WO2013094205A1 - 超音波診断装置および輪郭抽出方法 - Google Patents
超音波診断装置および輪郭抽出方法 Download PDFInfo
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- WO2013094205A1 WO2013094205A1 PCT/JP2012/008146 JP2012008146W WO2013094205A1 WO 2013094205 A1 WO2013094205 A1 WO 2013094205A1 JP 2012008146 W JP2012008146 W JP 2012008146W WO 2013094205 A1 WO2013094205 A1 WO 2013094205A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/52—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/5215—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves involving processing of medical diagnostic data
- A61B8/5223—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves involving processing of medical diagnostic data for extracting a diagnostic or physiological parameter from medical diagnostic data
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/08—Detecting organic movements or changes, e.g. tumours, cysts, swellings
- A61B8/0858—Detecting organic movements or changes, e.g. tumours, cysts, swellings involving measuring tissue layers, e.g. skin, interfaces
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/08—Detecting organic movements or changes, e.g. tumours, cysts, swellings
- A61B8/0883—Detecting organic movements or changes, e.g. tumours, cysts, swellings for diagnosis of the heart
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/08—Detecting organic movements or changes, e.g. tumours, cysts, swellings
- A61B8/0891—Detecting organic movements or changes, e.g. tumours, cysts, swellings for diagnosis of blood vessels
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/13—Tomography
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/46—Ultrasonic, sonic or infrasonic diagnostic devices with special arrangements for interfacing with the operator or the patient
- A61B8/461—Displaying means of special interest
- A61B8/463—Displaying means of special interest characterised by displaying multiple images or images and diagnostic data on one display
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/46—Ultrasonic, sonic or infrasonic diagnostic devices with special arrangements for interfacing with the operator or the patient
- A61B8/461—Displaying means of special interest
- A61B8/466—Displaying means of special interest adapted to display 3D data
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/46—Ultrasonic, sonic or infrasonic diagnostic devices with special arrangements for interfacing with the operator or the patient
- A61B8/467—Ultrasonic, sonic or infrasonic diagnostic devices with special arrangements for interfacing with the operator or the patient characterised by special input means
- A61B8/469—Ultrasonic, sonic or infrasonic diagnostic devices with special arrangements for interfacing with the operator or the patient characterised by special input means for selection of a region of interest
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/48—Diagnostic techniques
- A61B8/483—Diagnostic techniques involving the acquisition of a 3D volume of data
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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
- G16H50/00—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics
- G16H50/30—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics for calculating health indices; for individual health risk assessment
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/46—Ultrasonic, sonic or infrasonic diagnostic devices with special arrangements for interfacing with the operator or the patient
- A61B8/467—Ultrasonic, sonic or infrasonic diagnostic devices with special arrangements for interfacing with the operator or the patient characterised by special input means
Definitions
- the present invention relates to an ultrasonic diagnostic apparatus and a contour extraction method.
- Patent Document 1 a technique has been disclosed in which a blood vessel contour is extracted based on a diagnostic image of a subject, and a user corrects the extracted contour.
- the present invention provides an ultrasonic diagnostic apparatus that more accurately extracts organ contours from a plurality of diagnostic images in a short time.
- An ultrasonic diagnostic apparatus includes an outline extraction unit that extracts an outline of an organ from an image of an organ included in each of a plurality of ultrasonic images acquired from spatially continuous positions; Among the contours extracted by the contour extraction unit, manual correction target images including the contours to be manually corrected by the user from the plurality of ultrasonic images, and specification information for the manual correction The correction information indicating the content is specified from the user, and the contour extracted by the contour extraction unit is corrected with respect to the manual correction target image specified by the specification information received by the specification unit.
- a contour correction unit that performs correction based on the information, and the contour extraction unit is further configured based on information indicating the contour included in the manual correction target image after correction by the contour correction unit. Serial extracting a plurality of said manual correction target image and the new contour contained in the target image is a different image of the ultrasound image.
- the ultrasonic diagnostic apparatus of the present invention can extract an organ contour more accurately from a plurality of diagnostic images in a short time.
- FIG. 1 is a block diagram of the configuration of the ultrasonic diagnostic apparatus according to the first embodiment.
- FIG. 2 is a flowchart of the operation of the ultrasonic diagnostic apparatus according to the first embodiment.
- FIG. 3 is a flowchart of the process in step S105.
- FIG. 4 is a flowchart of processing for both boundaries of the intima and adventitia.
- FIG. 5A is a first flowchart showing a method of generating correction initial information editInf at the time of automatic correction of the intima and outer membrane.
- FIG. 5B is a second flowchart illustrating a method of generating the correction initial information editInf at the time of automatic correction of the inner membrane and the outer membrane.
- FIG. 6 is a diagram illustrating an example of manual correction.
- FIG. 1 is a block diagram of the configuration of the ultrasonic diagnostic apparatus according to the first embodiment.
- FIG. 2 is a flowchart of the operation of the ultrasonic diagnostic apparatus according to the first embodiment.
- FIG. 7A is a first explanatory diagram illustrating an example of an intima automatic correction process.
- FIG. 7B is a second explanatory diagram illustrating an example of an intima automatic correction process.
- FIG. 8 is an explanatory diagram of the effect of the ultrasonic diagnostic apparatus according to the first embodiment.
- FIG. 9 is a block diagram of the configuration of the ultrasonic diagnostic apparatus according to the second embodiment.
- FIG. 10 is an explanatory diagram showing a series of flows until a three-dimensional image is generated and displayed.
- FIG. 11 is an explanatory diagram of a first application example of the ultrasonic diagnostic apparatus according to the second embodiment.
- FIG. 12 is an explanatory diagram of a second application example of the ultrasonic diagnostic apparatus according to the second embodiment.
- FIG. 13 is an explanatory diagram of a third application example of the ultrasonic diagnostic apparatus according to the second embodiment.
- FIG. 14 is an explanatory diagram of a situation assumed in the third embodiment.
- FIG. 15 is a block diagram of the configuration of the ultrasonic diagnostic apparatus according to the third embodiment.
- FIG. 16 is an explanatory diagram of correction information and designation information of the ultrasonic diagnostic apparatus according to the third embodiment.
- FIG. 17 is a flowchart of the merging process according to the third embodiment.
- FIG. 18 is an explanatory diagram of the merging process according to the third embodiment.
- FIG. 19 is an explanatory diagram of blood vessel extraction processing according to the third embodiment.
- FIG. 20 is an explanatory diagram of the structure of the vascular wall of the artery.
- FIG. 20 is an explanatory diagram of the structure of the vascular wall of the artery.
- FIG. 21 is an explanatory diagram of the thickening of the intima by the plaque.
- FIG. 22 is an explanatory diagram of a three-dimensional shape of a plaque.
- FIG. 23 is a block diagram illustrating a configuration of an ultrasonic diagnostic apparatus according to the assumed technology.
- FIG. 24 is a flowchart illustrating the operation of the ultrasonic diagnostic apparatus according to the assumed technology.
- FIG. 25 is an explanatory diagram of a problem of the ultrasonic diagnostic apparatus in the assumed technology.
- FIG. 26 is an explanatory diagram when the blood vessel image diagnosis method is implemented by a computer system using a program recorded on a recording medium such as a flexible disk.
- FIG. 27 shows an example of an ultrasonic diagnostic apparatus.
- X-ray diagnostic apparatuses X-ray diagnostic apparatuses, MR (magnetic resonance) diagnostic apparatuses, ultrasonic diagnostic apparatuses, etc. are widely used as biological image diagnostic apparatuses.
- the ultrasonic diagnostic apparatus has advantages such as non-invasiveness and real-time property, and is therefore widely used for diagnosis including screening.
- diagnostic sites of the ultrasonic diagnostic apparatus such as the heart, blood vessels, liver or breast.
- carotid artery diagnosis for the purpose of risk determination of arteriosclerosis has attracted attention in recent years.
- FIG. 20 (a) shows the structure of the arterial vascular wall.
- the blood vessel wall is composed of three layers, an intima, an intima and an adventitia. As the arteriosclerosis progresses, the intima and media are mainly thickened.
