WO2006043529A1 - 超音波診断装置 - Google Patents
超音波診断装置 Download PDFInfo
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- WO2006043529A1 WO2006043529A1 PCT/JP2005/019089 JP2005019089W WO2006043529A1 WO 2006043529 A1 WO2006043529 A1 WO 2006043529A1 JP 2005019089 W JP2005019089 W JP 2005019089W WO 2006043529 A1 WO2006043529 A1 WO 2006043529A1
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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
- A61B8/46—Ultrasonic, sonic or infrasonic diagnostic devices with special arrangements for interfacing with the operator or the patient
- A61B8/461—Displaying means of special interest
-
- 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
-
- 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
- A61B8/485—Diagnostic techniques involving measuring strain or elastic properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
- G01S15/8906—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
- G01S15/8979—Combined Doppler and pulse-echo imaging systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
- G01S7/52023—Details of receivers
- G01S7/52036—Details of receivers using analysis of echo signal for target characterisation
- G01S7/52042—Details of receivers using analysis of echo signal for target characterisation determining elastic properties of the propagation medium or of the reflective target
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
- G01S7/52053—Display arrangements
- G01S7/52057—Cathode ray tube displays
- G01S7/5206—Two-dimensional coordinated display of distance and direction; B-scan display
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52017—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 particularly adapted to short-range imaging
- G01S7/52053—Display arrangements
- G01S7/52057—Cathode ray tube displays
- G01S7/5206—Two-dimensional coordinated display of distance and direction; B-scan display
- G01S7/52066—Time-position or time-motion displays
Definitions
- the present invention relates to an ultrasonic diagnostic apparatus that measures a property characteristic value in a living tissue.
- Arteriosclerosis is closely related to the onset of myocardial infarction and cerebral infarction. Specifically, if an atheroma is formed on the artery wall or if new cells of the artery cannot be made due to various factors such as hypertension, the artery loses its elasticity and becomes stiff and brittle. Then, the blood vessel is occluded in the part where the atheroma is formed, or the vascular tissue covering the atheroma is ruptured and the atheroma flows into the blood vessel, and the artery is occluded in another part or the artery is hardened These diseases can be caused by the rupture of parts. Therefore, early diagnosis of arteriosclerosis is important for the prevention and treatment of these diseases.
- arteriosclerosis can be diagnosed early and a therapeutic agent for arteriosclerosis can be administered to a subject, it will be effective in treating arteriosclerosis.
- a therapeutic agent for arteriosclerosis can be administered to a subject, it will be effective in treating arteriosclerosis.
- arteriosclerosis progresses, it is said that it is difficult to completely recover the arteriosclerosis even though the therapeutic agent can suppress the progression of arteriosclerosis.
- Ultrasound diagnostic equipment is one of the non-invasive medical diagnostic equipment that places less burden on the subject, and does not require the administration of contrast media to the subject compared to the same non-invasive X-ray diagnostic equipment.
- Non-Patent Document 1 uses the method of Patent Document 1 to measure the elastic characteristics of the arterial wall and display a two-dimensional distribution of the elastic modulus characteristics in a color tone according to the magnitude of the elastic modulus characteristics.
- Non-Patent Document 1 identifies each tissue of the iliac artery wall by staining the iliac artery in vitro after measuring the elastic properties of the iliac artery, and identifies the tissue identified by staining. Measurements using position information determine which organization each elastic property in the obtained two-dimensional distribution belongs to. Further, it is disclosed that the elastic characteristics of the determined tissue are analyzed by a histogram, and the type of the two-dimensional distribution force tissue of the elastic characteristics of the arterial wall is estimated based on the analysis result.
- Patent Document 1 Japanese Patent Laid-Open No. 10-5226
- Non-Patent Document 1 As disclosed in Non-Patent Document 1 and the like, by displaying the measured elastic characteristics of each part of the subject in a two-dimensional distribution, it is possible to easily identify a specific part of the elastic modulus in the subject. It becomes like this. However, when the value of the elastic characteristic varies in the tissue to be diagnosed in the subject or in a predetermined region, it is difficult to understand what value the elastic property of the entire tissue or region is. For this reason, accurate pathological diagnosis may be difficult based on the elastic characteristics of the subject.
- the present invention solves such a problem and makes it possible to more accurately perform pathological diagnosis of a subject based on a property characteristic value of the subject obtained by transmitting and receiving ultrasonic waves such as elastic properties.
- An object of the present invention is to provide an ultrasonic diagnostic apparatus.
- the ultrasonic diagnostic apparatus of the present invention is obtained by reflecting a transmission unit that drives a probe for transmitting ultrasonic waves to a subject, and the ultrasonic wave is reflected on the living tissue.
- a receiving unit that amplifies a reflected echo received by the tentacle and generates a received signal; an image processing unit that generates a tomographic image of the subject based on the received signal; and an arbitrary one in the tomographic image
- a region setting unit that sets a range of the target region as a target region, a motion information measuring unit that obtains motion information of the subject at a plurality of measurement positions set on the subject from the received signal, and the motion information,
- a characteristic value calculation unit for obtaining property characteristic values of a plurality of target tissues of the subject specified by a plurality of measurement positions; and the target set by the region setting unit for acquiring the plurality of property characteristic values.
