examination flow.
- FIG. 1 It is a block diagram which shows the typical structure of the MRI apparatus of 1st embodiment. It is a functional block diagram of the computer of a first embodiment.
- (A)-(c) is a figure which shows an example of the scout image of 1st embodiment. It is a flow of the recommendation photography section calculation processing of a first embodiment.
- (A) is a figure for demonstrating the coronal midline calculation process of 1st embodiment
- (b) is a figure for demonstrating the axial image determination process of 1st embodiment.
- (A)-(c) is a figure for demonstrating the axial midline calculation process of 1st embodiment.
- (A)-(c) is a figure for demonstrating the median plane determination process of 1st embodiment.
- (A)-(c) is a figure for demonstrating the preparation procedure of the template model of 1st embodiment.
- (A), (b) is a figure for demonstrating fitting of the template model of 1st embodiment.
- (A), (b) is a figure for demonstrating the recommended imaging
- (A), (b) is a figure for demonstrating the measurement preparation process of 1st embodiment.
- (A), (b) is a figure for demonstrating the measurement preparation process of 1st embodiment.
- FIG. 1 is a block diagram showing a typical configuration of an MRI apparatus 100 according to the present embodiment for realizing this.
- the MRI apparatus 100 of the present embodiment includes a magnet 101 that generates a static magnetic field, a gradient magnetic field coil 102 that generates a gradient magnetic field, and an RF coil that irradiates a subject (living body) 103 with a high-frequency magnetic field pulse (hereinafter referred to as an RF pulse). 107, an RF probe 108 for detecting an echo signal generated from the subject 103, and a bed (table) 115 on which the subject (for example, a living body) 103 is placed in a static magnetic field space generated by the magnet 101. .
- the MRI apparatus 100 of the present embodiment includes a gradient magnetic field power source 105 that drives the gradient magnetic field coil 102, a high-frequency magnetic field generator 106 that drives the RF coil 107, and a receiver that receives echo signals detected by the RF probe 108.
- a sequencer 104 that sends commands to the gradient magnetic field power source 105 and the high frequency magnetic field generator 106 to generate a gradient magnetic field and a high frequency magnetic field, respectively, and sets a nuclear magnetic resonance frequency as a reference for detection in the receiver 109;
- a computer 110 that performs signal processing on the detected signal, a display device 111 that displays a processing result in the computer 110, a storage device 112 that stores the processing result, and an input device 116 that receives an instruction from an operator. And comprising.
- an RF pulse is applied to the subject 103 through the RF coil 107 under the control of the sequencer 104, and a gradient magnetic field for providing position information such as slice selection and phase encoding to the echo signal.
- a pulse is applied by the gradient coil 102.
- a signal generated from the subject 103 is received by the RF probe 108, and the detected signal is sent to the computer 110, where signal processing such as image reconstruction is performed.
- the storage device 112 may store not only the signal processing result but also the detected signal itself, imaging conditions, and the like as necessary.
- the MRI apparatus 100 may further include a shim coil 113 and a shim power source 114 that drives the shim coil 113 when the static magnetic field uniformity needs to be adjusted.
- the shim coil 113 includes a plurality of channels, and generates an additional magnetic field that corrects the static magnetic field nonuniformity by the current supplied from the shim power supply 114.
- the sequencer 104 controls the current that flows through each channel that forms the shim coil 113 when adjusting the static magnetic field uniformity.
- sequencer 104 controls the operation of each unit constituting the MRI apparatus 100 as described above to perform measurement, and controls the respective units to operate at preprogrammed timing and intensity.
- a program that describes a high-frequency magnetic field, a gradient magnetic field, and the timing and intensity of signal reception is called a pulse sequence.
- the measurement is performed according to a pulse sequence and imaging parameters necessary for controlling the pulse sequence.
- the pulse sequence is created in advance and stored in the storage device 112, and the imaging parameters are input from the operator via the user interface.
- the computer 110 performs not only signal processing for processing the received signal but also control of the operation of the entire MRI apparatus 100. Further, the computer 110 according to the present embodiment constitutes an information processing apparatus together with the storage device 112, and calculates a recommended photographing section (recommended photographing section) from the photographing section setting image (scout image).
- FIG. 2 shows a functional block diagram of an information processing apparatus configured by the computer 110 and the storage device 112 of the present embodiment for realizing this.
- the information processing apparatus of this embodiment includes a control unit 200 and a storage unit 300.
- the control unit 200 includes a user interface (UI) control unit 210, a signal processing unit 220, a measurement control unit 230, and an imaging section determination unit 240.
- the storage unit 300 stores information necessary for various processes realized by the control unit 200.
- the imaging information storage unit 310, the optimum scout imaging information storage unit 320, and the recommended imaging section calculation information storage unit 330 Is provided.
- the imaging information storage unit 310 various kinds of information necessary for executing an inspection by the MRI apparatus 100, for example, a protocol, is registered.
- a protocol In general, in the examination by the MRI apparatus 100, scout imaging for acquiring a scout image, preparation imaging for adjustment of static magnetic field inhomogeneity and coil sensitivity correction, and main imaging for acquiring a diagnostic image of a determined imaging section are sequentially performed. Executed. Each imaging is composed of one or more measurements, and each measurement is performed according to a pulse sequence and imaging parameters.
- the protocol defines the imaging order, the measurement order within each imaging, and the measurement type in each examination, and is created and stored by the operator prior to the execution of the examination.
- the protocol is created according to the examination site such as the head, lumbar vertebra, knee, and shoulder, and the target disease, and includes a pulse sequence to be executed for each imaging and its imaging parameters.
- the imaging information storage unit 310 registers a pulse sequence used for protocol generation, imaging parameters input from an operator, and the like.
- registered pulse sequences include FSE (Fast Spin Echo), GrE (GradientEcho), EPI (Echo Planar Imaging), and the imaging parameters include TR (repetition time), TE (echo time), When photographing FOV (field of view), slice thickness, number of slices, and a plurality of sections, there are the order of photographing.
- the protocol may be configured so that the operator creates for each examination via the user interface and registers it in the imaging information storage unit 310, or is created in advance for each examination site and / or disease, It may be stored in the storage unit 310. In this case, the operator extracts and determines from protocols stored for each examination. It should be noted that an optimal protocol is associated with each examination site and stored in the imaging information storage unit 310, and when the operator specifies an examination site when setting imaging parameters, a protocol stored in association with the examination site is stored. It may be configured to be extracted as an initial value of the optimum protocol.
- the optimum scout imaging information storage unit 320 when there are examination types having different types of imaging sections for each examination site and for each examination site, the optimum scout imaging procedure for each examination site and examination type is stored.
- the specified optimum scout shooting information is registered. Specifically, the pulse sequence used in scout imaging, imaging parameters, the cross section to be imaged, and the imaging order are registered when imaging a plurality of cross sections. Note that the optimum scout shooting can be selected and set by the operator when creating a protocol. Or you may comprise so that it may be contained in the initial value of said optimal protocol.
- the recommended photographing section calculation information storage unit 330 information used for calculating a recommended photographing section from a scout image is registered. For example, an algorithm to be executed for generating a recommended imaging section from a scout image is registered according to the examination site. In addition, the type of image processing executed in the algorithm, the anatomical feature structure used to calculate the recommended imaging section, and the positional relationship between the anatomical feature structure and the recommended imaging section according to the examination site are registered. The positional relationship between the anatomical feature structure and the recommended photographing section may be configured so that the operator can set it.
- the anatomical feature structure and recommended imaging sections for each mark name (OM line, intervertebral disc line, etc.) and examination type (routine examination, epilepsy examination, etc.) May be held as an imaging cross-section list so that the operator can select each pulse sequence for actual imaging when creating a protocol.
- a graphical interface (GI) displayed on the display device 111 may be provided so that the operator can visually confirm the relationship between the imaging section and the anatomical landmark position when selecting from the imaging section list. Good. Further, a position adjustment input may be received on this GI.
- the anatomical feature structure is, for example, the midline, head contour, brain contour, corpus callosum, bridge, brainstem, pituitary gland, tilt base, lumbar spine if the examination site is the head, Intervertebral disc position, if knee, femoral medial condyle, femoral lateral condyle, femur, tibial location, line connecting medial femoral condyle and lateral femoral condyle, joint surface between femur and tibia , For shoulder, supraspinatus, head of head, scapula, acromion, clavicle position, line parallel to supraspinus, line along humerus, tangent of joint surface between head and scapula, bone head and For example, a line connecting the shoulder blades.
- These anatomical feature structures are predetermined and registered according to the examination site.
- the UI control unit 210 controls user interfaces such as the input device 116 and the display device 111, and performs user interface processing such as presenting a processing result to the operator and receiving input from the operator.
- the signal processing unit 220 processes the echo signal acquired by the MRI apparatus 100 and reconstructs an image. Further, the echo signal is processed, control values necessary for imaging such as the center frequency and the RF irradiation intensity are calculated, and transmitted to the sequencer 104 to the apparatus.
- the measurement control unit 230 reads a pulse sequence to be executed and imaging parameters to be used according to a protocol created by an operator and registered in the imaging information storage unit 310, gives an instruction to the sequencer 104, and executes measurement.
- the imaging section determination unit 240 determines an imaging section in the actual imaging based on the scout image.
- the imaging section determination unit 240 of the present embodiment includes a recommended imaging section calculation unit 241 that calculates a recommended imaging section from a scout image.