- the ultrasound diagnostic apparatus detects the intima boundary and the epicardial boundary shown in FIG. taking measurement.
- plaque treatment by medication or a method of surgically removing the plaque Treatment with is required. Therefore, it is important to accurately measure the thickness of the inner media.
- FIG. 21 shows a normal example in which the intima is not thickened
- FIG. 21 shows an example in which plaque is formed by the progress of the intima thickening.
- FIG. 22 is an explanatory diagram of the three-dimensional shape of the plaque.
- FIG. 22A shows a state where a blood vessel traveling in the z-axis direction is cut by a plane parallel to the traveling direction of the blood vessel, and a plaque is present in a blackened region.
- FIG. 22B shows a short-axis cross section of the plaque (cross section perpendicular to the running direction of the blood vessel).
- (C) of FIG. 22 shows the long-axis cross section (cross section parallel to the running direction of the blood vessel) of the plaque.
- FIG. 23 is a block diagram showing a configuration of an ultrasonic diagnostic apparatus in the assumed technology.
- FIG. 23 is a block diagram showing the configuration of an ultrasonic diagnostic apparatus 2300 that measures the thickness of the intima in the carotid artery.
- the ultrasonic diagnostic apparatus 2300 includes a contour extraction unit 2301, a specification unit 2302, a manual correction unit 2303, a corrected contour memory 2304, and a display unit 2305.
- the ultrasonic diagnostic apparatus 2300 has a function of automatically extracting a blood vessel contour from a plurality of ultrasonic images obtained by scanning a blood vessel with an ultrasonic probe, and a user manually correcting the extracted blood vessel contour. Is provided.
- the contour extraction unit 2301 extracts a blood vessel contour from a plurality of spatially continuous ultrasound images, and inputs the contour extraction result to the display unit 2305.
- the display unit 2305 displays the automatically extracted blood vessel outline superimposed on the ultrasonic image. The user confirms whether correction of the automatically extracted blood vessel contour is necessary or not by checking the output of the display unit 2305. If the user determines that correction is necessary, the designation unit 2302 designates the ultrasound image to be corrected. To do. The display unit 2305 displays the blood vessel contour corrected by the manual correction unit 2303.
- the manual correction unit 2303 corrects the blood vessel contour of the ultrasonic image specified by the specifying unit 2302 based on the user input, and stores the correction result in the corrected contour memory 2304.
- FIG. 24 is a flowchart showing the operation of the ultrasonic diagnostic apparatus 2300.
- step S2401 the contour extraction unit 2301 automatically extracts a blood vessel contour from the ultrasound image.
- step S2402 the designation unit 2302 selects an ultrasound image for manually correcting the contour based on the result of the user referring to the automatically extracted blood vessel contour.
- step S2403 the manual correction unit 2303 corrects the blood vessel contour of the ultrasonic image selected by the designation unit 2302 based on the user input.
- the processes in step S2302 and step S2303 are repeated until correction for all ultrasonic images that require manual correction is completed.
- the ultrasonic diagnostic apparatus 2300 needs to perform manual correction (contour correction based on input to the user) for all frames (pointing to individual ultrasonic images) that require correction of the blood vessel contour.
- the contour of the blood vessel often changes continuously between spatially adjacent frames, so when performing contour extraction automatically, if contour extraction fails in a certain frame, it may also fail in the adjacent frame High nature.
- manual correction is required for many frames, and there is a problem that it takes a long time for correction.
- FIG. 25 is an explanatory diagram of a problem in the ultrasonic diagnostic apparatus 2300.
- FIG. 25A shows a frame in which it is determined that the blood vessel contour needs to be corrected, and a plurality of spatially continuous frames are selected. For all these frames, the doctor or engineer (user) who performs the diagnosis repeatedly performs the manual correction process shown in FIG. 25B, which causes a problem that the burden on the doctor and the like is heavy.
- the present invention provides an ultrasonic diagnostic apparatus that more accurately extracts organ contours from a plurality of diagnostic images in a short time.
- an ultrasonic diagnostic apparatus provides an outline of an organ from an image of an organ included in each of a plurality of ultrasonic images acquired from spatially continuous positions.
- a manual correction target image including the contour which is a target to be manually corrected by the user among the contours extracted by the contour extraction unit, from the plurality of ultrasonic images.
- a contour correction unit that corrects the contour extracted by the unit based on the correction information, and the contour extraction unit is further included in the manual correction target image after correction by the contour correction unit. Extracting said manual correction target image and the new contour included in the target image are different images of the plurality of ultrasound images based on the information indicating the serial contour.
- the ultrasonic diagnostic apparatus based on the correction result of the ultrasonic image obtained by correcting (manual correction) the contour of the organ (organ contour) based on the user's designation among the plurality of ultrasonic images, It is possible to extract the organ contour in the ultrasonic image of As a result, it is possible to extract organ contours from other ultrasonic images reflecting the result of manual correction by the user.
- the user needs time and labor for performing manual correction on each of the plurality of ultrasonic images, and according to the present invention, the time and effort are reduced. Time is reduced. Therefore, the outline of the organ can be extracted more accurately from a plurality of diagnostic images in a short time.
- the contour extraction unit performs a search process using the information indicating the contour included in the manual correction target image corrected by the contour correction unit as an initial contour, and the contour obtained by the search process is obtained.
- the new outline may be extracted.
- the ultrasonic diagnostic apparatus uses the organ contour manually corrected by the user as the initial contour when extracting the organ contour in the other ultrasonic image, thereby obtaining a more accurate organ contour. Can be extracted.
- the contour extraction unit performs the search process on the target image that is an image adjacent to the manual correction target image among the plurality of ultrasonic images, and the contour obtained by the search process May be extracted as the new contour.
- organ contours by reflecting the result of manual correction on an image acquired from a position close to the image to be manually corrected.
- the organ contour included in the image acquired from a position close to the image of the manual correction target image often has a shape similar to the organ contour included in the manual correction target image. A more accurate organ outline can be extracted.
- the ultrasonic diagnostic apparatus corrects the organ contour of one frame when correcting the organ contour automatically extracted from a plurality of spatially continuous ultrasound images. Then, it can correct
- the contour extracting unit obtains the search processing when the contour shape obtained by the search processing changes more than a predetermined value with respect to the shape of the contour of the organ extracted from the image of the organ.
- the obtained contour may be extracted as the new contour.
- the extraction is performed when the organ contour changes by a predetermined amount or more with respect to the initially extracted organ contour.
- the extracted new organ contour is taken as the extraction result. If the organ contour does not change more than a predetermined value as a result of the extraction, the organ contour before the extraction is used as the extraction result.
- the newly extracted organ contour can be used as the extraction result only for an image in which the difference between the initially extracted organ contour and the newly extracted organ contour is large.
- the contour extraction unit may further include, as initial contour information, information indicating the new contour obtained by the search process on the target image, and is an image of the plurality of ultrasonic images, A search process for searching for the contour included in the new target image is performed on the manual correction target image and a new target image different from the target image, and the contour obtained by the search process is determined as the new target image. It may be extracted as a contour.
- the contour extraction unit performs the search process on the new target image that is an image adjacent to the target image among the plurality of ultrasonic images, and the contour obtained by the search process May be extracted as the new contour.
- the contour extraction unit performs the search process using the image as the new target image in order from an image close to the manual correction target image among the plurality of ultrasonic images, Information indicating the contour of the organ extracted by the immediately preceding search process may be performed as the initial contour.
- the contour extraction unit may perform search processing on the contour shape of the organ extracted from the organ image until the contour shape obtained by the search processing does not change more than a predetermined value. Good.
- organ contours can be extracted in order from an image closer to the image subjected to manual correction, and the extraction result can be sequentially applied to an image farther from the image subjected to manual correction.
- the contour extracting unit may extract the contour of the vascular membrane as the contour of the organ.
- the contour extracting unit may extract an intima or outer membrane contour of the vascular membrane as the organ contour.
- the ultrasonic diagnostic apparatus can correct the blood vessel contour, or the intima contour or the epicardial contour of the blood vessel.