- a distribution creating unit that obtains a frequency distribution of the property characteristic values from the property characteristic values of the target tissue.
- the property characteristic value obtained by the characteristic value calculation unit is selected from the group force consisting of the maximum thickness change amount, strain, and elastic characteristic force of the subject.
- the region setting unit sets the target region based on a signal from an input unit provided outside.
- the region setting unit defines at least one boundary in the subject based on the characteristics of the received signal caused by a difference in acoustic characteristics in the subject.
- the distribution creating unit determines the property for each region divided by the boundary. Find the frequency distribution of characteristic values.
- the characteristic of the received signal is amplitude information of the received signal.
- the region setting unit determines at least one boundary in the subject based on the property characteristic value, and the distribution creating unit includes the boundary The frequency distribution of the property characteristic values is obtained for each area divided by
- the region setting unit determines at least one boundary in the subject based on the motion information, and the distribution creating unit includes the boundary The frequency distribution of the property characteristic values is obtained for each region divided by
- the motion information includes a time change amount of the position of the subject at a plurality of measurement positions and a time change of two thicknesses defining the target tissue. It is at least one of the conversion amounts.
- the subject includes a blood vessel wall tissue having an intima region, a medial region, and an adventitia region
- the region setting unit includes a blood vessel cavity, an intima region, And at least one boundary selected between the boundary between the intima region and the intima region, the boundary between the intima region and the adventitia region, and the boundary between the adventitia region and the extravascular tissue.
- the distribution creating unit creates a histogram as a frequency distribution of property characteristic values.
- the ultrasonic diagnostic apparatus further includes a display for displaying the tomographic image and the frequency distribution.
- the image processing unit obtains the plurality of property characteristic values, and further generates a two-dimensional distribution image of the plurality of property characteristic values in the subject.
- the ultrasonic diagnostic apparatus further includes a display for displaying the tomographic image, the frequency distribution, and the two-dimensional distribution image.
- the characteristic value calculation unit updates the plurality of property characteristic values in a predetermined cycle, and the distribution generation unit and the image processing unit synchronize with the update of the property characteristic values. , Update the frequency distribution and the two-dimensional distribution image, respectively.
- the characteristic force of the subject in an arbitrary range can be generated and displayed by creating a frequency distribution of the property characteristic values of the subject in the range. Therefore, the operator or the person who diagnoses the subject can easily recognize the value of the elastic characteristic of the region to be diagnosed.
- the operator when the operator sets a target region for each constituent tissue of the subject, the operator can refer to the frequency distribution of the elastic characteristics for each constituent tissue. As a result, the subject can be diagnosed more accurately.
- FIG. 1 is a diagram showing an example of a configuration for measuring the elastic modulus of a blood vessel wall using the ultrasonic diagnostic apparatus according to the first embodiment.
- FIG. 2 is a block diagram showing the configuration of the first embodiment of the ultrasonic diagnostic apparatus.
- FIG. 3 is an explanatory diagram showing an example of a screen displayed on the display unit by the ultrasonic diagnostic apparatus shown in FIG. 2.
- FIG. 4 is an explanatory diagram showing an example of a screen displayed on the display unit by the ultrasonic diagnostic apparatus according to the second embodiment.
- FIG. 5 is a graph showing an example of a histogram of elastic characteristics of the outer membrane region.
- (B) is a graph showing an example of a histogram of elastic characteristics of the medial region.
- (C) is a graph showing an example of a histogram of elastic characteristics of the intima region.
- FIG. 6 is a graph showing an example of a histogram of elastic characteristics of the entire blood vessel wall (inner, inner and outer membranes).
- FIG. 7 is a diagram for explaining a measurement position set in a blood vessel wall.
- the first embodiment will be described below. Here, an example in which the elastic characteristics of a blood vessel wall are measured by an ultrasonic diagnostic apparatus will be described.
- FIG. 1 is a diagram showing an example of a configuration for measuring the elastic modulus of a blood vessel wall using the ultrasonic diagnostic apparatus according to the first embodiment.
- the ultrasonic diagnostic apparatus 100 is connected to an ultrasonic probe 200, a display 300, a sphygmomanometer 400, an electrocardiograph 500, and an input unit 600.
- the ultrasonic probe 200 is a probe that transmits and receives ultrasonic waves. As shown in FIG. 1, the ultrasonic probe 200 is brought into close contact with the biological surface 2 of the subject by the operator, and the blood vessel 3 Send ultrasonic waves to the. The ultrasonic waves are reflected by the inside of the living body 1, the blood vessel wall 4 constituting the blood vessel 3, the blood fluid 5, etc., become reflected echoes, and return to the ultrasonic probe 200.
- the ultrasonic diagnostic apparatus 100 receives a reflected echo using the ultrasonic probe 200 and analyzes the reflected echo to display a tomographic image of the inside 1 of the living body including the blood vessel 3 on the display 300.
- the display device 300 is a monitor or the like.