- the recommended photographing section calculation unit 241 includes an anatomical feature structure extraction unit 242 that extracts a predetermined anatomical feature structure on the two-dimensional image and each anatomical feature structure on the two two-dimensional images.
- a slice plane determination unit 243 that determines a new slice plane.
- the recommended imaging section calculation unit 241 calculates a recommended imaging section from a scout image obtained by scout imaging executed according to the optimum scout imaging information according to an algorithm registered in the recommended imaging section calculation information storage unit 330.
- the anatomical feature structure extraction unit 242 performs a recommendation by image processing stored in the recommended imaging section calculation information storage unit 330 from a two-dimensional image such as a scout image in accordance with an algorithm stored in the recommended imaging section calculation information storage unit 330.
- the anatomical feature structure stored in the imaging section calculation information storage unit 330 is extracted.
- the slice plane determination unit 243 uses the anatomical feature structures extracted from the image group parallel to the two slice planes intersecting each other according to the algorithm stored in the recommended photographing slice calculation information storage unit 330, and uses these slices. A new slice plane that intersects any plane is determined.
- the computer 110 includes a CPU and a memory, and each function of the control unit 200 realized by the computer 110 is realized by the CPU loading a program stored in the storage device 112 to the memory and executing the program.
- the storage unit 300 is realized on the storage device 112. Note that all or part of each function is a general-purpose information processing apparatus provided independently of the MRI apparatus 100, and may be realized by an information processing apparatus capable of transmitting and receiving data to and from the MRI apparatus 100. Good. Similarly, all or part of the storage unit 300 may be realized by an external storage device that is provided independently of the MRI apparatus 100 and capable of transmitting and receiving data to and from the MRI apparatus 100.
- the recommended imaging section calculation processing executed by the recommended imaging section calculation unit 241 according to the algorithm registered in the recommended imaging section calculation information storage unit 330 will be described using a specific example.
- a case of routine inspection of the head will be described as an example.
- the main photographing is assumed to acquire a T1-weighted image, a T2-weighted image, a FLAIR image, and a diffusion-weighted image.
- the imaging section is set to an area that is perpendicular to the median plane and has an inclination parallel to the OM line and covers the whole brain.
- the OM line is a line that connects the nose root portion on the image of the median plane and the lower portion of the bridge end, and is a line that is easier to recognize as the image is on a plane closer to the median plane. For this reason, the photographing section is determined on the median plane image.
- the optimum scout imaging information storage unit 320 what can determine the median plane and obtain a median plane image is registered as the optimum scout imaging information for the routine inspection of the head. For example, using a T1-weighted GrE (gradient echo) pulse sequence, registration is performed so that a plurality of slices parallel to each surface are photographed in the order of the coronal surface, the axial surface, and the sagittal surface.
- the number of slices is not limited here, but the following description will be given taking as an example the case of photographing five slices.
- FIG. 3 shows an example of a scout image acquired using this pulse sequence.
- 3A is an image 301 of a slice parallel to the coronal plane (coronal image) 301, FIG.
- FIG. 3B is an image of a slice parallel to the axial plane (axial image) 302, and FIG. 3C is a sagittal plane. Is an image (sagittal image) 303 of a slice parallel to the.
- a coordinate axis 304 is shown at the lower left of each image.
- the body axis direction is the z-axis direction
- the subject 103 is placed on the table 115 horizontally
- the direction parallel to the horizontal plane is selected from the two directions perpendicular to the z-axis.
- the x-axis direction and the direction perpendicular to the horizontal plane are defined as the y-axis direction.
- the recommended photographing section calculation information storage unit 330 determines a median plane from the coronal image and the axial image, generates a median plane image from the sagittal image, and calculates a recommended photographing section on the median plane image. Is registered. Then, the head contour, brain contour, corpus callosum, bridge, brain stem, pituitary gland, and scapula on the median and median plane images are registered as anatomical feature structures, and the median from each scout image is used as image processing. And those for specifying a recommended photographing section on the median plane image are registered.
- FIG. 4 shows a flow of recommended imaging section calculation processing executed by the recommended imaging section calculation unit 241 in accordance with the algorithm registered in the recommended imaging section calculation information storage unit 330 in the head routine inspection.
- the anatomical feature structure extraction unit 242 calculates the slope of the median line on the coronal image (step S401).
- the recommended photographing section calculation unit 241 determines the position of the axial image suitable for image processing on the coronal image (step S402).
- the anatomical feature structure extraction unit 242 calculates the position of the median line on the axial image at the position determined in step S402 (step S403).
- the slice plane determination unit 243 determines a median plane from the slope of the median line obtained in step S401 and the median line obtained in step S402 (step S404).
- the recommended photographing section calculation unit 241 refers to the sagittal image, analyzes the validity of the median plane obtained in step S404 (step S405), and determines that it is appropriate (step S406), from the sagittal image. A median plane image is created (step S407). Then, the recommended photographing section calculation unit 241 specifies a recommended photographing section on the median plane image (step S408), and ends the process. On the other hand, if it is determined in step S406 that it is not appropriate, the processing is terminated without performing the processing after step S407.
- FIG. 5A is a diagram for explaining coronal median line calculation processing according to the present embodiment.
- a rough slope of the midline is calculated.
- all five acquired coronal images are added to create an added image 501.
- binarization processing is performed using a threshold value, and the head region 502 and the background region 503 are separated on the added image 501.
- an average value of pixel values of all the pixels on the added image is used as the threshold value.
- a pixel region having a value equal to or greater than the threshold value is referred to as a head region 502, and a region having a value less than the threshold value is referred to as a background region 503.
- the pixel coordinates in the head region 502 are extracted, the coordinate values are plotted (504), and the least square fitting is performed with a linear function.
- the slope 505 of the linear function obtained by this fitting is set as a rough slope of the median line on the coronal image. This is a technique using the property that the shape of the head is almost symmetrical on the coronal plane, and is not affected by the contrast of the image.
- coronal midline calculation process is not limited to this.
- Various methods of image processing can be used. For example, an evaluation function based on a combination of a pixel value and a differential value of the pixel may be created, a median line may be calculated, and the slope may be determined.
- a one-dimensional projection image 511 on the x-axis and a one-dimensional projection image 521 on the z-axis of the addition image 501 are created.
- the head is determined from the one-dimensional projection image 511 on the x-axis, and the x-coordinates at both ends and the width 512 therebetween are determined.
- the x coordinate and the width 512 are calculated by threshold processing. That is, a pixel group having a pixel value in the range of the threshold value 513 or more in the one-dimensional projection image 511 is determined as the head width 512.
- the threshold 513 a value determined by a predetermined method such as an average value of pixel values of all the pixels on the added image 501 is used.
- the reciprocal differential value 522 is calculated, the point having the maximum value is obtained, and the z-coordinate of the head vertex 531 is determined.
- the x coordinate of the head vertex 531 is the midpoint of the x coordinates at both ends of the head.
- the coordinates of a point 532 that is separated from the head vertex 531 by a width 512 along the inclination of the median line determined by the coronal median line calculation process are calculated.
- An axial image of a slice plane within a predetermined range between the head vertex 531 and the point 532 is selected as an axial image suitable for image processing.
- the predetermined range for example, if the distance (head width 512) between the head vertex 531 and the point 532 is L, the range from the head vertex 531 is the range 533 between the position of L / 4 and the position of 3L / 4. Select one or more axial images to be shot. In the selection of the axial image, each slice position 534 of the slice plane parallel to the axial plane for acquiring the five axial images previously registered as the imaging parameters is used.
- FIGS. 6A to 6C are diagrams for explaining the axial midline calculation processing.
- the binarization process is performed on the selected axial image by a threshold in the same manner as the coronal midline calculation process, and the head region and the background are selected. Separate the area. Further, the region that is the head region is divided into two or more groups according to the size of the pixel value. The number of groups of gradation adjustment images 601 in which a fixed value is assigned as a pixel value for each group is created. Large pixel values such as blood vessels and fat regions can be smoothed by the process of generating the gradation adjustment image 601. Thereafter, the gradation adjustment images 601 are added to create an added image 602.
- the center of gravity 603 of the added image 602 is calculated.
- the center of gravity 603 is calculated by a generally used image processing method. For example, a method is used in which the pixel value is calculated by weighting, or the pixel value of the region extracted as the head region in the added image 602 is uniform and calculated only by coordinates.
- a one-dimensional projection image 604 of the addition image 602 on the x-axis is created, and the head width 605 and the x-coordinates of both ends are determined using threshold values as in the axial image selection process.
- the addition image 602 is rotated in a predetermined increment in the range of ⁇ 90 degrees to +90 degrees on both sides of the predetermined reference line with the center of gravity 603 as the center.
- a one-dimensional projection image 604 on the x-axis is created for each angle 606 formed by The reference line is, for example, the y axis.
- the x of the point 608 having the minimum brightness in the range of the width 607 that is 1 ⁇ 2 of the width 605 of the head, with the center of the x coordinate at the both ends of the head determined in advance as the center. Extract the coordinates and the brightness of the point. Then, the extracted luminance is plotted 609 in association with the angle 606 of the projected image 604.
- the angle 606 of the projection image 604 having the minimum luminance at the point 608 is specified. Let this be the slope ⁇ 610 of the median line in the axial image.
- the coordinates (XP, YP) of P611 are calculated respectively.
- a straight line passing through the point P611 and having an angle ⁇ 610 is defined as a median line 612 in the axial image.
- the pixel values of the pixels in the area corresponding to the midline on the axial image are converted into the pixel values of the surrounding brain parenchyma.
- the midline pixel values it is a technique using the low thing.
