WO2016031273A1 - 超音波観測装置、超音波観測システム、超音波観測装置の作動方法 - Google Patents
超音波観測装置、超音波観測システム、超音波観測装置の作動方法 Download PDFInfo
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- WO2016031273A1 WO2016031273A1 PCT/JP2015/057196 JP2015057196W WO2016031273A1 WO 2016031273 A1 WO2016031273 A1 WO 2016031273A1 JP 2015057196 W JP2015057196 W JP 2015057196W WO 2016031273 A1 WO2016031273 A1 WO 2016031273A1
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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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- 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
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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
- A61B8/12—Diagnosis using ultrasonic, sonic or infrasonic waves in body cavities or body tracts, e.g. by using catheters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4444—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device related to the probe
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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
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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
- A61B8/5207—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves involving processing of raw data to produce diagnostic data, e.g. for generating an image
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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
- A61B8/42—Details of probe positioning or probe attachment to the patient
- A61B8/4272—Details of probe positioning or probe attachment to the patient involving the acoustic interface between the transducer and the tissue
- A61B8/429—Details of probe positioning or probe attachment to the patient involving the acoustic interface between the transducer and the tissue characterised by determining or monitoring the contact between the transducer and the tissue
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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
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4483—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer
- A61B8/4494—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer characterised by the arrangement of the transducer elements
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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
Definitions
- the present invention relates to an ultrasonic observation apparatus, an ultrasonic observation system, and an operation method of an ultrasonic observation apparatus that generate an image including an elastic image based on an ultrasonic signal obtained by transmitting and receiving ultrasonic waves.
- a series of images acquired by such an ultrasonic observation apparatus is temporarily stored in an image memory or the like. Then, the user selects an appropriate image as an image for calculating elasticity information or an image for saving medical charts from a series of images stored in the image memory.
- an area where the amount of distortion in the image is larger than a predetermined threshold may be colored and displayed.
- all the frame images are colored. Not necessarily. Therefore, when a user selects an appropriate image, it is necessary to search not only a frame image with a color added but also a frame image without a color, and it takes a lot of time to select an appropriate image. .
- WO2011 / 010626 discloses a technique for automatically extracting an appropriate image based on a compression state on a living body.
- References used for extraction in this publication include an average value of displacement, an average value of elasticity information, a displacement of pressure, a variation in pressure in the beam line direction, and the like.
- Japanese Patent Application Laid-Open No. 2012-213545 discloses that elastic volume data composed of a plurality of two-dimensional elastic images including a noise image is determined as a noise volume in order to provide a high-quality three-dimensional elastic image.
- An ultrasonic diagnostic apparatus that does not display a three-dimensional elastic image based on elastic volume data determined to be a noise volume is described.
- Japanese Patent Application Laid-Open No. 2005-118152 discloses various data (pressure data, displacement frame data, etc.) used in the process of generating a strain elastic image (elastic frame data) in order to provide a high-quality elastic image. Evaluate the value of image display for each measurement point in the region of interest (ROI) based on elastic frame data), identify useless information and useful information, and finally leave the useless information as an image It describes a technique that prevents it from being masked.
- ROI region of interest
- the present invention has been made in view of the above circumstances, and an ultrasonic observation apparatus, an ultrasonic observation system, and an operation method of the ultrasonic observation apparatus that can automatically extract an appropriate image without depending on the ROI size. It is intended to provide.
- An ultrasonic observation apparatus is an ultrasonic observation apparatus that generates an ultrasonic image based on an ultrasonic signal generated from an ultrasonic wave transmitted and reflected to a subject.
- a transmission unit that transmits a drive signal for generating the ultrasonic wave to be transmitted, a reception unit that receives the ultrasonic signal generated from the ultrasonic wave reflected by the subject, and the reception unit
- a displacement measuring unit that measures the displacement of the subject based on the ultrasonic signal
- an elastic image generating unit that generates an elastic image based on the displacement measured by the displacement measuring unit
- the elastic image generating unit A storage unit that stores one or more elastic images, and an appropriate image determination region for determining an appropriate image from the one or more elastic images stored in the storage unit are ROIs that are regions of interest.
- a proper image determination unit for determining whether or not.
- the ultrasonic observation system receives the drive signal from the ultrasonic observation apparatus and the transmission unit, transmits the ultrasonic wave to the subject, and reflects the ultrasonic wave reflected by the subject.