- the sphygmomanometer 400 measures the blood pressure of the subject.
- the electrocardiograph 500 measures the state of the subject's heart.
- the input unit 600 is an input device such as a mouse, a keyboard, or a touch panel.
- the operator sets the region of interest in the subject of the subject by operating the input unit 600 by a method described later.
- the ultrasonic diagnostic apparatus 100 obtains the frequency distribution of the elastic modulus in the set region of interest, and displays the obtained frequency distribution on the display 300.
- FIG. 2 is a block diagram showing the configuration of the ultrasonic diagnostic apparatus 100.
- the ultrasonic diagnostic apparatus 100 includes a transmission unit 101, a reception unit 102, a delay time control unit 103, a motion information measurement unit 104, a region setting unit 107, a characteristic value calculation unit 105, and a calculation data storage unit 106.
- a distribution creating unit 108, a control unit 109, and an image processing unit 110 are provided.
- the control unit 109 includes a transmission unit 101, a reception unit 102, a delay time control unit 103, a motion information measurement unit 104, a region setting unit 107, a characteristic value calculation unit 105, a distribution creation unit 108, and an image processing unit 110. Control.
- the transmitting unit 101 transmits a predetermined drive pulse signal to the ultrasonic probe 200.
- the ultrasonic probe 200 acquires the drive pulse signal and transmits the ultrasonic wave toward the subject. Further, the ultrasonic probe 200 receives a reflected echo reflected from the subject and converts the reflected echo into an electrical signal.
- the receiving unit 102 receives the electric signal from the ultrasonic probe 200 and amplifies it to generate a received signal. Further, the reception unit 102 converts the amplified reception signal into a digital signal by an AZD conversion unit (not shown).
- the delay time control unit 103 controls the transmission unit 101 so as to delay-control the drive pulse signal transmitted to the piezoelectric element group of the ultrasonic probe 200. From the fact that the drive pulse signal is delay-controlled, the transmission direction or focal depth of the ultrasonic wave transmitted from the ultrasonic probe 200 is controlled (wave transmission focus). In addition, the delay time control unit 103 is a reception unit 1 The received signal is acquired from 02, and the received signal is delayed to control the received signal from multiple directions (receive focus), and the motion information measurement unit 104 and image processing are performed. Output to part 110.
- the motion information measurement unit 104 uses the received signal obtained by the delay time control unit 103 to measure motion information of the subject at a plurality of measurement positions provided in the subject. Specifically, the amount of time variation of the position of the subject at a plurality of measurement positions provided on the subject and the thickness of the plurality of target tissues of the subject specified by the plurality of measurement positions are determined by a method described later. Measure the amount of time change.
- These pieces of exercise information measured here are output to the characteristic value calculation unit 105 and the calculation data storage unit 106. In this embodiment, the exercise information is output to the characteristic value calculation unit 105 and the calculation data storage unit 106, but the exercise information is output to either the characteristic value calculation unit 105 or the calculation data storage unit 106. .
- the characteristic value calculation unit 105 obtains the property characteristic value of each target tissue of the subject from the exercise information obtained by the exercise information measurement unit 104. Specifically, the maximum thickness change and strain between two points that define each target structure are determined by the method described later. Further, the characteristic value calculation unit 105 uses the blood pressure data measured by the sphygmomanometer 400 and the maximum thickness change amount to obtain the elastic characteristic of each target tissue by a method described later.
- the property characteristic value is output to the calculation data storage unit 106 and the distribution creation unit 108. In this embodiment, the property characteristic value is output to the calculation data storage unit 106 and the distribution creation unit 108, but the property characteristic value is output only to either the calculation data storage unit 106 or the distribution generation unit 108. Also good.
- the electrocardiogram waveform obtained by the electrocardiograph 500 is output to the motion information measurement unit 104 and the characteristic value calculation unit 105, and is used as a trigger signal for determining the timing of data acquisition and data reset.
- the trigger signal may be any signal that can be connected to the ultrasound diagnostic apparatus 100 and used as a trigger signal.
- the region setting unit 107 acquires region information of a region of interest (ROI: Region Of Interest) set from the input unit 600 by the operator.
- ROI region of interest
- the information includes information indicating the position and range of the ROI, and identifies the target region in the tomographic image of the subject as will be described in detail below.
- the distribution creation unit 108 uses the region information obtained by the region setting unit 107 and the property characteristic value obtained by the characteristic value calculation unit 105 to calculate the frequency distribution of the property characteristic value in ROI. create.
- the image processing unit 110 creates image data such as a tomographic image of the subject from the reception signal output from the delay time control unit 103. Further, the image processing unit 110 outputs the frequency distribution created by the distribution creating unit 108 to the display device 300 together with the tomographic image of the subject. Further, the image processing unit 110 outputs the region information obtained by the region setting unit 107 to the display device 300.
- the calculation data storage unit 106 is configured by a semiconductor memory, a hard disk, or the like, and stores exercise information obtained by the exercise information measurement unit 104 and property characteristic values obtained by the characteristic value calculation unit 105.