- the pixel value of the median line is higher than the pixel value of the brain parenchyma, a process of calculating a high luminance value in the one-dimensional projection image is performed.
- the size of the pixel value is used as an evaluation function.
- the edge information obtained by differentiating the one-dimensional projection image 604 may be used.
- information on the standard deviation of the one-dimensional projection image 604 may be used.
- these may be combined and processed. By combining these, more accurate midline extraction becomes possible.
- the axial image is an image close to the lower brain
- a different method may be used for the midline extraction. That is, as shown in FIG. 6C, a line parallel to the x-axis passing through the center of gravity is used to divide the axial image into a front wall side region 621 and a rear wall side region 622.
- the sum of the pixel values of the area 621 on the front wall side is calculated, and the image is rotated at predetermined intervals in the range of ⁇ 90 degrees to +90 degrees on both sides of the predetermined reference line with the center of gravity as the center.
- the sum of pixel values is calculated for each step.
- the rotation angle at which the calculated sum is minimized is the slope of the median line, and the center of gravity is the point through which the median plane passes.
- This method uses the fact that the axial value close to the brain low has a low pixel value in the nasal cavity region and a high pixel value in the eyeball and cerebellum region.
- the median plane almost passes through the center of gravity without depending on the inclination of the head. Whether or not the axial image is an image close to the lower brain part can be determined from the position of the axial image. For example, when the selected axial image is not more than the third image counted from the top of the head, it can be determined that the selected image is close to the lower brain.
- FIGS. 7A to 7C are diagrams for explaining the median plane determination process.
- the midline is determined by the slope 505 of the midline on the coronal image 501 determined by the coronal midline calculation process and the midline 612 on the axial image 602 determined by the axial midline calculation process.
- Determine the initial position of the surface That is, a plane that satisfies both the midline inclination 505 on the coronal image 501 and the midline 612 on the axial image 602 is defined as an initial position of the midline (initial midplane).
- the pixel value on the intersection line 701 is used as an evaluation function, and the inclination and position of the initial median plane are changed and adjusted so that the evaluation function is minimized.
- a plane having an inclination and a position where the evaluation function is minimized is taken as a median plane.
- the evaluation function may be combined with first-order differentiation, second-order differentiation of pixel values, and the like. Thereby, extraction accuracy can be improved. Further, in order to improve the accuracy of evaluation, it is desirable that the intersection line 701 is an intersection line only in the brain region.
- the brain region is, for example, a range of a circle between the head vertex 531 and the point 532 in the coronal image and a circle whose diameter is the head width 605 around the center of gravity in the axial image.
- the coronal image and the axial image may be binarized using the average value of the pixel values as a threshold value, divided into a signal region and a background region, and the signal region may be a brain region.
- a median plane image creation process for creating a median plane image from a sagittal image by the recommended photographing section calculation unit 241 in step S407 will be described.
- pixel values of the median plane determined in step S404 are obtained by interpolation using pixel values of five sagittal images obtained by scout shooting.
- the positions of the five sagittal images are set as slice positions of five slices parallel to the sagittal plane at the time of scout shooting in the shooting parameters.
- the slice position of the image may be configured as the median plane. With this configuration, the processing time can be shortened.
- the cross-section specifying process for specifying the recommended shooting cross section on the median plane image created by the recommended shooting cross-section calculating unit 241 in step S408 will be described.
- the position of the anatomical feature point on the median plane image is automatically recognized, and the imaging section is determined according to the information on the relationship between the position of the predetermined anatomical feature point and the imaging section.
- Automatic recognition is performed by fitting processing using a template model that can be deformed corresponding to the difference in shape of each solid.
- the template model to be used is composed of a plurality of points, and each point corresponds to an anatomical feature point on the median plane image.
- the template model is fitted to the median plane image, the position of each point constituting the template model is calculated, and the position of the anatomical feature point on the median plane image is extracted.
- median plane images 810 of a plurality of subjects are acquired.
- a plurality of anatomical feature points (marking points) 801 such as the head contour, corpus callosum, lower cerebrum, pituitary gland, scapula, bridge, medulla, lower cerebellar border, etc. Extract coordinates.
- the subject here is preferably a healthy person, and the number of subjects is preferably proportional to the number of landmarks 801 to be extracted.
- the size and inclination of the distribution of the extracted mark points 801 of each subject are standardized by rotation, scaling, and parallel movement. With respect to the standardized position of the mark point 801, an average value among a plurality of subjects is calculated, and this is set as a standard model 820 as shown in FIG.
- the coordinates of all mark points 801 of each subject and the standard model 820 are converted into a one-dimensional vector, a variance-covariance matrix is created, and then eigenvalues and eigenvectors of the matrix are calculated.
- the eigenvector calculated here is a vector indicating the direction in which individual differences are seen in the distribution of the landmarks 801 of the subject.
- a one-dimensional vector of the standard model 820 represents the X VC
- template model parameterized variation tendency of the individual differences The one-dimensional vector X is expressed by the following equation (2).
- b is a parameter that determines the magnitude of the change.
- the standard model 820 can cope with individual differences in shape by adjusting the value of b.
- the template model 800 is obtained by adjusting the value of b and changing the shape of the standard model 820.
- the value of b can be set arbitrarily.
- the range of b may be set to a range represented by the following expression (3). ⁇ 3 ⁇ i ⁇ b i ⁇ 3 ⁇ i (3)
- ⁇ 3 ⁇ i ⁇ b i ⁇ 3 ⁇ i (3) As described above, by limiting the value of b, it is possible to prevent the standard model 820 from being greatly deviated from the initial shape when the template model 800 is created by deforming the standard model 820.
- eigenvectors with larger eigenvalues tend to have greater individual differences, only eigenvectors with larger eigenvalues may be incorporated into the standard model 820. With this configuration, the calculation time can be shortened.
- a fixed shape template model in which individual differences are ignored may be used. Thereby, a rough position can be calculated at high speed.
- the template model 800 is created by the operator using the standard model 820 registered in the recommended photographing section calculation information storage unit 330 in advance. Alternatively, it may be created in advance and stored in the recommended photographing section calculation information storage unit 330.
- the template model 800 may be created and held for each race, sex, age, and the like. Thereby, feature extraction with higher accuracy is possible.
- the information may be managed in association with any information registered at the time of examination as subject information and automatically set at the time of examination.
- An interface that can be selected by the operator may be provided.
- the template model 800 to be used may be configured to be freely interchangeable at any time.
- the center of gravity 902 of the median plane image 901 is calculated.
- a one-dimensional projection image 903 on the z-axis is created, and the head length 904 is calculated in the obtained primary projection image 903.
- contour coordinates 905 on the front wall side are extracted by threshold processing.
- the extracted contour coordinates 905 are subjected to least square fitting with a linear function 906.
- a perpendicular is drawn from the center of gravity 902 to the obtained linear function 906, and contour coordinates 908 on the front wall side are extracted again by threshold processing in a range determined by the length 904 of the head around the intersection 907 with the perpendicular. .
- the extracted contour coordinates 908 are subjected to least square fitting again with the linear function 910, and the inclination 911 is obtained.
- the slope 911 of the linear function 910 may be obtained by a method of extracting the coordinates of the head region by threshold processing and fitting with a linear function.
- a one-dimensional projection image 912 on the y-axis is created, and the head width 913 is calculated by threshold processing. As shown in FIG.
- the median 902 is based on the center of gravity 902, the inclination 910, and the head width 904 thus obtained. It is arranged at a position close to the same landmark point 801 on the surface image.
- the fitting first repeats the process of template model deformation by searching for the update point and rotating, scaling, and translating the points on the head contour, and then for all the points on the template model 800, It repeats the search of update points and the process of model deformation by rotation, scaling, and translation. Finally, at all points on the template model 800, deformation by parameters indicating individual differences is also added, and the model deformation process is repeated.
- each landmark point 801 of the template model 800 converges to the corresponding anatomical feature point on the median plane image 901 on which the process is performed, as shown in FIG.
- the coordinates of the mark points 801 of the template model 800 at this time are the coordinates of the anatomical feature points necessary for determining the imaging section.
- anatomical feature points on the median plane image are automatically recognized.
- anatomical feature points necessary for determining the recommended imaging section are extracted according to the positional relationship between the recommended imaging section and the anatomical feature structure registered in the recommended imaging section calculation information storage unit 330, and recommended. Determine the cross section.
- the nose root part, the bridge, the head outline, the brain outline, the corpus callosum, the point determining the brain stem, etc. are registered as anatomical feature structures, and the OM line 1002 connecting the nose root part and the lower bridge end is registered.
- the inclination is the inclination of the recommended imaging section, and the whole brain range 1003 is registered as the recommended imaging section range.
- the recommended photographing section inclination 1004 and range 1005 are determined from the position of each mark point 801 of the template model 800 after fitting on the median plane image.
- FIG. 10 shows only the shooting range in the vertical direction, the position information can be acquired in the same manner for the shooting range in the front-rear direction.
- the plane parallel to the OM line is determined as the inclination of the recommended photographing section, the present invention is not limited to this.
- an AC-PC line connecting the anterior commissure on the median plane image, a line parallel to the brain stem, and the like may be registered as the inclination of the recommended photographing section.
- FIG. 11 to FIG. 13 are diagrams for explaining the measurement preparation processing of this embodiment, FIG. 11 is a diagram for scout shooting, and FIG. 12 and FIG. 13 are diagrams for explaining the flow of subsequent processing. It is.