- the contour extracting unit sequentially sets the images as the new target image in order from an image acquired from a position close to a position where the manual correction target image is acquired among the plurality of ultrasonic images.
- a search process may be performed, and the search process may be performed until the distance between the endocardial contour and the epicardial contour obtained by the search process is equal to or less than a threshold value.
- the ultrasonic diagnostic image further integrates the organ contour extracted by the contour extraction unit for each of the plurality of ultrasonic images based on the position where the ultrasonic image is acquired.
- a three-dimensional image generation unit that generates a three-dimensional image of the organ may be provided.
- a three-dimensional image of a blood vessel can be generated by combining the blood vessel contours corrected by the ultrasonic diagnostic apparatus.
- the user can grasp the outline of the organ more intuitively by looking at the three-dimensional shape of the blood vessel.
- the specifying unit receives additional contour information indicating the contour of the organ image included in the manual correction target image from the user as the correction information, and the contour correction unit is configured to receive the manual correction target image.
- the correction may be performed by forming the contour based on the correction information.
- the contour extraction unit forms one contour by integrating the plurality of overlapping contours, and the formed contour May be extracted as the new contour.
- the blood vessel contour can be formed by regarding those blood vessels as one blood vessel.
- the designation unit designates a first image that is an image including one image of the organ and a second image that is an image including two images of the organ as the manual correction target images.
- the additional contour information indicating the contours of the one organ image included in the first image and the contours of the two organ images included in the second image as the correction information.
- the outline correction unit may receive the correction by forming the outline based on the correction information in each of the first image and the second image.
- a Y-shaped blood vessel contour that has not been extracted by the ultrasonic diagnostic apparatus can be newly formed by the user's designation.
- the contour extraction method is a contour extraction method in an ultrasonic diagnostic apparatus, which is based on an organ image included in each of a plurality of ultrasonic images acquired from spatially continuous positions.
- a contour extracting step for extracting the contour of the organ; and a manual correction target image including the contour, which is a target for a user to manually correct the contour extracted in the contour extracting step, of the plurality of ultrasonic images.
- a designation step for accepting designation information for designation from the inside and correction information indicating the contents of the manual correction from the user, and the manual correction target image designated by the designation information received in the designation step.
- a contour correcting step for correcting the contour extracted in the contour extracting step based on the correction information Further, the image is included in a target image that is different from the manual correction target image among the plurality of ultrasonic images based on information indicating the contour included in the manual correction target image after being corrected in the contour correction step. A new contour is extracted.
- a recording medium recording medium such as a system, method, integrated circuit, computer program, or computer-readable CD-ROM, and the system, method, integrated circuit, You may implement
- the ultrasonic diagnostic apparatus 1 when correcting a blood vessel contour (blood vessel contour) automatically extracted from a spatially continuous ultrasonic image, manually corrects one frame, It has a feature that it automatically corrects by newly extracting blood vessel contours of a plurality of frames.
- a blood vessel is an example of an organ
- a blood vessel outline is an example of an organ outline.
- FIG. 1 is a block diagram showing a configuration of the ultrasonic diagnostic apparatus 1.
- the ultrasonic diagnostic apparatus 1 includes a contour extraction unit 101, a specification unit 102, a manual correction unit 103, a target setting unit 104, a correction information generation unit 105, a corrected contour memory 106, and a display unit. 107.
- the contour extraction unit 101 extracts a pre-correction contour preEdit of a blood vessel from a plurality of spatially continuous ultrasonic images.
- the contour extraction is performed by sequentially updating the contour from the set initial contour until reaching the intima boundary or epicardial boundary of the blood vessel.
- the initial contour indicates the rough position and shape of the blood vessel.
- the initial contour may be set based on blood flow information acquired by ultrasound, the contour extraction result of spatially adjacent frames, or may be set based on designation of a region in the blood vessel by the user. Good.
- the blood flow information color flow, power Doppler information, or pulse Doppler information acquired by an ultrasound imaging apparatus can be used. In general, the closer the initial contour is to the correct contour, the more accurate the contour is obtained as a result of the contour extraction.
- the contour extraction unit 101 sets an initial contour by regarding a region where the signal strength of power Doppler is equal to or greater than a threshold as a blood flow existing region, for example. Then, the contour extraction unit 101 searches the contour of the blood vessel from the initial contour set in this way by a dynamic contour method such as SNAKE or the level set method. Specifically, the contour extracting unit 101 searches for the intima contour or the epicardial contour of the blood vessel as the blood vessel contour. It is not always necessary to use the active contour method. For example, the contour extraction unit 101 may perform contour extraction by searching for an edge from the initial contour toward the inside or the outside. In this case, it is not necessary to repeatedly update the contour.
- the initial contour may be information indicating the position of the contour, for example, indicating one point in the contour.
- the display unit 107 displays the contour extracted by the contour extraction unit 101.
- the display unit 107 displays the contour extracted by superimposing the pre-correction contour preEdit on the ultrasonic image.
- the user confirms whether or not the blood vessel contour extracted by the contour extracting unit 101 is to be corrected by displaying on the display unit 107, and corrects the blood vessel contour extracted by the contour extracting unit 101 when the correction is necessary (manually) to correct.
- the function of each functional block at the time of performing manual correction will be described.
- the designation unit 102 receives designation information for designating a frame (manual correction target image) for manually correcting the blood vessel contour, and correction information indicating the content of correction for the frame from the user.
- the manual correction unit 103 corrects the blood vessel contour of the frame specified by the specification information received from the user by the specification unit 102 based on the correction information received from the user, and stores the correction result in the corrected contour memory 106. Further, the manual correction unit 103 inputs the manually corrected frame identification information to the target setting unit 104.
- the target setting unit 104 determines a frame (target image) on which contour correction (extraction of a new blood vessel contour) is performed in the vicinity of the manually corrected frame, and inputs the identification information idx to the correction information generation unit 105.
- the correction information generation unit 105 generates a corrected initial contour editInf, which is initial information used when correcting the contour of the frame corresponding to the identification information idx, and inputs the corrected initial contour editInf to the contour extraction unit 101.
- the contour extracting unit 101 extracts the blood vessel contour of the frame corresponding to the identification information idx based on the corrected initial contour editInf, and stores it in the corrected contour memory 106 as the corrected contour postEdit.
- the display unit 107 displays the corrected outline information with reference to the corrected outline memory 106.
- an initial contour close to the correct contour shape can be set. Therefore, the accuracy of contour extraction is improved, and as a result, a correct contour shape is obtained.
- FIG. 2 is a flowchart showing the operation of the ultrasonic diagnostic apparatus 1.
- step S101 the contour extracting unit 101 automatically extracts a blood vessel contour from a plurality of inputted ultrasonic images.
- the designation unit 102 refers to the blood vessel contour for each frame extracted by the contour extraction unit 101 in step S101, designation information for designating a frame (manual correction target image) for manually correcting the contour, Correction information for the frame is received from the user.
- step S103 the manual correction unit 103 manually corrects the contour based on the correction information received from the user.
- step S104 the blood vessel contour of the adjacent frame of the frame manually corrected in step S103 is automatically corrected.
- step S107 the blood vessel contour of the adjacent frame of the frame manually corrected in step S103 is automatically corrected.
- the target setting unit 104 determines an automatic correction target frame (target image) that is a frame for automatically correcting the blood vessel contour (extracting a new blood vessel contour).
- the target setting unit 104 determines the automatic correction target frames in order from, for example, a frame spatially close to the manual correction frame.
- the target setting unit 104 may determine the automatic correction target frame as one of a plurality of input ultrasonic images.
- the target setting unit 104 converts the automatic correction target frame into an ultrasonic image acquired from a position within a predetermined value within a predetermined value from the position where the manual correction frame is acquired among a plurality of input ultrasonic images. You may decide.
- step S105 the correction information generation unit 105 generates a corrected initial contour editInf corresponding to the automatic correction target frame based on the manual correction result or the already automatically corrected contour.
- step S106 the contour extracting unit 101 extracts the contour of the automatic correction target frame based on the corrected initial contour editInf, and calculates the contour shape after the automatic correction.
- the initial contour information is different, but other parameters may be different values.