- the motion information and property characteristic values stored in the calculation data storage unit 106 are read from the calculation data storage unit 106 and displayed on the display device 300 through processing in the image processing unit 110 in accordance with an operator command. .
- the property characteristic values are converted into the same number distribution by the distribution creating unit 108 and displayed on the display 300.
- the display mode of the motion information and elastic characteristics stored in the arithmetic data storage unit 106 is not limited to the frequency distribution, and it is only necessary that the motion information and elastic characteristics stored in the arithmetic data storage unit 106 are expressed! /.
- the ultrasonic diagnostic apparatus 100 when the operator diagnoses the blood vessel 3 of the subject will be described in detail.
- the transmission unit 101 is transmitted and focused by the delay time control unit 103, whereby the drive pulse signal is transmitted to the ultrasonic probe 200.
- the ultrasonic probe 200 transmits the ultrasonic wave toward the inside 1 of the living body.
- the ultrasonic wave is reflected by the inside of the living body 1, the blood vessel wall 4, and the blood 5, becomes a reflected echo signal, and is received by the ultrasonic probe 200.
- the reflected echo received by the ultrasonic probe 200 is converted into an electrical signal. Electric
- the air signal is amplified by the receiving unit 102 and converted into a digital signal after becoming a received signal.
- the reception signal digitally converted by the reception unit 102 is output to the delay time control unit 103.
- Delay time control section 103 performs reception focus processing by delay controlling the received signal, and outputs the result to motion information measuring section 104 and image processing section 110.
- the motion information measurement unit 104 obtains motion information such as a thickness change amount from the received signal by the following method.
- the method for obtaining force / motion information using phase detection suitable for obtaining high-resolution motion information as a method for obtaining motion information is not limited to this.
- envelope detection, etc. May be used.
- Motion information measuring section 104 performs phase detection on the received signal acquired from delay time control section 103 and separates it into a real part signal and an imaginary part signal. The separated real part signal and imaginary part signal are filtered, and reflection components and noise components from other than the measurement target are removed.
- FIG. 7 schematically shows an ultrasonic acoustic line 10 transmitted from the ultrasonic probe 200 and propagating through the blood vessel wall 4 of the subject.
- measurement positions a, a, a,... 'A are set on the acoustic line 10 at predetermined intervals. Two adjacent measurements
- the wave probe 200 scans the blood vessel wall 4 with ultrasonic waves in the longitudinal direction (the direction in which the blood vessel extends). For this reason, in actual measurement, a plurality of acoustic lines 10 parallel to each other exist at a predetermined interval. As a result, the measurement position is two-dimensionally arranged in the subject, and the target tissue specified by the measurement position is also two-dimensionally arranged in the subject.
- the target tissue is generally defined by adjacent measurement positions, but the measurement position a
- An area defined by two or more measurement positions such as 3 may be the target tissue.
- the motion information measurement unit 104 uses the real part signal and the imaginary part signal, for example, to obtain the motion speed of the subject at each measurement position by the constrained least square method.
- the motion information measuring unit 104 obtains a time displacement amount of the position of the subject at each measurement position by time integrating the motion speed.
- the amount of change in the thickness of each target tissue is determined by determining the difference in the amount of time displacement between two adjacent measurement positions located on the same acoustic line. As described above, the area defined by two or more measurement positions If the target tissue is the target tissue, find the difference in the amount of time displacement of the position at the two measurement positions that define the position of the target tissue.
- the interval between each measurement position may be set to 80 ⁇ m, and the amount of change in thickness of the target tissue set at 80 ⁇ m intervals may be obtained, or the target tissue may be determined at 160 m or 240 m intervals. You may set it with.
- the thickness change amount obtained here may be any thickness change amount between two points, regardless of the calculation method described above.
- the characteristic value calculation unit 105 obtains the difference between the maximum value and the minimum value of the thickness change amounts of the plurality of target tissues obtained by the motion information measurement unit 104 in any period, and determines the maximum thickness change amount. Calculate the strain between two points from the maximum thickness variation.
- the strain S when the maximum thickness change amount is A h and the maximum thickness of the subject is H is obtained by the following equation (1), for example.
- the characteristic value calculation unit 105 further obtains an elastic characteristic between each two points from the blood pressure data acquired from the sphygmomanometer 400 and the strain amount obtained by the equation (1). If the difference between the maximum and minimum blood pressure values obtained from the sphygmomanometer 400 (pulse pressure) is ⁇ during the period when the maximum and minimum values of thickness change are obtained, the elastic characteristic ⁇ is For example, it is obtained by the following equation (2).
- the maximum thickness variation ⁇ h, the pulse pressure ⁇ p, and the maximum thickness H change every heartbeat. For this reason, it is preferable to obtain the maximum value and the minimum value of the thickness change amount of the target tissue for each cardiac cycle.
- the maximum thickness variation A h and strain S are also determined for each cardiac cycle.
- the elastic characteristic E is also determined for each cardiac cycle using the maximum and minimum blood pressure values obtained for each cardiac cycle. In other words, the property value such as elastic property E is updated for each cardiac cycle.