- An ultrasonic probe that receives a sound wave, generates the ultrasonic signal, and transmits the ultrasonic signal to the receiving unit.
- An operation method of an ultrasonic observation apparatus is an operation method of an ultrasonic observation apparatus that generates an ultrasonic image based on an ultrasonic signal generated from an ultrasonic wave transmitted to a subject and reflected.
- a transmitting unit transmitting a drive signal for generating the ultrasonic wave to be transmitted to the subject; and a receiving unit transmitting the ultrasonic signal generated from the ultrasonic wave reflected by the subject ,
- a step in which the displacement measuring unit measures the displacement of the subject based on the ultrasonic signal received by the receiving unit, and an elastic image generating unit is based on the displacement measured by the displacement measuring unit.
- Generating an elastic image a storage unit storing one or more elastic images generated by the elastic image generation unit, and a determination region setting unit stored in the storage unit. More than A step of setting an appropriate image determination region for determining an appropriate image from the elastic image according to the size of the ROI that is the region of interest, and a characteristic calculation unit calculating the region characteristic of the appropriate image determination region And a step of determining whether or not the elastic image in which the appropriate image determination area is set is an appropriate image based on the area characteristics.
- FIG. 1 is a block diagram showing a configuration of an ultrasound observation system in Embodiment 1 of the present invention.
- region where the distortion amount in ROI is more than predetermined value is displayed in the said Embodiment 1.
- FIG. The figure which shows the example of the position of the displacement source with respect to ROI in the said Embodiment 1.
- FIG. In the said Embodiment 1, the figure which shows the example of the appropriate image determination area
- FIG. 4 is a diagram illustrating an example of a first position when an appropriate image determination area is sequentially scanned in the ROI according to the first embodiment.
- FIG. 6 is a diagram illustrating an example of a second position when an appropriate image determination region is sequentially scanned in the ROI according to the first embodiment.
- FIG. The figure which shows the example which carries out fixed value division
- FIG. The figure which shows the 1st division example at the time of carrying out variable value division
- FIG. 5 is a flowchart showing elasticity image extraction processing in the ultrasonic observation system of the first embodiment. 5 is a flowchart showing single area processing in the first embodiment. 3 is a flowchart showing a sequential scan process in the first embodiment. 5 is a flowchart showing fixed value division processing in the first embodiment. The flowchart which shows the fluctuation value division
- FIG. 1 is a block diagram showing the configuration of an ultrasonic observation system.
- This ultrasonic observation system generates an ultrasonic image based on an intracorporeal probe 2 that transmits ultrasonic waves to a subject and receives ultrasonic waves reflected by the subject, and an ultrasonic signal obtained from the received ultrasonic waves. And an ultrasonic observation apparatus 1 that performs the operation.
- the body cavity probe 2 is an ultrasound probe to be used by being inserted into a body cavity, and includes an ultrasound transducer configured by arranging a large number of vibration elements, from the ultrasound transmission / reception surface of the ultrasound transducer. An ultrasonic wave is transmitted to the subject, the ultrasonic wave reflected by the subject is received by the ultrasonic wave transmitting / receiving surface of the ultrasonic transducer, and an ultrasonic signal is generated from the received ultrasonic wave.
- the body cavity probe 2 is configured as a convex type ultrasonic probe, a radial type ultrasonic probe, or the like.
- the ultrasonic observation apparatus 1 includes a transmission unit 11, a transmission / reception switching unit 14, a reception unit 15, a phasing addition unit 16, a signal processing unit 17, a displacement measurement unit 21, an elastic image generation unit 22, and a memory.
- the transmission unit 11 transmits a drive signal for generating an ultrasonic wave to be transmitted to the subject, and includes a transmission waveform generation unit 12 and a transmission delay unit 13.
- the transmission waveform generator 12 generates a signal waveform for driving each vibration element constituting the ultrasonic transducer and outputs it as a drive signal.
- the transmission delay unit 13 adjusts the drive timing of each vibration element constituting the ultrasonic transducer by delaying the drive signal generated by the transmission waveform generation unit 12. Thereby, the focus and direction of the ultrasonic beam transmitted from the ultrasonic transducer are controlled, and the ultrasonic wave can be converged to a desired position (depth).
- the transmission / reception switching unit 14 includes, for example, a multiplexer that sequentially selects a plurality of vibration elements for performing transmission / reception of ultrasonic waves, and transmits a drive signal from the transmission unit 11 to the ultrasonic transducer.