- the protocol for head routine inspection is as follows. Scout imaging is performed, and then preliminary imaging including a pulse sequence for acquiring data for shimming and sensitivity map correction is performed. Then, the main photographing is performed with the photographing cross section determined by the result of the scout photographing.
- the UI control unit 210 receives an instruction from the operator. Then, the measurement control unit 230 outputs a command to the sequencer 104 in accordance with the pulse sequence and the imaging parameters of the optimum scout imaging information stored in the optimum scout imaging information storage unit 320 (step S1201).
- the sequencer 104 operates each unit in accordance with an instruction from the computer 110 and starts scout imaging (step S1301).
- the sequencer 104 sequentially measures in the order of the coronal plane, the axial plane, and the sagittal plane, and sequentially obtains the obtained echo signals. It transmits to the computer 110 (steps S1302, S1303, S1304).
- the signal processing unit 220 reconstructs the image and obtains a coronal image (step S1202). Then, on the obtained coronal image, the recommended photographing section calculation unit 241 calculates the inclination of the median line (step S1203). Further, the recommended photographing section calculation unit 241 determines the position of the axial image suitable for image processing on the coronal image (step S1204). Note that the recommended photographing section calculation unit 241 according to the present embodiment performs the processing up to step S1204 before the measurement of the axial plane by the measurement control unit 230 is completed.
- the signal processing unit 220 reconstructs the image and obtains an axial image (step S1205). Then, the recommended photographing section calculation unit 241 identifies a median line on the axial image at the position determined in step S1204 in the obtained axial image (step S1206). Then, the recommended photographing section calculation unit 241 specifies the median plane from the inclination of the median line on the coronal image calculated in step S1204 and the position of the median line on the axial image calculated in step S1206 (step S1207). . Note that the recommended photographing section calculation unit 241 of the present embodiment performs the processing up to step S1207 before the measurement control unit 230 completes the measurement of the sagittal plane.
- the signal processing unit 220 reconstructs the image and obtains a sagittal image (step S1208).
- the UI control unit 210 causes the display device 111 to display a display for accepting an instruction as to whether or not to perform scout shooting again together with the reconstructed scout image (coronal image, axial image, sagittal image) (step S110). S1209).
- the operator confirms the scout image displayed on the display device 111 (step S1102), and instructs whether or not to retake the scout image (step S1103).
- the recommended photographing section calculation unit 241 analyzes and determines the validity of the median plane obtained in step S1207 while referring to the sagittal image (step S1210).
- the UI control unit 210 displays an operation button for accepting an instruction for re-acquisition and processing continuation along with the scout image on the display device 111 and accepts the re-acquisition instruction.
- the validity of the median plane in step S1210 is determined based on whether the median plane image can be created from the sagittal image reconstructed in step S1208, or whether the median plane specified in step S1207 is anatomically valid. It is determined by whether or not. If a median plane image can be created and is anatomically valid, it is determined that the median plane is valid. Whether or not the image can be created is determined based on, for example, a ratio in which the median plane specified in step S1207 is included in the imaging range of the five sagittal images acquired in step S1208. That is, when the ratio obtained by calculation is greater than or equal to a predetermined value (for example, 75% or more), it is determined that creation is possible, and otherwise it is determined not.
- a predetermined value for example, 75% or more
- the median plane position is significantly different from the center of the head determined from the coronal image and the axial image (for example, the distance from the head center to the median plane is coronal). It is discriminated based on whether or not it is 1/4 or more of the width of the head calculated from the image. That is, when it corresponds to a position greatly deviated, it is determined that it is not appropriate.
- FIG. 12A further shows the flow of processing when it is determined in step S1210 that the median plane is appropriate.
- the calculator 110 causes the recommended shooting section calculation unit 241 to Then, an image of the position of the median plane (median plane image) is generated from the sagittal image (step S1222), and a recommended photographing cross section is calculated on the generated image (step S1223). Meanwhile, the operator gives an instruction to start preparation shooting (step S1121).
- the UI control unit 210 receives an instruction from the operator, and the measurement control unit 230 outputs a command to the sequencer 104 in accordance with a pulse sequence and imaging parameters that are stored in advance for preparation imaging (step S1221). .
- the sequencer 104 operates each unit in accordance with an instruction from the computer 110 and performs preparatory shooting (step S1321).
- the computer 110 performs the processing of steps S1222 and S1223 after the start of sequential shooting.
- the processing of steps S1222 and S1223 is waited for the operator's instruction to start preparation shooting. Go ahead.
- the computer 110 sets information for specifying the recommended photographing section calculated in step S1223, for example, position, inclination, and actual photographing.
- the UI control unit 210 causes the display device 110 to display a recommended imaging cross-sectional area, a scout image, and the like based on the imaging parameters (number of slices, slice thickness, FOV, etc.) (step S1224).
- the operator performs input for adjusting the displayed recommended photographing section as necessary (step S1123).
- the UI control unit 210 receives an input of adjustment, adjusts the imaging section position according to the adjustment amount received by the imaging section determination unit 240, and determines the final imaging section of the main imaging (step S1225). At this time, the configuration may be such that the imaging parameters related to the imaging section of the main imaging are updated according to the determined imaging section.
- measurement control unit 230 issues a command to the sequencer in accordance with a pulse sequence and shooting parameters previously stored for main shooting (step S1226).
- the sequencer 104 operates each unit in accordance with an instruction from the computer 110 to perform the main photographing (step S1322).
- the imaging section determination unit 240 displays the adjusted imaging section on the display device 111 as the recommended imaging section, and input the adjustment again. You may comprise so that it may receive. In this case, until the instruction for starting the main photographing is received from the operator, the adjusted photographing section is repeatedly displayed on the display device 111 as the recommended photographing section so that the adjustment can be input.
- step S1131 the operator gives an instruction to start preparation shooting (step S1131).
- the UI control unit 210 receives an instruction from the operator, and the measurement control unit 230 outputs a command to the sequencer 104 according to the pulse sequence and imaging parameters that are stored in advance for preparation imaging (step S1231). .
- the sequencer 104 operates each unit in accordance with an instruction from the computer 110 and performs preparatory shooting (step S1331).
- the UI control unit 210 When the operator performs an operation for opening the photographing section setting screen for the actual photographing (step S1132), in the computer 110, the UI control unit 210, as in the past, the photographing parameters set as the scout image (number of slices, slice thickness, FOV). Etc.) is displayed on the display device 110 by axial disconnection (step S1232). The operator inputs an imaging section on the displayed axis cut (step S1133).
- the UI control unit 210 receives an input of adjustment, determines an imaging section according to the input received by the imaging section determination unit 240, and updates an imaging parameter related to the imaging section of the main imaging according to the imaging section. (Step S1233).
- the photographing parameters set as the scout image number of slices, slice thickness, FOV). Etc.
- the adjustment may be input any number of times.
- the measurement control unit 230 issues a command to the sequencer according to the pulse sequence and shooting parameters previously stored for the main shooting (step S1234).
- the sequencer 104 operates each unit in accordance with an instruction from the computer 110 to perform main imaging (step S1332).
- FIG. 13A is a diagram for explaining the flow of the measurement preparation process when it is determined in the analysis of step S1210 that the median plane is anatomically valid.
- the recommended photographing section calculating unit 241 calculates each section for scout photographing that can acquire the median plane specified in step S1207 as a recommended scout photographing section (step S1241).
- the UI control unit 210 accepts it and specifies the scout image and the calculated recommended scout imaging section on the display device 111. Information is displayed (step S1242). Here, it is not always necessary for the operator to open the scout shooting setting screen.
- the operator automatically switches to the scout shooting setting screen to display the scout image and the recommended scout shooting position. It may be configured. The operator performs input for adjusting the displayed recommended scout imaging section (step S1141).
- the UI control unit 210 receives an input of adjustment, and the imaging section determination unit 240 adjusts the recommended scout imaging section according to the received adjustment amount, and determines the final scout imaging section (step S1243).
- a configuration may be adopted in which imaging parameters related to the imaging section are updated according to the determined imaging section.
- it may be configured such that input of adjustments can be made any number of times. Thereafter, the processes after steps S1101, S1201, and S1301 are repeated.
- step S1103 an instruction to retake the scout imaging is accepted. Furthermore, in the analysis in step S1210, the flow of the measurement preparation process when it is determined that the median plane is not anatomically valid is shown in FIG. ).
- the UI control unit 210 receives it and displays a three-axis orthogonal section on the display device 111 (step S1251). . The operator performs input for adjusting the displayed three-axis orthogonal section in order to determine the scout imaging section (step S1152).
- the UI control unit 210 receives an input of adjustment, and the imaging section determination unit 240 determines a scout imaging section according to the received adjustment amount (step S1252).
- photography cross section may be sufficient.
- it may be configured such that adjustment input can be performed any number of times. Thereafter, the processes after steps S1101, S1201, and S1301 are repeated.
- the above is the flow of processing from the scout shooting start operation to the main shooting start operation in the case of head routine inspection.
- the measurement control unit 230 and the signal processing unit 220 set the first slice surface, which is one of the two slice surfaces intersecting each other, as a coronal surface, A first image group consisting of one or more parallel two-dimensional images and a second slice plane which is the other slice plane are taken as axial planes, and a first image group consisting of one or more two-dimensional images parallel to this axial plane. Acquire a second image group. Also, a fourth slice plane intersecting both the first slice plane and the second slice plane is defined as a sagittal plane, and a fourth image group consisting of one or more two-dimensional images parallel to the sagittal plane is acquired. To do.