- the image processing unit 110 creates tomographic image data of the blood vessel 3 from the reception signal obtained by the delay time control unit 103 and outputs the image data to the display device 300.
- the display mode of the display device 300 is not limited to the following example.
- FIG. 3 is an explanatory diagram showing an example of a display mode of the display device 300.
- the table The display screen of the display 300 includes a tomographic image display area 301, an elastic characteristic ROI 302, and histogram display areas 303a, 303b, and 303c.
- the tomogram display area 301 displays a tomogram image of the subject created based on the image data output from the image processing unit 110.
- the tomographic image display area 301 displays the blood vessel wall 4 of the blood vessel 3 as a subject in B mode.
- the blood vessel wall 4 is also composed of an outer membrane 41, a middle membrane 42, and an inner membrane 43.
- the outer membrane 41, the inner membrane 42, and the inner membrane 43 are schematically shown.
- the elastic characteristic ROI 302 is an ROI set to an operator's desired size (range), position, and the like.
- the motion information measuring unit 104 and the characteristic value calculating unit 105 measure the characteristic characteristic values such as the maximum thickness variation, strain, and elastic characteristic of the target tissue of the subject at least in the range of the elastic characteristic ROI302.
- the target tissues are two-dimensionally arranged, and the elastic characteristic ROI 302 includes a plurality of target tissues arranged two-dimensionally.
- the elastic characteristic ROI 302 indicating the set size and position is displayed in the tomographic image display area 301 in real time. For example, as shown in FIG. 3, the elastic characteristic ROI 302 is set in size and position so as to cover the blood vessel wall 4 in the vertical direction.
- the elastic characteristic ROI 302 includes histograms ROI 302a, 302b, and 302c.
- the histogram ROIs 302a to 302c are ROIs set to the desired number, size (range), position, etc. of the operator.
- the histograms ROI 302a to 302c are target ranges for creating a histogram.
- Histograms ROI 302 a to 302 c representing the set size, position, and number are displayed in real time in the slice image display area 301.
- the size, position, and number of histograms ROI 302a are for the outer membrane 41 of the blood vessel wall 4
- histogram ROI 302b is for the middle membrane 42
- histogram ROI 302C is for the inner membrane 43. Is set.
- Each histogram ROI 302a to 302c includes a plurality of target tissues arranged two-dimensionally.
- the size and number of the elastic characteristics ROI302 are determined by the operator using the input unit 600 (for example, the control port). Control panel) and set the height (height), width (width), and number.
- the input unit 600 may be prepared with several kinds of sample values for several heights “widths” so that the size can be easily set.
- the operator can set the elastic characteristic ROI 302 by selecting a desired value of the sample value force.
- the position of the elastic characteristic ROI 302 is determined by the operator operating the input unit 600 (for example, a trackball) and setting a desired position.
- the following input unit 600 (for example, a mouse) It can be set by setting the ROI by operating a pointing device such as ⁇ .
- the operator operates the mouse so that a mouse pointer (not shown) on the tomographic image display area 301 points to an arbitrary point (hereinafter referred to as a starting point).
- a mouse pointer (not shown) on the tomographic image display area 301 points to an arbitrary point (hereinafter referred to as a starting point).
- the operator moves the mouse pointer to any other point (hereinafter referred to as an end point) by dragging the mouse so that a desired ROI can be obtained.
- an end point (coordinates (X2, Y2)) pointed to by the mouse pointer, the position of the end point is fixed when the operator releases the mouse button.
- a value indicating the position of the rectangular area whose diagonal is the line between the start point and end point set in this way (such as coordinate information on the display 300), or a value indicating the range (length of the rectangular area in the horizontal direction) The length of the rectangular area in the vertical direction) is the area information.
- ROI is set by setting the area for measuring thickness variation, strain, elastic characteristics, etc. (Inertial characteristic ROI302) and setting the area for creating a histogram (Histogram ROI3 02a to 302c) Of at least twice.
- the region information of the elastic characteristics ROI 302 and the region information of the histograms ROI 302a to 302c are output to the ROI setting unit 107 as measurement region information and histogram region information.
- the ROI setting method that works in this embodiment is not limited to this example. For example, if the input unit 600 is a keyboard, the operator inputs the coordinates directly to the keyboard.
- the ROI may be set by
- the distribution creating unit 108 calculates the characteristic property values such as the thickness variation, strain, and elastic property of the target tissue included in the range indicated by the measurement region information set in the region setting unit 107, as a characteristic value calculation unit 105 Get from. For example, the distribution creating unit 108 obtains the frequency distribution of the elastic characteristics of a plurality of target tissues included in the range indicated by the histogram region information set in the region setting unit 107, and creates a histogram. It is preferable that the distribution creation unit 108 re-determines the frequency distribution and creates a new histogram every time the property calculation unit 105 updates the property property value in synchronization with the update cycle.
- the characteristic property values such as the thickness variation, strain, and elastic property of the target tissue included in the range indicated by the measurement region information set in the region setting unit 107
- the distribution creating unit 108 calculates the frequency distribution by summing up the elastic characteristics for each elastic characteristic level (for example, lOOmmHg). Create a histogram.