- the amount of change in luminance in the vicinity of the contour is subjected to threshold processing, and the contour is detected in consideration of continuity with the peripheral contour.
- the luminance change amount in the vicinity of the contour is estimated based on the luminance distribution of the region, and the estimated value is contoured. Can be used for detection.
- the actual contour is a contour that correctly shows the contour of the blood vessel on the ultrasound image.
- step S107 the target setting unit 104 determines whether the amount of change in the contour shape before and after the automatic correction is equal to or less than a threshold value. In this determination, if the amount of change in the contour shape is less than or equal to the threshold value, the automatic correction is terminated. On the other hand, if the amount of change in the contour shape exceeds the threshold value in this determination, it is determined that automatic correction is necessary for the subsequent frame, and the process returns to step S104.
- the end determination in step S107 may be based on other conditions such as whether or not the number of automatic editing frames has reached a predetermined number. Note that an ultrasonic image extracted in advance may be used as an input.
- step S107 the processing in step S107 is not essential. That is, the determination in step S107 may not be performed simply. In this case, the ultrasonic diagnostic apparatus 1 extracts a new blood vessel contour from another ultrasonic image based on the manual correction result of the one manually corrected ultrasonic image. Further, instead of the determination in step S107, it may be determined whether or not a new blood vessel contour has been extracted from all of the acquired ultrasonic images. In this case, the ultrasonic diagnostic apparatus 1 extracts new blood vessel contours in all other ultrasonic images based on the manual correction result of one ultrasonic image that has been manually corrected.
- step S104 to step S107 is executed for each of the front and rear directions with respect to the traveling direction of the blood vessel, and the amount of change in the contour shape before and after automatic correction is a threshold value for each direction.
- the automatic correction for the subsequent frames is repeated until the following is satisfied.
- FIG. 3 is a flowchart of the process of step S105.
- step S1051 the correction information generation unit 105 determines whether the frame immediately before the automatic correction target frame is a manual correction frame. If it is determined that the frame immediately before the automatic correction target frame is a manual correction frame, the contour of the manual correction frame is set as the corrected initial contour editInf (step S1052). When it is determined that the frame immediately before the automatic correction target frame is not a manual correction frame, the automatic correction result of the contour of the immediately previous frame is set as the corrected initial contour editInf (step S1053).
- steps S1052 and S1053 instead of using the manual correction frame or the automatic correction result of the immediately preceding frame as it is, for example, the contour position is moved based on motion information between frames, or between frames based on pulsation The deformation of the blood vessel wall may be taken into consideration.
- manual correction may be performed on a plurality of frames.
- the automatic correction ranges from the respective manual correction frames may overlap.
- the 12th and 13th frames are included in the range of automatic correction of each frame. Includes eyes.
- the automatic correction result obtained from each manual correction frame is weighted according to the spatial distance from each manual correction frame, etc. May be.
- a frame near the center of the frame group may be selected. This is because the accuracy of automatic correction is higher in a frame closer to the manual correction frame.
- further accuracy improvement of automatic correction can be expected by manually correcting a plurality of frames.
- the extraction and correction of the blood vessel contour have been described without distinguishing between the intima of the blood vessel (hereinafter simply referred to as the intima) and the outer membrane of the blood vessel (hereinafter simply referred to as the intima).
- the intima the intima of the blood vessel
- the intima the outer membrane of the blood vessel
- FIG. 4 is a flowchart of processing for both boundaries between the inner membrane and the outer membrane.
- the contour extracting unit 101 extracts the contours of the intima and epicardium from the input ultrasonic image.
- the contour extracting unit 101 may perform contour extraction using different methods for the inner membrane and the outer membrane. For example, in the ultrasound image, the intima is often not clearly depicted, so the contour extraction unit 101 determines that the intima contour has been moved inward by a predetermined thickness with respect to the epicardial contour extraction result. And, the contour extraction unit 101 may determine the thickness of the intima from the manual correction result of the intima contour and the epicardial contour, and then propagate it so that the thickness of the intima gradually attenuates in the adjacent frame. Good.
- the contour extraction unit 101 can determine the thickness in the adjacent frame using a Gaussian function or the like.
- the thickness of the intima is set at a plurality of positions such as the outer membrane or the apex of the intima.
- the thickness of the inner media in adjacent manually corrected frames may be propagated, and weighting may be performed when both overlap.
- the ultrasound diagnostic apparatus 1 refers to the contour extraction result of the intima and epicardium, selects a manual correction target frame, and determines whether to correct each of the intima contour and the epicardial contour. decide.
- step S113 the ultrasonic diagnostic apparatus 1 manually corrects the contour of the intima or epicardium of the manual correction target frame according to the user's specification.
- step S114 the contour of the intima or epicardium is corrected from step S114 to step S117.
- This correction process is basically an extension of the same process as the flowchart of FIG. 2 for each of the intima and outer film, but the automatic correction end condition and the initial correction
- the method of generating information editInf is different. These differences will be described in detail.
- the ultrasonic diagnostic apparatus 1 determines the end of automatic correction.
- the ultrasonic diagnostic apparatus 1 calculates the corrected thickness of the intima from the contour determined to be corrected in step S112 of the intima and the outer membrane.
- the ultrasound diagnostic apparatus 1 determines whether or not the calculated thickness of the intima is less than or equal to a threshold value, and ends the automatic correction if the thickness of the intima is less than or equal to the threshold value. If the thickness exceeds the threshold, the process returns to step S114.
- the thickness the maximum value of the thickness in the entire circumference of the vascular membrane can be used.
- the thickness may be an index such as an average value or an intermediate value of the thickness of the entire circumference in a case where it is desired to see the degree of overall thickening of the inner media.
- the threshold value of the thickness of the intima is set based on a thickness that is medically determined to be a plaque or intima thickening. Note that when the end determination is made based on the thickness of the intima, it is desirable that both the intima and the outer membrane have been automatically corrected. Accordingly, when both the intima and the adventitia are automatically corrected at the time of the determination in step S117, the determination is made based on the thickness of the intima and only either the intima or the adventitia is automatically corrected. In such a case, the determination may be made by the method used in the end determination in step S107 of FIG.
- the contour of the entire plaque part can be corrected by manually correcting the frame included in the plaque part and automatically correcting the frames before and after that.
- the boundary of the intimal contour of the plaque site is unclear and difficult to detect, and thus the intimal contour is often not detected correctly. This method is effective because the contour of the entire plaque region can be corrected.
- the thickness of the intima is detected to be larger than the actual thickness. . In that case, the thickness may be reduced during correction.
- the method used in the end determination in step S107 of FIG. 2 may be used instead of the above-described end determination in step S117.
- FIGS. 5A and 5B are flowcharts showing a method of generating the correction initial information editInf at the time of automatic correction of the inner membrane and outer membrane in step S115.
- the two types of methods shown in FIGS. 5A and 5B will be described in order.
- step S1151 it is determined whether to automatically correct the intima. If it is determined to be corrected, the process proceeds to step S1152, and if it is determined not to be corrected, the process proceeds to step S1153.
- step S1152 based on the corrected intima outline shape, intima correction initial information editInf is generated.
- step S1153 it is determined whether to automatically correct the outer membrane. If it is determined to be corrected, the process proceeds to step S1154. If it is determined not to be corrected, the process is terminated.
- step S1154 corrected initial information editInf of the outer membrane is generated based on the corrected outer membrane contour shape.
- step S115a it is determined whether to automatically correct the intima. If it is determined to be corrected, the process proceeds to step S115b, and if it is determined not to be corrected, the process proceeds to step S115c.
- step S115b the intima correction initial information editInf is generated based on the corrected intima outline shape.
- step S115c it is determined whether to automatically correct the outer membrane. If it is determined to correct, the process proceeds to step S115d, and if it is determined not to be corrected, the process ends.
- step S115d it is determined whether or not it is determined to correct the intima in step S115a. If it is determined to be corrected, the process proceeds to step S115e, and if not, the process proceeds to step S115f.
- step S115e the initial correction information editInf of the outer membrane is generated based on the correction information of the inner membrane.
- the intima correction initial information editInf is used as the outer film correction initial information editInf.