- the anatomical feature structure extraction unit 242 determines the slope of the median line as the first anatomical feature structure from the first image group and the median line from the second image group. Then, the slice plane determination unit 243 determines the median plane as the third slice plane from the slope and median of the median line determined by the anatomical feature structure extraction unit 242.
- the recommended photographing section calculation unit 241 generates a two-dimensional image of the median plane determined from the fourth image group as a third image. Then, using a template model 800 composed of a plurality of anatomical feature points that should be included in the recommended imaging section, the positions of these anatomical feature points are specified on the third image, and recommended imaging section calculation information storage is performed The recommended imaging section is determined based on the positional relationship between the anatomical feature structure registered in advance in the unit 330 and the recommended imaging section.
- image processing is executed in parallel with scout shooting, and a recommended shooting section is calculated.
- the scout imaging to be executed is the same as the case where the imaging section is manually set from the scout image. Therefore, the recommended photographing section can be presented to the operator without changing the conventional inspection flow and without extending the processing time by adding a new process. Therefore, workability is not deteriorated in automatically obtaining the recommended photographing section.
- the scout shooting is retaken after setting a more appropriate scout shooting section, so that the scout shooting can be efficiently retaken.
- the processing time is not extended and is the same as the conventional procedure. The inspection efficiency will not deteriorate.
- a recommended photographing section calculation process in the case where an oblique plane that is generally different from three orthogonal slice planes for acquiring a scout image is set as a photographing section, such as the head, is taken as an example.
- a specific example of the recommended shooting section calculation processing when the shooting section is a plane that substantially matches one of the three slice planes from which the scout image is acquired will be described.
- the recommended imaging section calculation processing is executed by the recommended imaging section calculation unit 241 according to the algorithm, image processing, and anatomical feature structure registered in the recommended imaging section calculation information storage unit 330. Each will be described below.
- lumbar spine examination a T1-weighted image and a T2-weighted image of a sagittal plane (lumbar sagittal plane) and a T1-weighted image and a T2-weighted image of an intervertebral disc line are acquired. That is, there are two imaging sections: a lumbar sagittal surface and a surface including an intervertebral disc line (intervertebral disc line surface).
- the lumbar examination sagittal plane is a slice plane parallel to the spinal nerve
- the intervertebral disc line plane is a plane adapted to the inclination of each intervertebral disc located below each of the first to fifth lumbar vertebrae. Therefore, the lumbar examination sagittal surface is determined by the lumbar position and the inclination of the spinal nerve.
- the disc line plane is determined by the disc position and the inclination of the spinal nerve.
- the optimum scout imaging information storage unit 320 uses, for example, a proton-enhanced GrE pulse sequence as the optimum scout imaging information for the lumbar spine, and a plurality of parallel planes in the order of the axial plane, coronal plane, and sagittal plane. It is registered to shoot the slices (for example, 5 slices).
- an lumbar spine position is determined on an axial image
- an inclination of a spinal nerve is determined on a coronal image
- image processing, anatomical feature structure, and the position of the intervertebral disc to be imaged on the sagittal plane image of the lumbar spine, and the disc line plane is determined using the inclination of the spinal nerve previously determined on the coronal image Algorithms, image processing and anatomical feature structures are registered.
- the position of the lumbar spine that is, the position of the spinal nerve is determined by calculating the center of gravity of the image.
- the inclination of the spinal nerve is obtained from the coronal image using the pixel value evaluation function.
- a plane that passes through the position of the spinal nerve obtained from the axial image and has the inclination of the spinal nerve obtained from the coronal image is set as a recommended photographing section of the lumbar sagittal plane. Note that the processing so far is completed before the actual photographing.
- an image of the lumbar examination sagittal surface is created by interpolation or the like from the sagittal image obtained by scout photography.
- the position of the intervertebral disc is specified based on the edge enhancement and the pixel value evaluation function on the lumbar examination sagittal plane image.
- a plane that passes through the obtained position of the intervertebral disc and is orthogonal to the inclination of the spinal nerve is set as a recommended imaging section of the intervertebral disc line plane.
- the optimum scout imaging information storage unit 320 uses a GrE-based pulse sequence as the optimum scout imaging information for knee examination, and each of a plurality of slices (for example, 5 slices) in the order of the axial plane, sagittal plane, and coronal plane. Registered to shoot.
- a line connecting the femoral medial condyle and the femoral lateral condyle is specified in the axial image acquired at the beginning of scout imaging.
- a line perpendicular to the tangent of the joint surface of the femur and tibia is specified.
- a plane that is parallel to the line connecting the medial femoral condyle and the lateral femoral condyle and perpendicular to the tangent to the joint surface of the femur and tibia is taken as the recommended cross section of the knee coronal surface.
- determining the recommended photographing section a method similar to the median plane determination process in the head routine inspection is used. The same applies to the following.
- a line perpendicular to the line connecting the femoral medial condyle and the femoral lateral condyle is identified from the axial image obtained by the scout imaging. Further, an image of the knee coronal plane (knee coronal image) is created from the coronal image obtained by scout shooting by interpolation or the like. Note that the knee coronal image acquired by the actual photographing may be used. And the tangent of the joint surface of a femur and a tibia is specified on a knee coronal surface image.
- a plane perpendicular to the tangent line between the articular surfaces of the femur and tibia and perpendicular to the line connecting the femoral medial condyle and the femoral condyle is taken as the recommended imaging section of the knee sagittal surface.
- an image of the knee sagittal plane (knee sagittal image) is created by interpolation or the like from the sagittal image obtained by scout photography.
- the knee sagittal image may be acquired by actual photographing.
- An image depicting the anterior cruciate ligament is selected from the knee sagittal image, and a line along the anterior cruciate ligament on the knee sagittal image is specified.
- an image depicting the anterior cruciate ligament is selected from the knee coronal image, and a line along the anterior cruciate ligament on the knee coronal image is specified.
- a plane parallel to the anterior cruciate ligament on the knee sagittal image and parallel to the anterior cruciate ligament on the knee coronal image is set as a recommended photographing section of the diagnostic surface of the anterior cruciate ligament.
- a T1-weighted image of the coronal plane (shoulder-coronal plane), a T2-weighted image, a T1-weighted image of the sagittal plane (shoulder sagittal plane), a T2-weighted image, a T1-weighted image of the axial plane (shoulder axial plane),
- a T2-weighted image is acquired. That is, the photographing cross section of the shoulder inspection is the three surfaces of the shoulder coronal surface, the shoulder sagittal surface, and the shoulder axial surface.
- the optimum scout imaging information storage unit 320 uses a GrE pulse sequence as the optimum scout imaging information for shoulder examination, and images a plurality of slices (for example, 5 slices) in the order of the axial plane, sagittal plane, and coronal plane. Registered to do.
- an image in which the supraspinatus is depicted is selected from an axial image acquired at the beginning of scout imaging, and a line parallel to the supraspinatus is identified on the image.
- a line along the humerus is specified on a sagittal image obtained by scout photography.
- a plane parallel to the supraspinatus and parallel to the humerus is set as a recommended photographing cross section of the shoulder coronal plane.
- an image in which the head of the bone and the scapula are depicted is selected from the axial image obtained by the scout shooting, and a line perpendicular to the tangent of the joint surface is specified on the image.
- an image of the shoulder coronal plane (shoulder coronal image) is created from the coronal image obtained by scout shooting by interpolation or the like.
- the shoulder coronal image an image acquired by actual photographing may be used.
- a line perpendicular to the line connecting the bone head and the scapula is specified on the shoulder coronal image.
- a plane perpendicular to the line connecting the head of the head and the scapula and perpendicular to the tangent of the joint surface of the head of the head and the scapula is taken as the recommended photographing section of the shoulder sagittal surface.
- shoulder sagittal image an image of the shoulder sagittal surface (shoulder sagittal image) is created from the sagittal image obtained by scout photography by interpolation or the like.
- the shoulder sagittal image may be acquired by actual photographing.
- a straight line perpendicular to the line along the humerus is specified on the shoulder sagittal image.
- a straight line connecting the acromion and the clavicle is specified on the shoulder coronal image.
- a plane perpendicular to the humerus, parallel to the straight line connecting the acromion and the clavicle, and parallel to the tangent to the joint surface is taken as the recommended photographing section of the shoulder axial surface.
- the surface corresponding to the median surface is the lumbar sagittal surface in the case of the lumbar vertebra, the knee coronal surface in the case of the knee, and the shoulder coronal surface in the case of the shoulder. Accordingly, in step S1210, the validity of these surfaces is analyzed and determined.
- the measurement control unit 230 and the signal processing unit 220 use the first slice plane as an axial plane, the second slice plane as a coronal plane, and the fourth slice plane as a sagittal plane. Are obtained as a first image group, a second image group, and a fourth image group, respectively.
- the anatomical feature structure extraction unit 242 determines the position of the spinal nerve on the axial image as the first anatomical feature structure and the inclination of the spinal nerve on the coronal image as the second anatomical feature structure, respectively. ,Extract.
- the slice plane determination unit 243 determines a plane passing through the position of the spinal nerve and having the inclination of the spinal nerve as the lumbar sagittal plane, that is, the third slice plane.
- the recommended photographing section calculation unit 241 creates an image of the third slice plane that is the third image group by interpolation.
- the anatomical feature structure extraction unit 242 extracts the position of the intervertebral disc on the lumbar sagittal surface as a third anatomical feature structure.
- the slice plane determination unit 243 determines a fifth slice plane from the first anatomical feature structure or the first anatomical feature structure and the third anatomical feature structure, and recommends a recommended photographing section.