- the ultrasonic signal (echo signal) from is transmitted to the receiving unit 15.
- the receiving unit 15 receives the ultrasonic signal from the transmission / reception switching unit 14 and performs processing such as amplification and conversion to a digital signal, for example.
- the phasing adder 16 delays the ultrasonic signal and adds the signals after matching the phases.
- the signal processing unit 17 performs coordinate conversion and interpolation processing on the ultrasonic signal from the phasing addition unit 16 to create an ultrasonic image as a display image.
- the displacement measurement unit 21 measures the displacement of the subject based on the ultrasonic signal from the phasing addition unit 16.
- the elastic image generation unit 22 includes a strain calculation unit 23. Based on the displacement measured by the displacement measuring unit 21, the strain calculating unit 23 calculates a strain amount of a region of interest (ROI: Region of interest) for elastic image display (see ROI 34 in FIGS. 2 to 12). Then, the elastic image generation unit 22 calculates the elastic modulus of the subject based on the strain amount calculated by the strain calculation unit 23. Since the elastic image generation unit 22 calculates the elastic modulus for each coordinate of the subject, the calculation result is an elastic image in which the elastic modulus is distributed on two-dimensional coordinates. The elastic image generation unit 22 generates the elastic image for each frame, for example, and generates one or more elastic images. The elastic image generation unit 22 further calculates the distortion amount of the ROI 34 based on the displacement measured by the displacement measurement unit 21, and colors the pixels of the elastic image in which the distortion amount is a predetermined value or more.
- ROI Region of interest
- the memory unit 24 is a storage unit that temporarily stores one or more elastic images generated by the elastic image generating unit 22.
- the determination area setting unit 25 sets an appropriate image determination area 37 (see FIGS. 4 to 12 and the like) for determining an appropriate image from one or more elastic images stored in the memory unit 24, and the size of the ROI 34. Set according to.
- the characteristic calculation unit 26 calculates the region characteristics of the appropriate image determination region 37 set by the determination region setting unit 25. Specifically, the characteristic calculation unit 26 is calculated by, for example, the average value of the displacement of the appropriate image determination region 37 measured by the displacement measurement unit 21, the variance of the displacement, the deviation of the displacement, and the elastic image generation unit 22. At least one of the average value of the elasticity information of the appropriate image determination area 37, the dispersion of the elasticity information, and the deviation of the elasticity information is calculated as the area characteristic.
- the characteristic calculation unit 26 also includes the number of colored pixels in the appropriate image determination area 37, the total area of the colored pixels, the ratio of the number of colored pixels to the total number of pixels in the appropriate image determination area 37, and the entire appropriate image determination area 37. At least one of the ratio of the total area of the colored pixels to the area may be calculated as the region characteristic.
- the body cavity probe 2 which is an ultrasonic probe is further provided with a pressure detection unit for detecting the pressure of the ultrasonic transmission / reception surface that transmits and receives ultrasonic waves, and the characteristic calculation unit 26 displays the detection result of the pressure detection unit. At least one of the average value of pressure, the rate of change of pressure, the dispersion of pressure, and the deviation of pressure in the appropriate image determination region 37 obtained based on the region characteristic is calculated. It doesn't matter.
- the proper image determination unit 27 determines whether the proper image determination region 37 is a proper region based on the region characteristics calculated by the property calculation unit 26. Furthermore, the appropriate image determination unit 27 causes the determination region setting unit 25 to reset the appropriate image determination region 37 as necessary when it is not the appropriate region. Thus, when at least one of the appropriate image determination areas 37 set in the ROI 34 of the elastic image is an appropriate area, the appropriate image determination unit 27 determines that the elastic image in which the appropriate image determination area 37 is set is an appropriate image. It comes to judge.
- the image display unit 31 includes a display device such as a monitor, and displays a display image from the signal processing unit 17. That is, the image display unit 31 displays an ultrasonic image in the ultrasonic diagnostic mode. In the elastic image observation mode, the image display unit 31 displays the elastic image from the elastic image generation unit 22 or displays the elastic image superimposed on the ultrasonic image. Here, when displaying an elastic image, the image display unit 31 further displays an appropriate image determination region 37 from the appropriate image determination unit 27 superimposed on the elastic image as necessary.