- the automatic correction of the intimal contour may be terminated before the execution of step S115e, and the intimal contour after the automatic correction may be used as the corrected initial contour editInf of the epicardium.
- step S115f initial correction information editInf of the outer membrane is generated based on the corrected outer membrane contour shape.
- the inner membrane and the outer membrane may be interchanged.
- FIG. 6 is a diagram for explaining an example of manual correction.
- FIG. 6A shows the contour shape of the intima and outer membrane before correction.
- FIG. 6B shows a contour shape after three vertices from the vertex 1 to the vertex 3 of the intima are corrected by manual correction.
- correction information In manual correction, the user uses a user interface such as a touch pen, touch panel, or mouse cursor to move a plurality of vertices set on the contour, thereby forming a corrected contour shape.
- a user interface such as a touch pen, touch panel, or mouse cursor to move a plurality of vertices set on the contour, thereby forming a corrected contour shape.
- Information on the vertex indicating the formed contour shape, or the formed contour shape itself is called correction information.
- the corrected contour shape may be formed by the user tracing the contour freehand, instead of the user moving the vertex to correct the contour.
- FIG. 6 8 points each for the inner and outer membranes are shown as vertices to be used for correction.
- the contour shape may be generated by using a larger number of vertices than the vertexes to be used for correction.
- a contour shape may be generated using a number of vertices.
- the position of the non-correction vertex can be generated by interpolation from the correction vertices. For example, a total of 16 vertices can be obtained by interpolating and generating one non-correction vertex position from adjacent correction vertices, and a contour shape can be generated using these. Furthermore, the position of the non-correction vertex may be determined by generating an initial contour based on the position of the correction vertex after manual correction and executing the contour extraction process. At this time, the position of the correction vertex is not updated in the contour extraction process.
- FIG. 7A and FIG. 7B are explanatory diagrams showing an example of an intima automatic correction process.
- FIG. 7A is a diagram illustrating a state in which the adjacent frame is automatically corrected when the frame N is manually corrected.
- the blood vessel contours of four frames (N + 1, N + 2, N + 3, and N + 4) are automatically corrected for both directions before and after the frame N.
- FIG. 7B is a diagram showing contour shapes before and after correction in a frame that is automatically corrected.
- FIG. 7B shows the result of manual correction of the blood vessel contour in frame N.
- FIG. (B) in FIG. 7B and (c) in FIG. 7B show the contour shapes of the frame N + 1 before and after automatic correction, respectively.
- the intima contour of the frame N + 1 is extracted using the manual correction result of the intima contour of the frame N as an initial contour.
- (D) of FIG. 7B and (e) of FIG. 7B show the contour shapes of the frame N + 2 before and after automatic correction, respectively.
- the intima contour of the frame N + 2 is extracted using the result of automatic correction of the intima contour of the frame N + 1 as an initial contour. In this way, the contour of the subsequent frame is automatically corrected based on the contour shape that has already been manually corrected or automatically corrected.
- FIG. 8 is an explanatory diagram of the effect of the ultrasonic diagnostic apparatus 1 according to the present embodiment.
- FIG. 8A shows an example of selecting a target frame for manual correction
- FIG. 8B shows an example of manual correction of the selected frame
- FIG. 8C shows a state in which the adjacent frame of the manual correction frame is automatically corrected.
- the ultrasonic diagnostic apparatus corrects an organ outline (organ outline) among a plurality of ultrasonic images based on user designation (manual outline). Based on the correction result of the corrected ultrasonic image, an organ contour in another ultrasonic image can be extracted. As a result, it is possible to extract organ contours from other ultrasonic images reflecting the result of manual correction by the user.
- the user needs time and labor for performing manual correction on each of the plurality of ultrasonic images, and according to the present invention, the time and effort are reduced. Time is reduced. Therefore, the outline of the organ can be extracted more accurately from a plurality of diagnostic images in a short time.
- the ultrasound diagnostic apparatus uses the organ contour manually corrected by the user as an initial contour when extracting the organ contour in the other ultrasound image, thereby extracting a more accurate organ contour. Can do.
- organ contours by reflecting the result of manual correction on an image acquired from a position close to the image to be manually corrected.
- the organ contour included in the image acquired from a position close to the image of the manual correction target image often has a shape similar to the organ contour included in the manual correction target image. A more accurate organ outline can be extracted.
- a new extracted contour is obtained.
- the organ contour is extracted. If the organ contour does not change more than a predetermined value as a result of the extraction, the organ contour before the extraction is used as the extraction result.
- the newly extracted organ contour can be used as the extraction result only for an image in which the difference between the initially extracted organ contour and the newly extracted organ contour is large.
- the organ contour in another ultrasonic image can be extracted. Therefore, the outline of the organ can be extracted more accurately from a plurality of diagnostic images in a short time.
- organ contours can be extracted in order from an image closest to the image subjected to manual correction, and the extraction result can be sequentially applied to an image far from the image subjected to manual correction.
- the ultrasonic diagnostic apparatus can correct the blood vessel contour, or the intima contour or the epicardial contour of the blood vessel.
- the thickness of the vascular membrane obtained by the extraction is equal to or greater than the threshold value, that is, only the plaque portion, can be targeted for extraction of a new blood vessel contour.
- Embodiment 2 An ultrasonic diagnostic apparatus and method according to Embodiment 2 will be described with reference to the drawings.
- the ultrasonic diagnostic apparatus 2 of the present embodiment is different from the ultrasonic diagnostic apparatus 1 in that a three-dimensional image of a blood vessel is constructed and displayed based on a blood vessel contour before or after correction in each ultrasonic image.
- each function related to the construction of a three-dimensional image will be described. Since other functions are the same as those of the ultrasound diagnostic apparatus 1, the same reference numerals are given and description thereof is omitted.
- FIG. 9 is a block diagram showing a configuration of the ultrasonic diagnostic apparatus 2 according to the present embodiment.
- the ultrasound diagnostic apparatus 2 includes a contour extraction unit 101, a specification unit 102, a manual correction unit 103, a target setting unit 104, a correction information generation unit 105, a corrected contour memory 202, and a three-dimensional image generation.
- a unit 201 and a display unit 203 are provided.
- the three-dimensional image generation unit 201 generates a three-dimensional image 3dImg of the blood vessel based on the pre-correction contour preEdit and the position information locInf indicating the position and orientation of the pre-correction contour preEdit.
- the position information locInf is acquired in synchronization with the acquisition time of the ultrasonic image or at a time close to the acquisition time when acquiring the ultrasonic image.
- the position information locInf is measured by using a magnetic sensor, an acceleration sensor, a gyroscope, a camera, or the like for the position and orientation of an ultrasonic probe that acquires an ultrasonic image.
- the ultrasonic probe may be a 2D probe capable of acquiring a two-dimensional image or a 3D probe capable of acquiring a three-dimensional image.
- the ultrasonic probe may be an oscillating probe that continuously scans a two-dimensional ultrasonic image while oscillating the ultrasonic element in the probe among the 3D probes. It may be a matrix probe arranged in a dimension.
- final position information is determined in consideration of the position and orientation of the scan plane at the acquisition time of the ultrasonic image in addition to the position information of the probe itself.
- a three-dimensional image can be generated. For example, if an ultrasound image is scanned while moving the probe in one direction at a constant speed, the relative positional relationship between the ultrasound images becomes constant, so that a three-dimensional image can be generated although accuracy is reduced.
- a three-dimensional image may be generated so as to match the model.
- the carotid artery is generally Y-shaped, the blood vessel contour can be arranged so that the three-dimensional shape is Y-shaped. In these cases, the position information locInf is determined based on the conditions at the time of scanning or the shape model, not the information acquired from the external means.
- a 3D image may be regenerated based on the corrected contour postEdit. Further, the corrected contour postEdit may be temporarily stored in the corrected contour memory 202.
- the position information locInf is the same in the post-correction contour postEdit and the pre-correction contour preEdit.
- the display unit 203 displays the 3D image 3dImg generated by the 3D image generation unit 201.
- FIG. 10 is an explanatory diagram showing a series of flow from generation and display of a three-dimensional image 3dimg.