- the histogram is output to the display device 300 by the image processing unit 110.
- a histogram of the elastic characteristics of the target tissue included in a partial area of the outer membrane 41 set by the histogram ROI 302a is displayed.
- the elastic characteristics of the target tissues included in a part of the median 42 and the part of the intima 43 set by the histogram ROI302b and the histogram ROI302c A histogram of is displayed.
- the distribution creation unit 108 creates a histogram in the range indicated by the measurement area information at the same time that the motion information measurement unit 104 and the characteristic value calculation unit 105 perform the calculation. Accordingly, the histograms are displayed immediately in the histogram display areas 303a to 303c of the display device 300 almost simultaneously with the measurement.
- FIG. 5 shows the measurement of the elastic characteristics of the carotid vascular wall of a 36-year-old healthy male, and the creation of a histogram based on the measurement results.
- FIG. 5 (a) is a graph showing an example of a histogram of the elastic characteristics of the outer membrane region.
- Fig. 5 (b) is a graph showing an example of a histogram of the elastic properties of the media region.
- Fig. 5 (c) is a graph showing an example of a histogram of the elastic characteristics of the intima region.
- the horizontal axis represents the elastic properties (unit, mmHg)
- the vertical axis represents the frequency within the region.
- the histogram shown in Fig. 5 (a) is obtained by obtaining a frequency distribution for the elastic modulus of the target tissue located in the histogram ROI 302a shown in Fig. 3.
- 12 target tissues are arranged in the direction of the thickness of the blood vessel wall and 50 target tissues are arranged in the direction of the blood vessel extending, and a total of 500 target tissues are included.
- the histogram shown in Fig. 5 (b) is obtained based on the elastic modulus of the target tissue located in the histogram ROI302b.
- the histogram ROI302b In the histogram ROI302b, six target tissues are arranged in the direction of the blood vessel wall thickness and 50 in the direction in which the blood vessels extend, and a total of 300 target tissues are included.
- the histogram shown in Fig. 5 (c) is obtained based on the elastic modulus of the target tissue located in the histogram ROI302c.
- three target tissues are arranged in the direction of the vessel wall thickness and 50 in the direction of the blood vessel extension, and a total of 150 target tissues are included.
- the outer membrane 41, the middle membrane 42, and the inner membrane 43 are shown with the correct thicknesses. For this reason, histograms ROI 302a to 302c are also schematically shown!
- FIG. 5 (a) shows that the frequency of elastic properties in the range of 150 mmHg to 550 mmHg is high. This indicates that most of the tissue in the outer membrane region defined by the histogram ROI 302a has elastic characteristics in this range.
- Fig. 5 (b) shows that the structure of the medial region defined by the histogram ROI302b has a habit characteristic in the range of 150 mmHg to 250 mmHg.
- FIG. 5 (c) shows that the tissue of the intima has an elastic property in the range of approximately 50 mmHg to 750 mmHg. It can also be seen that there is a structure with an elastic property of lOOOmmHg or more. This high-value elastic property is far from the main elastic property distribution with a range of 50 mmHg force 750 mmHg, and there is a tissue with a specifically high elastic modulus in the region set by the intima histogram ROI302C. I can tell you.
- FIG. 6 shows, for comparison, one histogram ROI that includes the histograms ROI302a to ROI302c using the ultrasonic diagnostic apparatus 100, and the frequency of the characteristic of the target tissue within the set region.
- An example is shown in which a distribution is obtained and a histogram is created.
- the set histogram ROI includes the outer membrane, the media and the inner membrane of the blood vessel wall.
- the histogram in Fig. 6 shows that there is a tissue with elastic properties exceeding lOOOmmHg. From the distribution of force elastic properties, the existence of such highly elastic tissue is specific. Size It's hard to refuse.
- the histograms of the elastic properties are different, and when the elastic properties of the blood vessel wall are obtained and the degree of hardening is diagnosed, it is determined for each constituent tissue. Creating a histogram is considered to be extremely effective for accurate pathological diagnosis.
- one histogram need not be created for the histogram ROI.
- the distribution creation unit 108 acquires the elastic characteristic, thickness change amount, and distortion in the histogram ROI 302a, and displays the inertia characteristic histogram and thickness change amount. You can create histograms and distortion histograms and display them in the histogram display areas 303a to 303c! /.
- the region setting unit 107 acquires region information of the ROI set by the operator, and the distribution creation unit 108 is obtained by the region information and characteristic value calculation unit 105.
- the elastic properties create a histogram showing the frequency of elastic properties in the set ROI. This shows the frequency distribution of the elastic characteristics in the area set in the subject, so it is easy to determine the value of the elastic characteristic force S in the area to be diagnosed by the operator or the subject to be diagnosed. Can be recognized.
- the operator sets the ROI for each constituent tissue of the subject, the operator can refer to the histogram of elastic characteristics for each constituent tissue.
- the operator can accurately grasp the degree of hardening of the subject by referring to the elastic characteristics for each constituent tissue of the subject, and can perform more accurate pathological diagnosis.