- FIG. 2 is a diagram showing a state where an area where the amount of distortion in the ROI 34 is equal to or greater than a predetermined value is displayed, and FIG.
- a probe image 33 showing the position of the body cavity probe 2 itself as an image and an ROI 34 for elastic image display are displayed.
- the in-body cavity probe 2 shown as the probe image 33 in FIG. 2 has a radius of curvature R of, for example, 10 mm or less, and the radius of curvature R is relatively small.
- the ROI 34 is assumed to have a central angle of approximately 180 °, for example.
- an area 35 composed of pixels having a distortion amount equal to or larger than a predetermined value is displayed as shown in FIG. 2, for example.
- This area 35 is generated as an image colored in a specific color, for example, by the elastic image generation unit 22 and displayed on the image display unit 31 so that it can be easily distinguished from other parts. Therefore, in the example shown in FIG. 2, a colored area and an uncolored area exist in the ROI 34 of the elastic image.
- the ultrasonic probe is the body cavity probe 2 that is used by being inserted into the body cavity
- displacement of the living body due to pulsation or pulsation is used to generate an elastic image.
- a displacement source 36 such as a pulsation source or a pulsation source
- the strain amount becomes a predetermined value or more by receiving an appropriate pressure in the ROI 34 in the region shown in FIG. No. 35, and a distortion amount greater than a predetermined value does not occur in other regions.
- the radius of curvature R of the body cavity probe 2 is small or the center angle of the ROI 34 is wide, it is not expected that the entire ROI 34 is displayed in color.
- the image shown in FIG. 2 should be determined to be a proper image. Therefore, in the present embodiment, as will be described below, an area for determining an appropriate image is set according to the size of the elastic image display ROI 34, and the area characteristics in the set area are calculated. Whether or not the image is appropriate is determined according to the calculated characteristics.
- FIG. 13 is a flowchart showing an elastic image extraction process in the ultrasonic observation system.
- an ultrasonic signal is transmitted from the transmitter 11 to the body cavity probe 2.
- ultrasonic waves are transmitted from the body cavity probe 2 toward the subject.
- the body cavity probe 2 receives the ultrasonic wave reflected by the subject, generates an ultrasonic signal (echo signal), and transmits it to the ultrasonic observation apparatus.
- an ultrasonic signal (echo signal) is received by the reception unit 15 via the transmission / reception switching unit 14 and processed by the phasing addition unit 16 and the displacement measurement unit 21.
- the strain amount of the ROI 34 is calculated for each coordinate position, and the elastic image generation unit 22 generates an elastic image based on the calculated strain amount.
- Such an elastic image is acquired in units of frames, for example, thereby acquiring one or more elastic images (step S1).
- the one or more elastic images acquired in this way are stored in the memory unit 24 (step S2).
- the first elastic image is selected from the elastic images stored in the memory unit 24 (step S3).
- the size of the ROI 34 of the selected elasticity image (the size of this ROI 34 can be set by the user, for example, is set to a predetermined size when there is no user setting) is equal to or smaller than a predetermined threshold value.
- the determination area setting unit 25 determines whether or not the central angle of the ROI 34 is equal to or smaller than a predetermined threshold value.
- the threshold value used for the determination may be appropriately determined according to the size of the displacement source 36 and the like.
- FIG. 4 is a diagram illustrating an example of the appropriate image determination region 37 set when the central angle of the ROI 34 is larger than a predetermined threshold value
- FIG. 5 is a case where the central angle of the ROI 34 is equal to or smaller than the predetermined threshold value. It is a figure which shows the example of the appropriate image determination area
- step S5 single region processing is performed (step S5).
- This single area process is a process for setting the entire ROI 34 in the appropriate image determination area 37, as will be described later with reference to FIG.
- step S4 determines that the central angle of the ROI 34 is larger than the predetermined threshold, a part of the ROI 34 will be described later as described in step S7, step S9, or step S10. Is set as the appropriate image determination area 37.
- the threshold value is 60 °
- the center angle of the ROI 34 is about 180 ° (that is, larger than 60 °) as shown in FIG.
- the center angle of the ROI 34 is about 30 ° (that is, 60 ° or less) as shown in FIG. 5
- the entire ROI 34 is set as the appropriate image determination region 37.
- step S4 If it is determined in step S4 that the central angle of the ROI 34 is larger than the predetermined threshold value, it is further determined whether or not the setting for sequentially scanning the partial areas is made (step S6).