- A) of FIG. 10 is an inputted ultrasonic image, and the outline of the blood vessel is extracted from these ultrasonic images ((b) of FIG. 10).
- the blood vessel contour is arranged on the three-dimensional space based on the position information ((c) in FIG. 10), and the generated three-dimensional image is displayed ((d) in FIG. 10).
- FIG. 11 is an explanatory diagram showing a first application example of the ultrasonic diagnostic apparatus 2 according to the present embodiment.
- FIG. 11A shows a blood vessel contour editing screen.
- the ultrasound diagnostic apparatus 2 displays the result of automatic extraction of the intima and epicardial contours of the carotid artery on the ultrasound B-mode image 1101.
- the ultrasound diagnostic apparatus 2 may display an enlarged image 1102 of the ultrasound B-mode image 1101.
- FIG. 11B shows a display example of a three-dimensional image of the blood vessel contour.
- the example of FIG. 11B is an example in which the carotid artery is scanned, and a three-dimensional image of the Y-shaped carotid artery is displayed.
- a rectangular frame 1104 superimposed and displayed on the three-dimensional image is a virtual plane indicating the scan position of the ultrasonic image shown in FIG. That is, an ultrasonic image obtained by scanning the carotid artery at the position indicated by the virtual plane in FIG. 11B is displayed in FIG.
- the ultrasound image displayed on the left side of the screen may be switched by moving the virtual plane, or the ultrasound image may be switched using a slide bar 1103 or the like disposed below the ultrasound image.
- FIG. 12 is an explanatory diagram showing a second application example of the ultrasonic diagnostic apparatus 2 according to the present embodiment.
- FIG. 12 shows a site where the intima is thickened on an ultrasonic image or a three-dimensional image.
- (A) of FIG. 12 highlights the thickened portion of the intima in the ultrasound image.
- FIG. 12B highlights a thickened portion of the inner media in the three-dimensional image.
- FIG. 12B by highlighting a thickened portion of the intima in a three-dimensional image, the user can easily grasp the disease site. Further, it is possible to use the virtual plane by moving the virtual plane to the highlighted part in the three-dimensional image and observing the ultrasonic image at the destination position.
- FIG. 13 is an explanatory diagram showing a third application example of the ultrasonic diagnostic apparatus 2 according to the present embodiment.
- the whole image is shown as shown in FIG. 13 (a) when browsing an ultrasonic image, and at the time of correcting the blood vessel contour, (b) of FIG. ) Enlarge the blood vessel region as shown in FIG.
- the three-dimensional image is not only an image of the blood vessel contour as shown in FIG. 13C, but also a vertical division of the blood vessel contour in order to display the intima boundary and intima thickening in an easy-to-understand manner.
- An image or a cross-sectional image may be displayed.
- a general technique such as surface rendering or volume rendering can be applied to display a three-dimensional image.
- the visibility of the shape or status is improved by changing the display color of the contour between the intimal contour and the epicardial contour, or before and after the contour correction. May be. Further, it may be possible to set whether or not the user automatically corrects the contour.
- the positions of the contour vertices after manual editing and automatic editing may be stored separately, and when the same input ultrasonic image is diagnosed again, the contour reflecting the previous editing information may be displayed. Moreover, when observing the same region many times, such as observation of aging of plaque, the plaque shape at the previous observation may be displayed for comparison.
- the carotid artery is mainly described as a diagnostic site.
- the ultrasonic diagnostic apparatus and method of the present invention can be applied to other blood vessels.
- the present invention can also be applied to abdominal aorta, lower limb arteries, calcaneous arteries, subclavian arteries, etc., which are frequent sites of atherosclerosis.
- it can be applied to any tubular organ.
- the target input image is not limited to an ultrasonic image, and may be an image acquired by CT (Computed Tomography), MRI (Magnetic Resonance Imaging), or the like.
- CT Computer Tomography
- MRI Magnetic Resonance Imaging
- an ultrasonic image may be mapped to the three-dimensional shape of a blood vessel acquired in these modals to construct an ultrasonic three-dimensional image.
- the ultrasonic diagnostic apparatus As described above, according to the ultrasonic diagnostic apparatus according to the present embodiment, it is possible to generate a three-dimensional image of blood vessels by combining the blood vessel contours corrected by the ultrasonic diagnostic apparatus. The user can grasp the outline of the organ more intuitively by looking at the three-dimensional shape of the blood vessel.
- Embodiment 3 An ultrasonic diagnostic apparatus and method according to Embodiment 3 will be described with reference to the drawings.
- the ultrasonic diagnostic apparatus 3 of the present embodiment when there are a plurality of corrected blood vessel contours in each ultrasonic image and they overlap each other, the plurality of overlapping blood vessel contours are integrated into one blood vessel. It differs from the ultrasonic diagnostic apparatus 1 in that it has a contour.
- each function related to the integration of the blood vessel contour will be described. Since other functions are the same as those of the ultrasound diagnostic apparatus 1, the same reference numerals are given and description thereof is omitted.
- FIG. 14 is an explanatory diagram of a situation assumed in the third embodiment.
- FIG. 14A is a view showing a blood vessel having a branch (Y-shaped blood vessel) composed of a blood vessel 1, a blood vessel 2 and a blood vessel 3.
- a Y-shaped blood vessel is present in, for example, the human carotid artery.
- an ultrasonic image of the cross section 1401 acquired by the ultrasonic diagnostic apparatus is as shown in FIG.
- the cross section 1401 includes two blood vessels, the blood vessel 1 and the blood vessel 2, but when the contour of the blood vessel is acquired in the ultrasonic image of FIG. 14B, only the contour of one of the two blood vessels is detected. There is.
- the shape of the blood vessel is formed using the detected contour in this way, for example, as shown in FIG. 14C, the shape of the blood vessel 1 ahead from the branch point is lost.
- the ultrasonic diagnostic apparatus in the present embodiment it is possible to acquire a correct blood vessel shape including a blood vessel in which a contour is not detected in this way (contour detection has failed).
- FIG. 15 is a block diagram showing a configuration of the ultrasonic diagnostic apparatus 3 according to the present embodiment.
- the ultrasonic diagnostic apparatus 3 includes a designation unit 102A and a manual correction unit 103A. Further, the ultrasonic diagnostic apparatus 3 includes a confluence determination unit 101 ⁇ / b> A inside the contour extraction unit 101. Since the functional blocks excluding the contour extraction unit 101 are the same as those of the ultrasonic diagnostic apparatus 1, description thereof is omitted.
- the designation unit 102A accepts designation information for designating a frame (manual correction target image) for manually correcting the blood vessel contour and correction information indicating the content of correction for the frame from the user.
- the designation unit 102A accepts information indicating a blood vessel contour that has not been extracted by the contour extraction unit 101 as correction information.
- the designation unit 102A accepts contour information described as “undetected contour” as correction information.
- the manual correction unit 103A corrects the blood vessel contour of the frame specified by the specification information received from the user by the specification unit 102A based on the correction information received from the user, and stores the correction result in the corrected contour memory 106. Further, the manual correction unit 103 ⁇ / b> A inputs the manually corrected frame identification information to the target setting unit 104. Here, the manual correction unit 103A performs correction by forming the blood vessel contour based on the information included in the correction information and indicating the blood vessel contour not extracted by the contour extraction unit 101.
- the confluence determination unit 101A acquires the contour extracted by the contour extraction unit 101, and when there are a plurality of contours and the plurality of contours overlap each other, the plurality of overlapping contours are integrated to obtain one contour. Form.
- the formed contour is stored in the corrected contour memory 106 as a corrected contour postEdit.
- FIG. 16 is an explanatory diagram of correction information and designation information of the ultrasonic diagnostic apparatus 3 according to the present embodiment.
- the designation unit 102A receives correction information including a contour of the blood vessel that was desired to be extracted by the contour extraction unit 101 in the ultrasonic image as a contour to be added from the user ((a) in FIG. 16).
- the designation unit 102A receives designation information for designating a frame (manual correction target image) for manually correcting the blood vessel contour from the user. ((B) of FIG. 16). Using these correction information and designation information, the blood vessel contour is corrected as in the first embodiment.