- the calculation data is obtained by the characteristic value calculation unit 105, and at the same time, the distribution data generation unit 108 generates a histogram of the calculation data force. The degree of cure can be immediately grasped, and a more accurate diagnosis can be made.
- the histogram of the blood vessel wall 4 is created separately for the outer membrane 41, the middle membrane 42, and the inner membrane 43, but the inner membrane and the inner membrane are combined with the inner membrane. Since it is often used as a region (IMC region: In tima-media complex), the blood vessel wall 4 may be composed of the outer membrane 41 and the IMC region, and a histogram may be created! /.
- the property characteristic value obtained by the characteristic value calculation unit 105 is a histogram or the like.
- a two-dimensional distribution image in which the property characteristic value is indicated by the position in the subject may be further generated and displayed.
- the image processing unit 110 is based on the elastic characteristic received from the characteristic calculating unit 105 and the region information of the elastic characteristic ROI 302 received from the region setting unit 107. Create a two-dimensional distribution image of the elastic characteristics of the target tissue included in the elastic characteristic ROI 302, and display the two-dimensional distribution image 304 of the elastic characteristics on the tomographic image display area 301 on the display 300. .
- the image processing unit 110 since the elastic characteristics are updated for each cardiac cycle, it is preferable that the image processing unit 110 also updates the two-dimensional distribution image for each cardiac cycle using the updated elastic characteristics. As a result, the elastic property histogram and the two-dimensional distribution image are updated in synchronization with each cardiac cycle.
- the histogram ROI may be automatically determined. By doing so, it is possible to display a two-dimensional distribution image of the elastic characteristic and a histogram of the elastic characteristic without the operator specifying a region where the frequency distribution of the elastic characteristic is desired.
- the present embodiment is the same as the ultrasonic diagnostic apparatus according to the first embodiment except for the method of setting the ROI in the region setting unit 107.
- FIG. 4 is an explanatory diagram showing an example of a display mode of the display of the ultrasonic diagnostic apparatus according to the present embodiment.
- the same elements as those in the display mode of the display 300 according to the first embodiment are denoted by the same reference numerals as those in FIG. 3, and the description thereof is omitted.
- the ultrasonic diagnostic apparatus of the present embodiment has a tomographic image display area on the display 300.
- An area 301, an elastic characteristic ROI 302, and histogram display areas 303a and 303d are displayed.
- the blood vessel wall 4 of the blood vessel 3 as a subject is displayed in B mode.
- the blood vessel wall 4 is composed of an IMC region 44 composed of a media and an intima and an outer membrane 41.
- the operator can specify the ROI by setting a boundary in the elastic characteristic ROI 302 displayed on the display device 300.
- the elastic property ROI 302 is divided into two or more, and each becomes a histogram ROI for creating a histogram individually.
- the histogram ROI may be defined by the area between the two boundaries.
- a region sandwiched between the boundary 302d and the boundary 302e (a part of the outer membrane 41 of the blood vessel wall 4) is designated as one ROI, and the boundary 302e and the boundary 302f The sandwiched area (part of IMC area 44 of vessel wall 4) is designated as another ROI.
- the ROI set at the boundaries 302d to 302f is displayed in real time in the tomographic image display area 301.
- the size, position, and number of ROIs are determined by the boundaries 302d to 302f and the elastic characteristics ROI302. Therefore, the ROI information may not be displayed on the display 300.
- the operator sets the boundary 302d by operating the input unit 600 (for example, a pointing device such as a mouse). For example, the operator operates the mouse so that the mouse pointer on the tomographic image display area 301 points to an arbitrary point (hereinafter, point A).
- point A an arbitrary point
- the operator clicks the mouse at a point A indicated by the mouse pointer a boundary 302d having a length substantially the same as the horizontal length of the elastic characteristic ROI302 is displayed.
- the boundaries 302e and 302f are similarly set.
- the operator can change the positions of the boundaries 302d to 302f by dragging the boundaries 302d to 302f.
- a value indicating the position of an area sandwiched between two boundaries (such as coordinate information on the display 300) and a value indicating a range (the length of the rectangular area in the horizontal direction, the length of the rectangular area in the vertical direction) )
- region information As region information.
- the area information set by the boundaries 302d to 302f is output to the area setting unit 107 as histogram area information.
- the ROI setting method is not limited to this example.
- the input unit 600 is a keyboard
- the operator may set the ROI by directly inputting the coordinates to the keyboard.
- a pointing device such as a mouse may be used as the input unit 600, and the operator may freely operate the mouse while visually observing in the tomographic image display area 301, and use the mouse locus as a boundary. As a result, even when the boundary is complex, it can be handled.
- the boundary may be automatically set by the ultrasonic diagnostic apparatus.
- tissues contained in a subject have different acoustic characteristics. For this reason, there is a characteristic difference due to this acoustic characteristic difference in the received signal obtained by receiving the reflected echo.
- the intensity of the received signal that is, the amplitude information
- the boundary can be automatically set based on the amplitude information of the received signal.