- step S7 sequential scanning processing is performed.
- the determination area setting unit 25 offsets the partial area from the reference position by an offset amount so that the entire ROI 34 is covered with the partial area at all moving positions. This is a process of sequentially moving and setting each of the partial areas at each movement position as the appropriate image determination area 37.
- step S6 If it is determined in step S6 that the sequential scan is not set, it is determined whether or not the fixed value division of the partial area is set (step S8).
- step S9 when it is determined that fixed value division is set, fixed value division processing is performed (step S9).
- the determination area setting unit 25 divides the entire ROI 34 into a plurality of partial areas, and each of the partial areas is converted into the appropriate image determination area 37. This is a process of setting, and is a process of setting the number of divisions into the partial area of the entire ROI 34 based on a fixed value.
- variable value division processing is performed (step S10).
- the determination region setting unit 25 divides the entire ROI 34 into a plurality of partial regions, and each of the partial regions is converted into an appropriate image determination region 37.
- An appropriate image that is determined to be an appropriate area by the appropriate image determination unit 27, which is a process of setting, and changes the number of divisions of the entire ROI 34 into a partial area between a lower limit value and an upper limit value This process is performed until the determination area 37 is found.
- step S11 it is determined whether there is another unprocessed elastic image in the memory unit 24 (step S11).
- step S12 If it is determined that there is another elastic image, the next elastic image is selected from the unprocessed elastic images (step S12) to step S4, and the above-described processing is repeated. Do it.
- step S11 If it is determined in step S11 that there is no unprocessed elastic image, the elastic image stored in the memory unit 24 based on the processing result of step S5, step S7, step S9, or step S10. It is determined whether or not a proper image exists in the image (step S13).
- step S13 if it is determined that a proper image is present, all the proper images are extracted and displayed on, for example, the image display unit 31 (step S14), and then it is determined that there is no proper image. If this is the case, the process returns from the elastic image extraction process to a main process (not shown).
- FIG. 14 is a flowchart showing single area processing.
- step S5 in FIG. 13 the entire elastic image display ROI 34 is set in the appropriate image determination area 37 as described above with reference to FIG. 5 (step S21).
- step S22 the area characteristic of the appropriate image determination area 37 is calculated (step S22), and it is determined based on the calculated area characteristic whether the set appropriate image determination area 37 is an appropriate area (step S23). Then, the process returns to the process shown in FIG.
- FIG. 15 is a flowchart showing the sequential scanning process.
- step S7 of FIG. 13 When entering this process in step S7 of FIG. 13, first, the appropriate image determination area 37 having a predetermined angle (for example, 60 °, which is the same as the threshold value in step S4) is set as a reference in the elastic image display ROI 34. The position is set (step S31).
- a predetermined angle for example, 60 °, which is the same as the threshold value in step S4
- step S32 the area characteristic of the appropriate image determination area 37 is calculated (step S32), and based on the calculated area characteristic, it is determined whether or not the set appropriate image determination area 37 is an appropriate area (step S33).
- step S34 it is determined whether or not there is an area in the ROI 34 that has not yet been determined whether or not it is an appropriate area (step S34), and if it is determined that there is an undetermined area,
- the appropriate image determination area 37 is moved by a predetermined offset amount (for example, an offset angle of 30 °) to set a new appropriate image determination area 37 (step S35), and the process returns to step S32 to perform the above-described processing.
- a predetermined offset amount for example, an offset angle of 30 °
- FIGS. 6 to 8 sequential scanning is performed in which the appropriate image determination area 37 sequentially moves within the ROI 34, for example, by 30 °.
- 6 is a diagram showing an example of the first position when the appropriate image determination area 37 is sequentially scanned in the ROI 34.
- FIG. 7 is a diagram showing the second position when the appropriate image determination area 37 is sequentially scanned in the ROI 34.
- FIG. 8 is a diagram illustrating an example, and FIG. 8 is a diagram illustrating an example of a third position when the appropriate image determination region 37 is sequentially scanned in the ROI 34.
- FIG. 16 is a flowchart showing the fixed value dividing process.
- the elastic image display ROI 34 is divided into partial regions based on the fixed values (step S41).
- the fixed value is, for example, the size of the partial area (angle of the partial area) or the number of divisions.
- the fixed value is set to the partial region angle 60 °.
- the entire ROI 34 is divided into three partial areas as shown in FIG. 9, and each partial area is divided into the first to third appropriate image determination areas 37a.