- FIG. 17 is a flowchart of the merging process according to the third embodiment.
- step S1701 the confluence determination unit 101A determines whether or not the ultrasound image includes a plurality of blood vessel contours.
- the plurality of blood vessels include blood vessels added based on the correction information received by the designation unit 102A from the user. If it is determined that a plurality of blood vessel contours are included, the process advances to step S1702. If it is determined that the contours of a plurality of blood vessels are not included, the merging process is terminated.
- step S1702 the confluence determination unit 101A determines whether there are overlapping outlines among the outlines of the plurality of blood vessels. If it is determined that there are overlapping contours, the process advances to step S1703. If it is determined that there are no overlapping contours, the merging process is terminated.
- step S1703 the merging determination unit 101A generates one contour by integrating the contours of a plurality of blood vessels that overlap each other.
- FIG. 18 is an explanatory diagram of the merging process according to the present embodiment.
- the frames 1801, 1802, 1803, 1803A, 1804, and 1805 shown in FIG. 18 are ultrasonic images acquired from spatially continuous positions. Moreover, in FIG. 18, the outline of the blood vessel contained in these frames is schematically represented. The ultrasonic diagnostic apparatus 3 corrects the contour from the frame 1801 to 1805.
- the outline of the blood vessel 1 and the outline of the blood vessel 2 exist in each of the frames 1801 and 1802. Further, the outline of the blood vessel 1 and the outline of the blood vessel 2 exist without overlapping each other. If the ultrasonic diagnostic apparatus 3 performs the above-described merge determination for these frames, it is determined in step S1702 that there are no overlapping contours, and the merge process is terminated.
- the contour of the blood vessel 1 and the contour of the blood vessel 2 exist so as to overlap each other.
- the ultrasonic diagnostic apparatus 3 performs the above-described merge determination for this frame, in step S1703, the outlines of the overlapping blood vessels 1 and 2 are integrated to generate one outline.
- the generated contour is shown in a frame 1803A. Note that, for example, it may be determined that a merge has occurred when the ratio of the area of the overlapping region to the area in the outline exceeds a threshold value.
- the contour of the blood vessel 1 and the contour of the blood vessel 2 exist so as to overlap each other so as to be larger than the frame 1803. Since the ultrasound diagnostic apparatus 3 is after generating one contour of the frame 1803A as described above, the blood vessel contour is generated by performing a search process using one contour of the frame 1803A as an initial contour.
- the outline of the blood vessel 3 exists in the frame 1805.
- the ultrasonic diagnostic apparatus 3 generates a blood vessel contour by performing a search process using one contour of the frame 1804 as an initial contour.
- the ultrasonic diagnostic apparatus 3 can perform from the ultrasonic image 1801 in which two contours of the blood vessel 1 and the blood vessel 2 exist to the ultrasonic image 1805 in which one contour of the blood vessel 3 exists. It is possible to correctly generate the blood vessel contour.
- a Y-shaped blood vessel can be extracted using the contour information specified by the user.
- FIG. 19 is an explanatory diagram of blood vessel extraction processing according to the third embodiment.
- FIG. 19A shows an example in which the contours of Y-shaped blood vessels in a plurality of ultrasonic images are generated from the contours of three blood vessels designated by the user.
- the user browses a plurality of ultrasonic images and designates the blood vessel contour indicated by positions 1901, 1902, and 1903 among Y-shaped blood vessels.
- the user acquires a plurality of ultrasonic images so as to include a branch portion of the Y-shaped blood vessel. Can do.
- the ultrasonic diagnostic apparatus 3 generates a blood vessel contour from each of the positions 1901, 1902, and 1903 in the respective directions before and after the traveling direction of the blood vessel. For example, when the blood vessel contour is first generated from each of the positions 1901 and 1903 and then the blood vessel contour is generated from the position 1902, the merging process is performed.
- the contour of the Y-shaped blood vessel can be accurately generated.
- FIG. 19B shows an example in which the contours of Y-shaped blood vessels in a plurality of ultrasound images are generated from the contours of three blood vessels designated by the user in a specific ultrasound image.
- the specific ultrasonic image is an ultrasonic image of an end portion in the blood vessel traveling direction among a plurality of ultrasonic images.
- the blood vessel contour generation process and the merging process are performed in the same manner as in FIG. In the method of FIG. 19B, the user does not need to designate an ultrasonic image, so that the user's trouble can be reduced.
- a blood vessel contour that is not first extracted by the ultrasonic diagnostic apparatus can be newly formed by user designation.
- these blood vessels can be regarded as one blood vessel and a blood vessel contour can be formed.
- a Y-shaped blood vessel contour that has not been extracted by the ultrasonic diagnostic apparatus can be newly formed by the user's designation.
- FIG. 26 is an explanatory diagram when the contour extraction method of each of the above embodiments is implemented by a computer system using a program recorded on a recording medium such as a flexible disk.
- FIG. 26 (b) shows the appearance, cross-sectional structure, and flexible disk as seen from the front of the flexible disk
- FIG. 26 (a) shows an example of the physical format of the flexible disk that is the main body of the recording medium.
- the flexible disk FD is built in the case F, and a plurality of tracks Tr are formed concentrically on the surface of the disk from the outer periphery toward the inner periphery, and each track is divided into 16 sectors Se in the angular direction. ing. Therefore, in the flexible disk storing the program, the program is recorded in an area allocated on the flexible disk FD.
- FIG. 26C shows a configuration for recording and reproducing the program on the flexible disk FD.
- the program for realizing the contour extraction method is recorded on the flexible disk FD
- the program is written from the computer system Cs via the flexible disk drive.
- the contour extraction method for realizing the contour extraction method by the program in the flexible disk is constructed in the computer system
- the program is read from the flexible disk by the flexible disk drive and transferred to the computer system.
- the recording medium is not limited to this, and any recording medium such as an IC card or a ROM cassette capable of recording a program can be similarly implemented.
- the block of the ultrasonic diagnostic apparatus in FIG. 1 is typically realized as an LSI (Large Scale Integration) that is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them.
- LSI Large Scale Integration
- LSI Integrated Circuit
- IC Integrated Circuit
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- a dedicated circuit for graphics processing such as GPU (Graphic Processing Unit) can be used.
- An FPGA Field Programmable Gate Array
- a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
- each means may be performed via a network.
- a network such as the Internet or a LAN (Local Area Network).
- a network such as the Internet or a LAN (Local Area Network).
- LAN Local Area Network
- a configuration in which an ultrasonic image held in a server or storage device on a network is read is possible.
- the function addition of each means may be performed via a network.
- the ultrasonic diagnostic apparatus in each of the above embodiments is realized as, for example, the ultrasonic diagnostic apparatus 3 shown in FIG.
- the ultrasonic diagnostic apparatus and the contour extraction method according to the present invention when correcting the contour of the vascular membrane automatically extracted from a plurality of spatially continuous ultrasound images, the user can When the contour is manually corrected, the time required for correcting the blood vessel contour can be significantly reduced by automatically correcting the contour of the adjacent ultrasonic image based on the manual correction result. Therefore, the ultrasonic diagnostic apparatus and method according to the present invention can be used particularly in the medical diagnostic equipment industry because it can reduce the examination time in a diagnosis that requires measurement of the thickness of the vascular membrane such as arteriosclerosis.