- the calculation unit 241 sets the fifth slice plane as a recommended photographing section.
- the measurement control unit 230 and the signal processing unit 220 use the first slice plane as an axial plane, the second slice plane as a sagittal plane, and the fourth slice plane as a coronal plane. Are obtained as a first image group, a second image group, and a fourth image group, respectively.
- the anatomical feature structure extraction unit 242 uses, as the second anatomical feature structure, a line connecting the femoral medial condyle and the femoral lateral condyle on the axial image as the first anatomical feature structure.
- the slice plane determination unit 243 determines the knee coronal plane specified by the first anatomical feature structure and the second anatomical feature structure as the third slice plane.
- the recommended photographing section calculation unit 241 creates a third image as an image of the third slice plane by interpolation or the like.
- the anatomical feature structure extraction unit 242 specifies the tangent of the indirect surface of the femur and the tibia as the third anatomical feature structure on the third image.
- the slice plane determination unit 243 determines the knee sagittal plane specified by the third anatomical feature structure and the fourth anatomical structure as the fifth slice plane, and the recommended photographing section calculation unit 241 Then, an image of the fifth slice plane is created by interpolation or the like as the fifth image.
- the anatomical feature structure extraction unit 242 extracts a line along the anterior cruciate ligament on the knee sagittal image as a fifth anatomical feature structure, and extracts a line along the anterior cruciate ligament on the knee coronal image as a sixth. It is extracted as an anatomical feature structure.
- the slice plane determination unit 243 determines a plane parallel to the fifth anatomical feature structure and parallel to the sixth anatomical feature structure as the sixth slice plane, and the recommended photographing section calculation unit 241
- the sixth slice plane is the recommended shooting section.
- the measurement control unit 230 and the signal processing unit 220 have the first slice plane as an axial plane, the second slice plane as a sagittal plane, and the fourth slice plane as a coronal plane, and parallel to these.
- One or more two-dimensional image groups are acquired as a first image group, a second image group, and a fourth image group, respectively.
- the anatomical feature structure extraction unit 242 applies a line parallel to the supraspinatus on the axial image as the first anatomical feature structure and the humerus on the sagittal image as the second anatomical feature structure.
- a line perpendicular to the tangent of the joint surface on the axial image is extracted as the fourth anatomical feature structure.
- the slice plane determination unit 243 determines the shoulder coronal plane specified by the first anatomical feature structure and the second anatomical feature structure as the third slice plane.
- the recommended photographing section calculation unit 241 creates a third image as an image of the third slice plane by interpolation or the like.
- the anatomical feature structure extraction unit 242 identifies a line perpendicular to the line connecting the head and the scapula as the third anatomical feature structure on the third image.
- the slice plane determination unit 243 determines the shoulder sagittal plane specified by the third anatomical feature structure and the fourth anatomical structure as the fifth slice plane, and the recommended photographing section calculation unit 241 Then, an image of the fifth slice plane is created by interpolation or the like as the fifth image.
- the anatomical feature structure extraction unit 242 extracts a straight line perpendicular to the line along the humerus on the shoulder sagittal image as a fifth anatomical feature structure, and connects the acromion and the clavicle on the shoulder coronal image. A straight line is extracted as the sixth anatomical feature structure.
- the slice plane determination unit 243 determines a plane parallel to the fifth anatomical feature structure and parallel to the sixth anatomical feature structure as the sixth slice plane, and the recommended photographing section calculation unit 241
- the sixth slice plane is the recommended shooting section.
- a case where a scout image is acquired by a pulse sequence for acquiring a T1-weighted image in which contrast between tissues in the head is clear is described as an example.
- the pulse sequence is not limited to this.
- a pulse sequence for obtaining a T2-weighted image may be used.
- the pixel value pattern of the image is different from that of the present embodiment, it is necessary to adjust the evaluation function in the image processing.
- the recommended imaging section calculation processing by the recommended imaging section calculation unit 241 is performed in parallel with the scout imaging is described as an example, but the present invention is not limited thereto.
- the recommended photographing section calculation processing may be performed after the completion of all scout photographing.
- a recommended slice section calculation process may be performed on the image of the slice plane, and the result may be reflected in the next slice plane shot.
- a function of recognizing the posture of the subject 103 and adjusting the measurement position of the next surface is provided.
- the slice position in the z-axis direction of the axial shooting is adjusted from the reconstructed image so that the axial image is within the above range, and the axial plane is measured.
- the sagittal plane is measured after the slice position is adjusted so as to include the position of the median plane calculated from the coronal image and the axial image.
- the scout imaging position is determined. You may comprise so that it may determine.
- the recommended photographing section calculation unit 241 omits the configuration for accepting the selection, proceeds as it is, and calculates a recommended photographing section. For example, in the case of a head routine inspection, if the analysis result of the median plane is not valid, it is recommended. You may comprise so that the message which tells that accuracy is unreliable with an imaging
- the processing may be advanced if the analysis result of the median plane is appropriate, and if it is not appropriate, a message recommending that the scout shooting be performed again may be displayed on the display device 111, and the processing may be terminated.
- the recommended imaging section calculation unit 241 may calculate a position where the median plane can be created, and automatically perform scout imaging again at this position. Further, when the median plane position is analyzed, if the recommended imaging section calculation unit 241 determines that the median plane is greatly inclined, a message recommending re-execution of scout imaging may be displayed at this time. According to these configurations, since the operator can determine whether the scout image is good or bad without checking the image, the inspection efficiency is improved.
- the shooting section determination unit 240 may be configured to determine the recommended shooting section as the shooting section as it is and execute the main shooting. For example, in the case of the head routine inspection, when the median plane is analyzed as appropriate, the main imaging start instruction is waited without displaying a screen for accepting an input of positioning setting.
- an imaging section may be set by an operator.
- the recommended photographing section calculation unit 241 performs the creation of a median plane image.
- the photographing section determination unit 240 displays the median plane image and receives an input from the operator. The operator sets a photographing section on the median plane image calculated by the recommended photographing section calculation unit 241.
- the acquired scout image (coronal image, axial image, sagittal image) may be displayed on the display device 111 together with the calculated median plane image.
- the operability when the operator manually sets the imaging section is improved.
- the head is set to be inclined, it is possible to confirm a median plane image acquired over a plurality of sheets with a single image, which facilitates positioning work.
- the case where the recommended imaging section calculation information storage unit 330 holds the imaging section list in advance is described as an example, but the present invention is not limited thereto.
- the operator may have a function of adding a new photographing section list item. For example, the operator sets an imaging section on an image in which the position of the anatomical feature structure serving as a mark is known via the display device 111 and the input device 116. Then, the relationship is registered in the photographing section list with an arbitrary name. At the time of setting, a scout image taken in the past, a scout image taken of the current patient, a standard human scout image, or the like is used. Regardless of which image is used, the anatomical feature structure is extracted manually or automatically by image processing.
- the interface to be used may be configured to have a dedicated interface, or may be configured to use an interface for determining an imaging section.
- a function for saving the input information in the imaging section list is added.
- the imaging section list may be configured to be registered by the operator for each inspection.
- the shooting cross section is displayed along the axis cut based on the set parameters (number of slices, slice thickness, FOV, etc.).
- a scout image whose position of the anatomical feature structure is known is displayed together.
- the image may be a scout image acquired by past photography or the like, or a standard human scout image.
- the operator manually sets an imaging section using the anatomical feature structure of the images displayed together as a mark.
- the computer 110 sets the manually set position as the imaging section of the main imaging, and stores the positional relationship with the position of the anatomical feature structure that is automatically recognized.
- the operator since the operator can set the photographing cross-sectional position as in a conventional inspection sense, the operator does not feel complicated preparations. Also, no special user interface is required. Furthermore, it is possible to change the protocol including the setting of the photographing cross-sectional position during the inspection process.
- the MRI apparatus of this embodiment basically has the same configuration as that of the first embodiment.
- the adjustment amount received from the operator after displaying the recommended photographing section or the recommended scout photographing section is stored as learning data, and has a function of reflecting it in subsequent processing.
- a description will be given focusing on the configuration different from the first embodiment.
- FIG. 14 is a functional block diagram of an information processing apparatus including the computer 110A and the storage device 112A according to this embodiment.
- the information processing apparatus of the present embodiment includes the learning section determination unit 240 of the control unit 200A and the learning function unit 244, and the storage unit 300B includes the learning data storage unit 340, respectively.
- a recommended photographing section calculation unit 241A is provided instead of the recommended photographing section calculation unit 241.
- the computer 110A includes a CPU and a memory, and each function of the control unit 200A realized by the computer 110A is executed by the CPU loading a program stored in the storage device 112A into the memory and executing the program.
- the storage unit 300A is implemented on the storage device 112A. All or a part of each function may be realized by a general-purpose information processing apparatus provided independently of the MRI apparatus 100 and capable of transmitting / receiving data to / from the MRI apparatus 100. Similarly, all or a part of the storage unit 300A may be realized by an external storage device that is provided independently of the MRI apparatus 100 and capable of transmitting and receiving data to and from the MRI apparatus 100.
- step S1225 and S1243 the learning function unit 244 extracts the adjustment amount added by the operator to the recommended imaging section and the recommended scout imaging section calculated by the recommended imaging section calculation unit 241A, and learns the learning data storage unit 340. Retain as data. At this time, learning data is registered in association with the part to be imaged.
- Learning data registered in the learning data storage unit 240 is an adjustment amount of an angle and a position added to the recommended photographing section by the operator.