- FIG. 9 is a diagram illustrating an example in which the proper image determination area is divided into fixed values in the ROI 34.
- the angle of the partial region is a fixed value
- the number of divisions differs according to the central angle ⁇ of the ROI 34 (for example, when the central angle ⁇ is 120 °, the number of divisions is two).
- the ROI 34 is divided into three partial areas as shown in FIG. 9 (equal division as a preferable division example) as described above.
- the number of divisions may be given as a fixed value corresponding to the size of the central angle ⁇ of the ROI 34.
- the fixed value is 2 when the central angle ⁇ is 60 ° ⁇ ⁇ 120 °, and the fixed value is 3 when 120 ° ⁇ ⁇ 180 °.
- the first partial area of the divided partial areas is set as the appropriate image determination area 37 (for example, the first appropriate image determination area 37a) (step S42), and the area of the appropriate image determination area 37 is set.
- the characteristic is calculated (step S43), and based on the calculated area characteristic, it is determined whether or not the set appropriate image determination area 37 is an appropriate area (step S44).
- step S45 it is determined whether or not there is an unprocessed partial area (partial area that has not been determined whether or not it is an appropriate area) in the ROI 34 (step S45). If it is determined, the next partial area is set as a new appropriate image determination area 37 (step S46), and the process returns to step S43 to perform the above-described processing.
- step S45 when it is determined in step S45 that there is no unprocessed partial area, the process returns to the process shown in FIG.
- FIG. 17 is a flowchart showing the variable value dividing process.
- a lower limit value ni of the division number is set as an initial value to a variable n indicating the division number (step S51).
- the lower limit ni is, for example, 2 (when the number of divisions is 1, since the single area process of step S5 is performed, a preferred example of the lower limit is 2 here).
- the elastic image display ROI 34 is divided into n partial regions (equal division as a preferred division example) (step S52), and the first partial region among the divided partial regions is determined as an appropriate image.
- the area 37 is set (step S53).
- step S54 the area characteristic of the appropriate image determination area 37 is calculated (step S54), and it is determined based on the calculated area characteristic whether the set appropriate image determination area 37 is an appropriate area (step S55).
- step S56 whether or not the elastic image to be processed is an appropriate image is determined based on whether or not the appropriate image determination area 37 is determined as an appropriate area in step S55 (step S56).
- Step S57 If it is determined that the elasticity image to be processed is not an appropriate image, is there an unprocessed partial area (a partial area that has not yet been determined whether or not it is an appropriate area) in the ROI 34? (Step S57), if it is determined that there is an unprocessed partial area, the next partial area is set as a new appropriate image determination area 37 (step S58), and the process returns to step S54. The above processing is performed.
- step S57 if it is determined in step S57 that there is no unprocessed partial area, the variable n indicating the number of divisions is increased by 1 (step S59), and then is n greater than the upper limit value nf of the number of divisions? It is determined whether or not (step S60).
- n is equal to or less than the upper limit value nf of the number of divisions
- the process returns to step S52, and the processing based on the newly set number of divisions n is performed as described above.
- the number of appropriate image determination areas 37 is two (37a and 37b) shown in FIG. 10, three (37a to 37c) shown in FIG. 11, and shown in FIG.
- the variation value division which increases sequentially like four (37a-37d) is performed.
- FIG. 10 is a diagram illustrating a first division example when the appropriate image determination area 37 is divided into variable values in the ROI 34
- FIG. 11 is a second division when the appropriate image determination area 37 is divided into variable values in the ROI 34
- FIG. 12 is a diagram showing an example
- FIG. 12 is a diagram showing a third example of division when the appropriate image determination area 37 is divided into variable values in the ROI 34.
- step S60 If it is determined in step S60 that n is larger than the upper limit value nf, or if it is determined in step S56 that the elastic image to be processed is an appropriate image, the processing shown in FIG. Return to
- the division number n is changed from the lower limit value ni to the upper limit value nf.
- the division number n may be changed from the upper limit value nf to the lower limit value ni. It may be changed in an appropriate order between nf and less.
- the lower limit ni in step S51 and the upper limit nf in step S60 of FIG. 17 may be set automatically based on the design value, or may be set manually by the user. It doesn't matter.