- the image processing unit 110 creates image data such as a tomographic image of the subject from the received signal. This image data is obtained by amplifying the amplitude of the received signal with a mouth amplifier, and its intensity is characteristic for each tissue or at different tissue boundaries. Therefore, the region setting unit 107 receives image data such as a tomographic image generated by the image processing unit 110, and can determine the boundary based on the difference in amplitude in the image data.
- a difference in property characteristic values such as a maximum thickness change amount, strain, and elastic characteristics may be recognized as a subject boundary. Since the property value is also characteristic for each tissue, as is the amplitude of the received signal, the region setting unit 107 automatically detects the tissue boundary by recognizing the difference in the maximum thickness variation, strain, and elastic properties. can do.
- a difference in motion information such as a positional displacement amount and a thickness change amount of the subject may be recognized as the subject boundary. Since the motion information is also characteristic for each tissue, the region setting unit 107 can automatically detect the tissue boundary by recognizing the difference in the maximum thickness variation, strain, and elastic characteristics.
- the arterial blood vessel wall has been described as the subject.
- Samples that can be measured with an ultrasound diagnostic device are not limited to this example.
- the ultrasonic diagnostic apparatus of the present invention can be suitably used for measurement and diagnosis of other tissues such as the heart, liver, and stomach, and as described above, pathological diagnosis based on property characteristic values such as elastic characteristics. It can be performed.
- the freeze function is used to set the ROI offline. After setting, the histogram within ROI may be displayed.
- the region for which the histogram is to be obtained may be set directly on the tomographic image display region 301.
- the ultrasonic diagnostic apparatus of the present invention is suitable for measuring property characteristic values such as elastic characteristics of a subject, diagnosing the pathology, and analyzing characteristics of a tissue contained in the subject. Used for
Abstract
Description
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JP2006542990A JP4667392B2 (ja) | 2004-10-19 | 2005-10-18 | 超音波診断装置 |
US11/577,075 US7666141B2 (en) | 2004-10-19 | 2005-10-18 | Ultrasonic diagnostic apparatus |
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Cited By (4)
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EP2014237A1 (en) * | 2006-04-18 | 2009-01-14 | Panasonic Corporation | Ultrasonograph |
EP2030573A1 (en) * | 2006-06-06 | 2009-03-04 | Hitachi Medical Corporation | Ultrasonographic device |
JP5303147B2 (ja) * | 2005-10-19 | 2013-10-02 | 株式会社日立メディコ | 弾性画像を生成する超音波診断装置 |
JP2015024132A (ja) * | 2013-06-18 | 2015-02-05 | コニカミノルタ株式会社 | 超音波診断装置、超音波診断方法、および、プログラム |
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JPWO2007080870A1 (ja) * | 2006-01-11 | 2009-06-11 | パナソニック株式会社 | 超音波診断装置 |
JP4890554B2 (ja) * | 2006-08-21 | 2012-03-07 | 国立大学法人東北大学 | 超音波診断装置 |
JP5230106B2 (ja) * | 2007-01-15 | 2013-07-10 | 富士フイルム株式会社 | 超音波診断装置、imt計測方法及びimt計測プログラム |
JP5346440B2 (ja) * | 2007-02-15 | 2013-11-20 | 富士フイルム株式会社 | 超音波診断装置及びデータ計測プログラム |
FR2938957B1 (fr) * | 2008-11-21 | 2011-01-21 | Univ Joseph Fourier Grenoble I | Procede de traitement d'image pour l'estimation d'un risque de rupture de plaque d'atherome |
US9307980B2 (en) * | 2010-01-22 | 2016-04-12 | 4Tech Inc. | Tricuspid valve repair using tension |
JP7236312B2 (ja) * | 2019-04-04 | 2023-03-09 | 富士フイルムヘルスケア株式会社 | 超音波診断装置、信号処理装置、および、プログラム |
KR20210093049A (ko) * | 2020-01-17 | 2021-07-27 | 삼성메디슨 주식회사 | 초음파 진단 장치 및 그 동작방법 |
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JP5303147B2 (ja) * | 2005-10-19 | 2013-10-02 | 株式会社日立メディコ | 弾性画像を生成する超音波診断装置 |
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EP2014237A4 (en) * | 2006-04-18 | 2010-01-20 | Panasonic Corp | ULTRASOUND |
US8172754B2 (en) | 2006-04-18 | 2012-05-08 | Panasonic Corporation | Ultrasonograph |
EP2030573A1 (en) * | 2006-06-06 | 2009-03-04 | Hitachi Medical Corporation | Ultrasonographic device |
JP5038304B2 (ja) * | 2006-06-06 | 2012-10-03 | 株式会社日立メディコ | 超音波診断装置 |
EP2030573A4 (en) * | 2006-06-06 | 2013-02-27 | Hitachi Medical Corp | ULTRASOUND DEVICE |
JP2015024132A (ja) * | 2013-06-18 | 2015-02-05 | コニカミノルタ株式会社 | 超音波診断装置、超音波診断方法、および、プログラム |
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US20090024032A1 (en) | 2009-01-22 |
JPWO2006043529A1 (ja) | 2008-05-22 |
JP4667392B2 (ja) | 2011-04-13 |
US7666141B2 (en) | 2010-02-23 |
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