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Abstract
Description
本発明者は、「背景技術」の欄において記載した、超音波画像の輪郭抽出方法に関し、以下の問題が生じることを見出した。
実施の形態1の超音波診断装置および方法について、図面を参照しながら説明する。実施の形態1の超音波診断装置1は、空間的に連続する超音波画像から自動的に抽出した血管の輪郭(血管輪郭)を補正する際に、1枚のフレームを手動で補正すると、近接する複数のフレームの血管輪郭を新たに抽出することにより、自動的に補正するという特徴を有する。なお、血管は、器官の一例であり、血管の輪郭は、器官の輪郭の一例である。
実施の形態2の超音波診断装置および方法について、図面を参照しながら説明する。本実施の形態の超音波診断装置2は、各超音波画像における補正前あるいは補正後の血管輪郭に基づいて、血管の3次元像を構築し、表示する点において超音波診断装置1と異なる。以下では、3次元像の構築に関わる各機能について説明する。その他の機能については超音波診断装置1と同一であるので、同一符号を付記して説明を省略する。
実施の形態3の超音波診断装置および方法について、図面を参照しながら説明する。本実施の形態の超音波診断装置3は、各超音波画像における補正後の血管輪郭が複数存在し、それらが互いに重なり合っているときに、重なり合っている複数の血管輪郭を統合して1つの血管輪郭とする点において超音波診断装置1と異なる。以下では、血管輪郭の統合に関わる各機能について説明する。その他の機能については超音波診断装置1と同一であるので、同一符号を付記して説明を省略する。
上記各実施の形態で示した輪郭抽出方法を実現するためのプログラムを、フレキシブルディスク等の記録媒体に記録するようにすることにより、上記実施の形態で示した処理を、独立したコンピュータシステムにおいて簡単に実施することが可能となる。
101、1701、2301 輪郭抽出部
101A 合流判定部
102、102A、1702、2302 指定部
103、103A、1703、2303 手動補正部
104 対象設定部
105 補正情報生成部
106、202、1704、2304 補正後輪郭メモリ
107、203、1705、2305 表示部
201 3次元像生成部
1101 Bモード画像
1102 拡大画像
1103 スライドバー
1104 枠
Claims (17)
- 空間的に連続する位置から取得された複数の超音波画像のそれぞれに含まれる器官の像から前記器官の輪郭を抽出する輪郭抽出部と、
前記輪郭抽出部が抽出した前記輪郭のうちユーザが手動補正を行う対象である前記輪郭を含む手動補正対象画像を、前記複数の超音波画像の中から指定するための指定情報と、前記手動補正の内容を示す補正情報とを、前記ユーザから受け付ける指定部と、
前記指定部が受け付けた前記指定情報により指定される前記手動補正対象画像に対して、前記輪郭抽出部が抽出した前記輪郭を前記補正情報に基づいて補正する輪郭補正部とを備え、
前記輪郭抽出部は、さらに、
前記輪郭補正部が補正した後の前記手動補正対象画像に含まれる前記輪郭を示す情報に基づいて前記複数の超音波画像のうち前記手動補正対象画像と異なる画像である対象画像に含まれる新たな輪郭を抽出する
超音波診断装置。 - 前記輪郭抽出部は、
前記輪郭補正部が補正した後の前記手動補正対象画像に含まれる前記輪郭を示す情報を初期輪郭として探索処理を行い、前記探索処理により得られた輪郭を前記新たな輪郭として抽出する
請求項1に記載の超音波診断装置。 - 前記輪郭抽出部は、
前記複数の超音波画像のうち、前記手動補正対象画像に隣接する画像である前記対象画像に対して前記探索処理を行い、前記探索処理により得られた輪郭を前記新たな輪郭として抽出する
請求項2に記載の超音波診断装置。 - 前記輪郭抽出部は、
前記器官の像から抽出した前記器官の輪郭の形状に対して、前記探索処理により得られた輪郭の形状が所定以上変化した場合に、前記探索処理により得られた輪郭を前記新たな輪郭として抽出する
請求項2又は3に記載の超音波診断装置。 - 前記輪郭抽出部は、さらに、
前記対象画像に対する前記探索処理により得られた前記新たな輪郭を示す情報を初期輪郭情報として、前記複数の超音波画像のうちの画像であって、前記手動補正対象画像及び前記対象画像とは異なる新たな対象画像に対して、前記新たな対象画像に含まれる前記輪郭を探索する探索処理を行い、当該探索処理により得られた輪郭を前記新たな輪郭として抽出する
請求項2~4のいずれか1項に記載の超音波診断装置。 - 前記輪郭抽出部は、
前記複数の超音波画像のうち、前記対象画像に隣接する画像である前記新たな対象画像に対して前記探索処理を行い、前記探索処理により得られた輪郭を前記新たな輪郭として抽出する
請求項5に記載の超音波診断装置。 - 前記輪郭抽出部は、
前記複数の超音波画像のうち、前記手動補正対象画像に近い画像から順に、当該画像を前記新たな対象画像として前記探索処理を行い、
当該探索処理は、直前の探索処理によって抽出された前記器官の輪郭を示す情報を初期輪郭として行われる
請求項5又は6に記載の超音波診断装置。 - 前記輪郭抽出部は、
前記器官の像から抽出した前記器官の輪郭の形状に対して、当該探索処理により得られた輪郭の形状が所定以上変化しなくなるまで探索処理を行う
請求項7に記載の超音波診断装置。 - 前記輪郭抽出部は、
前記器官の輪郭として、血管膜の輪郭を抽出する
請求項1~8のいずれか1項に記載の超音波診断装置。 - 前記輪郭抽出部は、
前記器官の輪郭として、血管膜の内膜又は外膜の輪郭を抽出する
請求項1~9のいずれか1項に記載の超音波診断装置。 - 前記輪郭抽出部は、
前記複数の超音波画像のうち、前記手動補正対象画像が取得された位置に近い位置から取得された画像から順に、当該画像を前記新たな対象画像として前記探索処理を行い、
当該探索処理は、当該探索処理により得られた前記内膜の輪郭と前記外膜の輪郭との間の距離が閾値以下となるまで行われる
請求項10に記載の超音波診断装置。 - 前記超音波診断装置は、さらに、
前記複数の超音波画像のそれぞれに対して前記輪郭抽出部が抽出した前記器官の輪郭を、超音波画像が取得された位置に基づいて統合することで、前記器官の3次元像を生成する3次元像生成部を備える
請求項1~11のいずれか1項に記載の超音波診断装置。 - 前記指定部は、
前記手動補正対象画像に含まれる前記器官の像の輪郭を示す追加輪郭情報を、前記補正情報として前記ユーザから受け付け、
前記輪郭補正部は、
前記手動補正対象画像において前記補正情報に基づいて前記輪郭を形成することで前記補正を行う
請求項1~12のいずれか1項に記載の超音波診断装置。 - 前記輪郭抽出部は、さらに、
前記補正又は形成後の複数の前記輪郭が互いに重なり合う場合に、重なり合った複数の前記輪郭を統合することで1つの輪郭を形成し、形成した前記輪郭を前記新たな輪郭として抽出する
請求項13に記載の超音波診断装置。 - 前記指定部は、
前記器官の像を1つ含む画像である第一画像、及び、前記器官の像を2つ含む画像である第二画像を前記手動補正対象画像として指定するための前記指定情報と、前記第一画像に含まれる1つの前記器官の像の輪郭、及び、前記第二画像に含まれる2つの前記器官の像の輪郭を示す前記追加輪郭情報を前記補正情報として受け付け、
前記輪郭補正部は、
前記第一画像及び前記第二画像のそれぞれにおいて、前記補正情報に基づいて前記輪郭を形成することで前記補正を行う
請求項13又は14に記載の超音波診断装置。 - 超音波診断装置における輪郭抽出方法であって、
空間的に連続する位置から取得された複数の超音波画像のそれぞれに含まれる器官の像から前記器官の輪郭を抽出する輪郭抽出ステップと、
前記輪郭抽出ステップで抽出した前記輪郭に対してユーザが手動補正を行う対象である前記輪郭を含む手動補正対象画像を、前記複数の超音波画像の中から指定するための指定情報と、前記手動補正の内容を示す補正情報とを、前記ユーザから受け付ける指定ステップと、
前記指定ステップで受け付けた前記指定情報により指定される前記手動補正対象画像に対して、前記輪郭抽出ステップで抽出した前記輪郭を前記補正情報に基づいて補正する輪郭補正ステップとを含み、
前記輪郭抽出ステップでは、さらに、
前記輪郭補正ステップで補正した後の前記手動補正対象画像に含まれる前記輪郭を示す情報に基づいて前記複数の超音波画像のうち前記手動補正対象画像と異なる画像である対象画像に含まれる新たな輪郭を抽出する
輪郭抽出方法。 - 請求項16に記載の輪郭抽出方法をコンピュータに実行させるためのプログラム。
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