- the determination area setting unit 25 or the appropriate image determination unit 27 or the like provides a table that gives a predetermined value according to the central angle of the ROI 34 in advance. Each value may be determined with reference to a table based on the size of the central angle of the ROI 34 set by the user or the like.
- step S5 the single region process in step S5, the sequential scan in step S7, the fixed value division in step S9, and the variable value division in step S10 are automatically set.
- the single region process in step S5 the sequential scan in step S7, the fixed value division in step S9, and the variable value division in step S10 are automatically set.
- the appropriate image determination unit 27 when it is determined that the appropriate image determination area 37 is the appropriate area, the appropriate image determination unit 27 further superimposes the area determined to be the appropriate area on the elastic image. It may be displayed on the display unit 31 and clearly shown to the user. In this case, the appropriate image determination unit 27 generates a signal for displaying the appropriate image determination region 37 determined to be appropriate so as to be superimposed on the elastic image, and transmits the signal to the image display unit 31.
- the intra-body cavity probe 2 has been described as an example.
- the present invention is not limited to this, and an extracorporeal ultrasonic probe may be used.
- an extracorporeal ultrasonic probe specifically a linear ultrasonic probe
- the threshold value to be compared with the size of the ROI 34 in step S4 in FIG. is not limited to this.
- the appropriate image determination area 37 is set according to the size of the ROI 34, and it is determined whether the elastic image is an appropriate image based on the area characteristics of the appropriate image determination area 37. As a result, an appropriate image can be automatically extracted regardless of the size of the ROI 34.
- the entire ROI 34 is set as the appropriate image determination area 37, and when it is larger than the threshold value, the partial area is set as the appropriate image determination area 37.
- An appropriate determination can be made according to the size of 36.
- variable value division it is possible to cope with a change in the size of the region receiving the pressure from the displacement source 36.
- the number of colored pixels in the appropriate image determination area 37 the total area of the colored pixels, the ratio of the number of colored pixels to the total number of pixels in the appropriate image determination area 37, and the number of colored pixels relative to the area of the entire appropriate image determination area 37
- appropriate determination using colored pixels can be performed.
- the appropriate image determination area 37 determined to be appropriate is displayed so as to be superimposed on the elastic image, the appropriate image determination area 37 from which the elastic image is determined to be an appropriate image is displayed. The user can easily confirm.
- the ultrasonic observation system mainly including the ultrasonic observation apparatus has been described.