- the learning function unit 244 collects the adjustment amount every time adjustment is performed, and updates the learning data registered in the learning data storage unit 340 in association with the imaging target region.
- the learning data is clustered based on the subject's age, gender, size of the examination site, setting direction, anatomical features, etc., and the average value of the adjustment values is calculated and registered in the same cluster. May be. By configuring in this way, for example, a correction value corresponding to individual differences can be obtained as learning data.
- the recommended photographing section calculation unit 241A uses the registered learning data as a correction value for the next calculation. That is, in the examination preparation process, after calculating the recommended imaging section and the recommended scout imaging section in step S1223 and step S1241, respectively, referring to the learning data storage unit 340, when learning data is registered for the imaging target region, The calculation result is corrected using the learning data, and the corrected cross-sections are set as a recommended shooting cross-section and a recommended scout shooting cross-section, respectively.
- a recommended photographing section can be obtained with higher accuracy. For example, when the set imaging section is different for each facility and for each operator, it is possible to automatically output the corresponding imaging section.
- the learning function unit 244 performs the above process only when the operator has selected to learn the adjustment. Furthermore, it may be configured such that the operator can select whether or not the learning data is reflected on the recommended photographing section and the recommended scout photographing section.
- the recommended photographing section calculation unit 241 performs the above process only when the operator selects to reflect the learning data. The selection may be made at every measurement, every photographing, and every examination.
- the final template model shape, the initial placement of the template model, the target subject, etc. are learned You may comprise so that it may preserve
- the application of the learning function can be adapted to the operator's preference.
- the learning function unit 244 can be used to set a recommended photographing section position. As described in the first embodiment, the changes made by the operator with respect to the imaging section displayed with the axis cut as an initial setting are stored and reflected in the next processing. In this case, there is an advantage that the operator does not need to set the recommended photographing section position in advance.
- the MRI apparatus of this embodiment basically has the same configuration as that of any of the above embodiments.
- the recommended photographing section calculation unit of the first embodiment and the second embodiment is used for the MPR process.
- the present embodiment will be described with a focus on a configuration different from any of the above embodiments.
- FIG. 15 is a functional block diagram of an information processing apparatus including the computer 110B and the storage device 112B according to this embodiment.
- the information processing apparatus of this embodiment is basically the same as any of the information processing apparatuses of each of the above embodiments, but in addition to the configuration of the information processing apparatus of each of the above embodiments, the control unit 200B includes an MPR processing unit 260. Is provided. Note that the learning function unit 244 and the learning data 340 may not be provided.
- the MPR processing unit 260 generates an MPR processing interface screen (MPRIF screen) and causes the display device 111 to display the interface screen via the UI control unit 210.
- MPRIF screen includes a display area for photographed three-dimensional data and a designation reception area for receiving input from the operator.
- the operator specifies information specifying the section to be diagnosed (cut section) and parameters (section parameters) for specifying the section to be cut such as FOV, number of slices, slice thickness, and slice interval. Accept.
- the information for specifying the cut-out cross section is, for example, information on a plane parallel to the OM line and a plane parallel to the AP-AC line in the case of the head.
- the section parameter may be specified by any method, for example, selecting from a list or setting manually by an operator on an image displayed in the display area. For methods that select from a list, there may be visual support through a graphical interface. Moreover, you may comprise so that it may have an interface which displays a cut-out cut section in the past, and only receives the presence or absence of consent. In this case, only when an intention to disagree is accepted, the screen shifts to a screen for accepting the designation of the cross-sectional parameter. By adopting this configuration, the same cross section as the cut cross section set in the past can be easily specified.
- the MPR processing unit 260 When the MPR processing unit 260 receives an instruction to start the MPR process from the operator, the MPR processing unit 260 first creates an image of at least two planes intersecting each other from the three-dimensional data. For example, in the case of the head, an image parallel to the coronal plane, an image parallel to the axial plane, and an image parallel to the sagittal plane are created.
- the recommended photographing section calculation unit 241 performs the same processing on each created image in the same procedure as each of the above-described embodiments, and calculates a cut section as a recommended photographing section. Then, the MPR processing unit 260 generates an image of the calculated cut section from the three-dimensional data, and the UI control unit 210 displays the generated image on the display device.
- an error message is displayed when the position of the median plane is determined to be an anatomically invalid position.
- an orthogonal triaxial section is displayed without calculating the cut section, and the operator manually sets the cut section.
- information such as the processing algorithm, the type of image processing, and the positional relationship between the cut-out section and the anatomical feature structure is stored in the recommended photographing section calculation information storage unit 330 in advance.
- the MPR processing unit 260 is configured to perform the image of each cross section in the same order as the scout imaging stored in the optimum scout imaging information storage unit 320, and when the necessary image generation is completed, the recommended imaging cross section is completed.
- the calculation unit 241 may be configured to perform the recommended photographing cross-section creation process in parallel with the image generation process by the MPR processing unit 260.
- a desired diagnostic image can be easily generated from three-dimensional data in a short time.
- the same two-dimensional scout photographing as in the case of setting manually is performed simultaneously with image processing, and a recommended photographing section is calculated and presented. Therefore, it is possible to improve the operability of positioning of the photographing section without changing the flow of the conventional inspection and without causing an increase in time by the recommended photographing section calculation process. Furthermore, the process of calculating the recommended photographing section can be applied to the process of automatically calculating the cut section in the MPR, and the inspection efficiency in the post-processing is improved.
- the present invention is applied to an MRI apparatus is described as an example, but the apparatus is not limited to this.
- the recommended imaging section calculation unit according to each of the above embodiments can be used to calculate various imaging sections and medical imaging apparatuses that can set an arbitrary plane in a three-dimensional space as an imaging section.
- DESCRIPTION OF SYMBOLS 100 MRI apparatus, 101: Magnet, 102: Gradient magnetic field coil, 103: Subject (living body), 104: Sequencer, 105: Gradient magnetic field power supply, 106: High frequency magnetic field generator, 107: RF coil, 108: RF probe, 109: receiver, 110: computer, 111: display device, 112: storage device, 113: shim coil, 114: shim power source, 115: bed (table), 116: input device, 200: control unit, 200A: control unit, 200B: control unit, 210: UI control unit, 220: signal processing unit, 230: measurement control unit, 240: imaging section determination unit, 241: recommended imaging section calculation unit, 241A: recommended imaging section calculation unit, 242: anatomy Characteristic feature extraction unit, 243: slice plane determination unit, 244: learning function unit, 260: MPR processing unit, 300: storage unit, 300A Storage unit, 301: coronal image, 302: axial image, 303:
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Abstract
Description
以下、本発明を適用する第一の実施形態について説明する。本発明の実施形態を説明するための全図において、同一機能を有するものは同一符号を付し、その繰り返しの説明は省略する。
XP=X0-(Xmin-X0)×Cosα
YP=Y0-(Xmin-X0)×Sinα (1)
点P611を通り、傾きが角度α610である直線を、アキシャル画像における正中線612とする。
-3√λi<bi<3√λi (3)
このように、bの値に制限を設けることにより、標準モデル820を変形させてテンプレートモデル800を作成する際、初期形状から大きく逸脱することを防止できる。また、固有値が大きい固有ベクトルほど個体差が大きい傾向を示すため、固有値の大きな固有ベクトルのみ標準モデル820に組み込むよう構成しても良い。このように構成することにより、計算時間を短縮できる。
次に、本発明を適用する第二の実施形態について説明する。本実施形態のMRI装置は基本的に第一の実施形態と同様の構成を有する。ただし、本実施形態では、推奨撮影断面または推奨スカウト撮影断面を表示させた後に操作者から受け付けた調整量を学習データとして記憶し、その後の処理に反映する機能を有する。以下、第一の実施形態と異なる構成に主眼をおいて説明する。
次に、本発明を適用する第三の実施形態を説明する。本実施形態のMRI装置は、基本的に上記各実施形態のいずれかと同様の構成を有する。ただし、本実施形態では、第一の実施形態および第二の実施形態の推奨撮影断面算出部をMPR処理に用いる。以下、上記各実施形態のいずれかと異なる構成に主眼をおいて、本実施形態を説明する。
Claims (15)
- 3次元空間の任意の面を撮影可能な医用画像撮影装置であって、
互いに交差する2つのスライス面の内の一方のスライス面である第一のスライス面に平行な1枚以上の二次元画像からなる第一の画像群と、他方のスライス面である第二のスライス面に平行な1枚以上の二次元画像からなる第二の画像群とを取得する画像取得手段と、
二次元画像から、予め定められた解剖学的特徴構造の情報を抽出する解剖学的特徴構造抽出手段と、
撮影断面として推奨する推奨撮影断面を算出する推奨撮影断面算出手段と、
撮影対象部位に応じて、前記推奨撮影断面を算出するために必要な推奨撮影断面算出情報を保持する推奨撮影断面算出情報記憶手段と、を備え、
前記解剖学的特徴構造抽出手段は、前記第一の画像群から第一の解剖学的特徴構造の情報を抽出するとともに、前記第二の画像群から第二の解剖学的特徴構造の情報を抽出し、
前記推奨撮影断面算出手段は、前記推奨撮影断面算出情報に従い、前記第一の解剖学的特徴構造の情報および前記第二の解剖学的特徴構造の情報を用いて前記推奨撮影断面を算出すること
を特徴とする医用画像撮影装置。 - 請求項1記載の医用画像撮影装置であって、
前記推奨撮影断面算出手段は、
スライス面を決定するスライス面決定手段と、
再構成画像から前記スライス面決定手段が決定したスライス面の二次元画像を生成する画像生成手段と、
画像上の解剖学的な特徴点の位置を特定する特徴点決定手段と、をさらに備え、
前記スライス面決定手段は、前記第一の解剖学的特徴構造および前記第二の解剖学的特徴構造を用い、前記推奨撮影断面算出情報に従って第三のスライス面を決定し、
前記画像取得手段は、前記第一のスライス面および前記第二のスライス面の双方に交差する第四のスライス面に平行な1枚以上の二次元画像からなる第四の画像群をさらに取得し、
前記画像生成手段は、前記第四の画像群から、前記第三のスライス面の二次元画像を第三の画像として生成し、
前記特徴点決定手段は、前記推奨撮影断面算出情報に従い、前記第三の画像上で前記推奨撮影断面が含むべき複数の解剖学的な特徴点の位置を特定し、
前記推奨撮影断面算出手段は、第三のスライス面に交差し、前記複数の解剖学的特徴点を含む面を前記推奨撮影断面とすること
を特徴とする医用画像撮影装置。 - 請求項1記載の医用画像撮影装置であって
前記推奨撮影断面算出手段は、スライス面を決定するスライス面決定手段をさらに備え、
前記スライス面決定手段は、前記第一の解剖学的特徴構造および前記第二の解剖学的特徴構造を用い、前記推奨撮影断面算出情報に従って第三のスライス面を決定し、
前記推奨撮影断面算出手段は、前記第三のスライス面を前記推奨撮影断面とすること
を特徴とする医用画像撮影装置。 - 請求項3記載の医用画像撮影装置であって、
前記推奨撮影断面算出手段は、再構成画像から前記スライス面決定手段が決定したスライス面の二次元画像を生成する画像生成手段をさらに備え、
前記画像取得手段は、前記第一のスライス面および前記第二のスライス面の双方に交差する第四のスライス面に平行な1枚以上の二次元画像からなる第四の画像群をさらに取得し、
前記画像生成手段は、前記第四の画像群から、前記第三のスライス面の二次元画像を第三の画像として生成し、
前記解剖学的特徴構造抽出手段は、前記推奨撮影断面算出情報に従い、前記第三の画像から第三の解剖学的特徴構造の情報を抽出し、
前記スライス面決定手段は、前記第一の解剖学的特徴構造の情報および前記第二の解剖学的特徴構造の情報のいずれか一方と、前記第三の解剖学的特徴構造の情報とを用い、前記推奨撮影断面算出情報に従って、第五のスライス面を決定し、
前記推奨撮影断面算出手段は、前記第五のスライス面を第二の前記推奨撮影断面とすること
を特徴とする医用画像撮影装置。 - 請求項3記載の医用画像撮影装置であって、
前記推奨撮影断面算出手段は、再構成画像から前記スライス面決定手段が決定したスライス面の二次元画像を生成する画像生成手段をさらに備え、
前記画像取得手段は、前記第一のスライス面および前記第二のスライス面の双方に交差する第四のスライス面に平行な1枚以上の二次元画像からなる第四の画像群をさらに取得し、
前記画像生成手段は、前記第四の画像群から、前記第三のスライス面の二次元画像を第三の画像として生成し、
前記解剖学的特徴構造抽出手段は、前記推奨撮影断面算出情報に従い、前記第三の画像から第三の解剖学的特徴構造の情報を抽出するとともに、前記第一の画像群から第四の解剖学的特徴構造の情報を抽出し、
前記スライス面決定手段は、前記第三の解剖学的特徴構造の情報および前記第四の解剖学的特徴構造の情報を用い、前記推奨撮影断面算出情報に従って、第五のスライス面を決定し、
前記推奨撮影断面算出手段は、前記第五のスライス面を第二の前記推奨撮影断面とすること
を特徴とする医用画像撮影装置。 - 請求項5記載の医用画像撮影装置であって、
前記画像生成手段は、前記第二の画像群から前記第五のスライス面の二次元画像を第五の画像として生成し、
前記解剖学的特徴構造抽出手段は、前記推奨撮影断面算出情報に従い、前記第五の画像から第五の解剖学的特徴構造の情報を抽出するとともに、前記第三の画像から第六の解剖学的特徴構造の情報を抽出し、
前記スライス面決定手段は、前記第五の解剖学的特徴構造の情報および前記第六の解剖学的特徴構造の情報を用い、前記推奨撮影断面算出情報に従って、第六のスライス面を決定し、
前記推奨撮影断面算出手段は、前記第六のスライス面を第三の前記推奨撮影断面とすること
を特徴とする医用画像撮影装置。 - 請求項1記載の医用画像撮影装置であって、
前記推奨撮影断面算出情報記憶手段は、前記解剖学的特徴構造の情報の抽出に用いる画像認識処理の種別を記憶し、
前記解剖学的特徴構造抽出手段は、前記推奨撮影断面算出情報記憶手段に記憶される画像認識処理により、前記解剖学的特徴構造の情報を抽出すること
を特徴とする医用画像撮影装置。 - 請求項2記載の医用画像撮影装置であって、
前記推奨撮影断面算出情報記憶手段は、前記撮影断面が含むべき複数の解剖学的な特徴点に対応する複数の座標点で構成されるテンプレートモデルを記憶し、
前記特徴点決定手段は、前記第三の画像上で、前記テンプレートモデルをフィッティングすることにより、前記複数の解剖学的特徴点の位置を特定すること
を特徴とする医用画像撮影装置。 - 請求項1記載の医用画像撮影装置であって、
前記推奨撮影断面算出手段が算出した前記推奨撮影断面を表示する表示手段と、
前記表示手段に表示された推奨撮影断面を変更するための補正量の入力を受け付ける入力手段と、
前記入力手段を介して補正量を受け付けた場合、前記推奨撮影断面を、前記受け付けた補正量で補正し、補正後の断面を撮影断面と決定する撮影断面決定手段と、をさらに備えること
を特徴とする医用画像撮影装置。 - 請求項9記載の医用画像撮影装置であって、
撮影対象部位に対応付けて前記入力手段を介して受け付けた補正量を記憶する補正量記憶手段をさらに備え、
前記推奨撮影断面算出手段は、
前記補正量記憶手段に撮影を行う対象の撮影部位に対応付けて前記補正量が記憶されている場合、前記表示手段に表示する前に、前記算出した推奨撮影断面を前記補正量で補正すること
を特徴とする医用画像撮影装置。 - 請求項1記載の医用画像撮影装置であって、
予め定められたシーケンスに従って、前記画像取得手段による前記二次元画像の取得を制御するスカウト撮影制御手段をさらに備え、
前記スカウト撮影制御手段は、前記第一の画像群の取得後に前記第二の画像群を取得し、
前記解剖学的特徴構造抽出手段は、前記第一の解剖学的特徴構造の情報の抽出を、前記第二の画像群の取得の前に終えること
を特徴とする医用画像撮影装置。 - 請求項1記載の医用画像撮影装置であって、
予め定められたシーケンスに従って、前記画像取得手段による前記二次元画像の取得を制御するスカウト撮影制御手段をさらに備え、
前記スカウト撮影制御手段は、前記第一の画像群の取得後に前記第二の画像群を取得し、
前記解剖学的特徴構造抽出手段は、前記第一の解剖学的特徴構造の情報の抽出を、前記第二の画像群を取得するシーケンスの開始前に終え、
前記スカウト撮影制御手段は、前記第一の解剖学的特徴構造の情報に基づき、第二の画像群を取得する位置を調整すること
を特徴とする医用画像撮影装置。 - 請求項3項記載の医用画像撮影装置であって、
予め定められたシーケンスに従って、前記画像取得手段による前記二次元画像の取得を制御するスカウト撮影制御手段と、
前記推奨撮影断面算出手段が算出した推奨撮影断面から撮影断面を決定する撮影断面決定手段と、
前記撮影断面決定手段が決定した撮影断面の診断用画像を取得する本撮影を行う本撮影制御手段と、をさらに備え、
前記解剖学的特徴構造抽出手段は、前記推奨撮影断面算出情報に従い、前記診断用画像から第三の解剖学的特徴構造の情報を抽出し、
前記スライス面決定手段は、前記第一の解剖学的特徴構造の情報および前記第二の解剖学的特徴構造の情報のいずれか一方と、前記第三の解剖学的特徴構造の情報とを用い、前記推奨撮影断面算出情報に従って、第五のスライス面を決定し、
前記推奨撮影断面算出手段は、前記第五のスライス面を第二の前記推奨撮影断面と決定すること
を特徴とする医用画像撮影装置。 - 請求項11記載の医用画像撮影装置であって、
撮影対象部位に対応づけて、前記第一のスライス面、前記第二のスライス面をそれぞれ特定する情報を保持するスカウト撮影情報保持手段をさらに備え、
前記スカウト撮影制御手段は、撮影対象部位に応じて前記スカウト撮影情報保持手段に保持されている情報に従って、前記画像取得手段を制御すること
を特徴とする医用画像撮影装置。 - 請求項11記載の医用画像撮影装置であって、
前記撮影断面決定手段が決定した撮影断面の適否を判別する適否判別手段と、
前記適否判別手段で否と判別された場合、前記推奨撮影断面に基づき、前記画像取得手段が二次元画像を取得するスライス面を決定し、当該画像取得手段に当該スライス面の画像を取得させる再スカウト撮影指示手段と、をさらに備えること
を特徴とする医用画像撮影装置。
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