- an operation method of operating the ultrasonic observation apparatus or the ultrasonic observation system as described above may be used, or an ultrasonic observation may be performed on a computer. It may be a processing program for operating the apparatus or the ultrasonic observation system as described above, a non-temporary recording medium readable by a computer for recording the processing program, or the like.
- the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage.
- various aspects of the invention can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, you may delete some components from all the components shown by embodiment.
- the constituent elements over different embodiments may be appropriately combined.
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Abstract
Description
図1から図17は本発明の実施形態1を示したものであり、図1は超音波観測システムの構成を示すブロック図である。
Claims (13)
- 被検体へ送信して反射された超音波から生成された超音波信号に基づき超音波画像を生成する超音波観測装置であって、
前記被検体へ送信する前記超音波を生成するための駆動信号を送信する送信部と、
前記被検体により反射された前記超音波から生成された前記超音波信号を受信する受信部と、
前記受信部で受信した前記超音波信号に基づき前記被検体の変位を計測する変位計測部と、
前記変位計測部で計測した変位に基づいて弾性画像を生成する弾性画像生成部と、
前記弾性画像生成部で生成された1つ以上の前記弾性画像を記憶する記憶部と、
前記記憶部に記憶された1つ以上の前記弾性画像の中から適正な画像を判定するための適正画像判定領域を、関心領域であるROIのサイズに応じて設定する判定領域設定部と、
前記適正画像判定領域の領域特性を算出する特性算出部と、
前記領域特性に基づいて前記適正画像判定領域が設定された前記弾性画像が適正な画像であるか否かを判定する適正画像判定部と、
を有することを特徴とする超音波観測装置。 - 前記判定領域設定部は、前記ROIのサイズが閾値以下である第1の場合には前記ROI全体を前記適正画像判定領域に設定し、前記ROIのサイズが前記閾値よりも大きい第2の場合には前記ROIの一部である部分領域を前記適正画像判定領域に設定することを特徴とする請求項1に記載の超音波観測装置。
- 前記判定領域設定部は、前記第2の場合には、全ての移動位置における前記部分領域によって前記ROI全体が覆われるように前記部分領域を基準位置からオフセット量ずつ順次移動させ、各移動位置における前記部分領域のそれぞれを前記適正画像判定領域に設定することを特徴とする請求項2に記載の超音波観測装置。
- 前記判定領域設定部は、前記第2の場合には、前記ROI全体を複数の前記部分領域に分割して、前記部分領域のそれぞれを前記適正画像判定領域に設定することを特徴とする請求項2に記載の超音波観測装置。
- 前記ROI全体の前記部分領域への分割数は、固定値に基づき設定されることを特徴とする請求項4に記載の超音波観測装置。
- 前記判定領域設定部は、前記ROI全体の前記部分領域への分割数を、下限値以上、上限値以下の間で変化させることを、前記適正画像判定部により適正な領域であると判定される適正画像判定領域が発見されるまで行うことを特徴とする請求項4に記載の超音波観測装置。
- 前記適正画像判定部は、前記領域特性に基づいて前記適正画像判定領域が適正であるか否かを判定し、1つ以上の前記適正画像判定領域が適正であると判定した場合に、前記適正画像判定領域を設定した前記弾性画像が適正な画像であると判定することを特徴とする請求項1に記載の超音波観測装置。
- 前記特性算出部は、前記変位計測部により計測された前記適正画像判定領域の変位の平均値と、前記変位の分散と、前記変位の偏差と、前記弾性画像生成部により算出された前記適正画像判定領域の弾性情報の平均値と、前記弾性情報の分散と、前記弾性情報の偏差と、の内の少なくとも1つを、前記領域特性として算出することを特徴とする請求項1に記載の超音波観測装置。
- 前記弾性画像生成部は、さらに、前記変位計測部で計測した変位に基づいて前記ROIの歪み量を計算し、前記歪み量が所定値以上となる前記弾性画像の画素に色付けを行い、
前記特性算出部は、前記適正画像判定領域の、色付き画素数と、前記色付き画素の合計面積と、前記適正画像判定領域全体の画素数に対する前記色付き画素数の割合と、前記適正画像判定領域全体の面積に対する前記色付き画素の合計面積の割合と、の内の少なくとも1つを、前記領域特性として算出することを特徴とする請求項1に記載の超音波観測装置。 - 前記適正画像判定部は、さらに、適正であると判定した前記適正画像判定領域を前記弾性画像に重畳して表示するための信号を生成することを特徴とする請求項1に記載の超音波観測装置。
- 請求項1に記載の超音波観測装置と、
前記送信部からの前記駆動信号を受けて前記超音波を前記被検体へ送信し、前記被検体により反射された前記超音波を受けて前記超音波信号を生成し前記受信部へ送信する超音波プローブと、
を有することを特徴とする超音波観測システム。 - 前記超音波プローブは、前記超音波を送受する超音波送受信面の圧力を検出するための圧力検出部をさらに備え、
前記特性算出部は、前記圧力検出部の検出結果に基づき得られた、前記適正画像判定領域の、圧力の平均値と、前記圧力の変化率と、前記圧力の分散と、前記圧力の偏差と、の内の少なくとも1つを、前記領域特性として算出することを特徴とする請求項11に記載の超音波観測システム。 - 被検体へ送信して反射された超音波から生成された超音波信号に基づき超音波画像を生成する超音波観測装置の作動方法であって、
送信部が、前記被検体へ送信する前記超音波を生成するための駆動信号を送信するステップと、
受信部が、前記被検体により反射された前記超音波から生成された前記超音波信号を受信するステップと、
変位計測部が、前記受信部で受信した前記超音波信号に基づき前記被検体の変位を計測するステップと、
弾性画像生成部が、前記変位計測部で計測した変位に基づいて弾性画像を生成するステップと、
記憶部が、前記弾性画像生成部で生成された1つ以上の前記弾性画像を記憶するステップと、
判定領域設定部が、前記記憶部に記憶された1つ以上の前記弾性画像の中から適正な画像を判定するための適正画像判定領域を、関心領域であるROIのサイズに応じて設定するステップと、
特性算出部が、前記適正画像判定領域の領域特性を算出するステップと、
適正画像判定部が、前記領域特性に基づいて前記適正画像判定領域が設定された前記弾性画像が適正な画像であるか否かを判定するステップと、
を有することを特徴とする超音波観測装置の作動方法。
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