WO2011001776A1 - Appareil de diagnostic ultrasonore et procédé de génération d'image par propagation d'ondes rotationnelles - Google Patents

Appareil de diagnostic ultrasonore et procédé de génération d'image par propagation d'ondes rotationnelles Download PDF

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Publication number
WO2011001776A1
WO2011001776A1 PCT/JP2010/059240 JP2010059240W WO2011001776A1 WO 2011001776 A1 WO2011001776 A1 WO 2011001776A1 JP 2010059240 W JP2010059240 W JP 2010059240W WO 2011001776 A1 WO2011001776 A1 WO 2011001776A1
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image
shear wave
ultrasonic
unit
propagation
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PCT/JP2010/059240
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English (en)
Japanese (ja)
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卓司 大坂
毅 三竹
直之 村山
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株式会社 日立メディコ
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Publication of WO2011001776A1 publication Critical patent/WO2011001776A1/fr

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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
    • 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
    • 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
    • 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
    • G01S7/52071—Multicolour displays; using colour coding; Optimising colour or information content in displays, e.g. parametric imaging
    • 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
    • G01S7/52074—Composite displays, e.g. split-screen displays; Combination of multiple images or of images and alphanumeric tabular information

Definitions

  • the present invention relates to an ultrasonic diagnostic apparatus that obtains and displays elasticity information of a living tissue or the like using ultrasonic waves, and a shear wave propagation image generation method.
  • the ultrasonic diagnostic apparatus transmits an ultrasonic wave to a biological tissue or the like by an ultrasonic probe, receives an ultrasonic reflected echo signal corresponding to the structure of the biological tissue or the like, and generates and displays an ultrasonic tomographic image.
  • the biological tissue or the like is compressed with an ultrasonic probe using a technique or a mechanical method, and the displacement of the biological tissue is obtained based on the frame data of two ultrasonic signals having different measurement times, and the biological tissue is obtained from the displacement data. It is possible to generate an elasticity image showing elasticity information on the hardness or softness of the image.
  • a method for obtaining elasticity information using ultrasonic waves there is a method using a wave called a shear wave generated by a low frequency (about 1 kHz) vibration applied to a living body or the like. Since the propagation speed of the shear wave indicates the hardness of the propagation medium and is proportional to the square root of the shear elastic modulus, the elasticity information of the living tissue can be obtained by measuring the propagation speed of the shear wave using ultrasonic waves. Examples of such techniques include Patent Documents 1 and 2.
  • Patent Document 1 a dedicated probe for measuring the propagation speed of shear waves is used.
  • a tomographic image of the subject cannot be acquired with this probe alone.
  • the shear wave propagation velocity cannot be measured.
  • Patent Documents 1 and 2 also describe that a dedicated probe for measuring the propagation speed of shear waves is attached to a probe for tomographic image acquisition, but two probes are required, and tomographic image acquisition is also required. Since two ultrasonic transmission / reception units are required for measuring the propagation speed of shear waves and shear waves, the operation and configuration become complicated.
  • the problem to be solved by the present invention is to provide an ultrasonic diagnostic apparatus and a shear wave propagation image generation method capable of acquiring tomographic images with one ultrasonic probe and acquiring elastic information by shear waves.
  • an ultrasonic diagnostic apparatus of the present invention includes an ultrasonic probe that transmits and receives ultrasonic waves to and from a subject, a vibrator that generates shear waves in the subject, and the ultrasonic probe.
  • An ultrasonic diagnostic apparatus comprising: a transmission / reception unit that performs transmission and reception processing of the ultrasonic wave between; and a tomographic image configuration unit that forms a tomographic image based on the reflected echo signal received and processed by the transmission / reception unit.
  • the transmission / reception unit transmits / receives the ultrasonic wave to / from the subject at a time interval and obtains shear wave propagation information based on the transmission / reception, and the obtained shear wave
  • a shear wave image constituting unit that constitutes a shear wave image representing the propagation information of the image
  • an image display unit that displays the shear wave image and the tomographic image.
  • scanning is performed while transmitting and receiving ultrasonic waves for acquiring tomographic images using the same ultrasonic probe, while transmission and reception of ultrasonic waves for acquiring tomographic images is paused at set time intervals,
  • shear wave propagation information can be acquired while acquiring a tomographic image. Accordingly, the propagation information of the shear wave can be acquired together with the tomographic image without the two probes of the probe for acquiring the tomographic image and the probe for measuring the propagation speed of the shear wave.
  • the shear wave propagation information includes the shear wave propagation position and propagation time, and the shear wave propagation speed can be obtained from these relationships.
  • the propagation position of the shear wave is obtained from the time until the ultrasonic wave for detecting the propagation position is reflected back to the shear wave and the velocity of the ultrasonic wave. Thereby, the elasticity information of the hardness or softness of the living tissue can be acquired.
  • ultrasonic transmission / reception units for tomographic image acquisition and shear wave propagation position detection can be provided, respectively, or one can be shared. In order to accurately obtain the relationship between the propagation position of the shear wave and the propagation time, it is desirable to transmit and receive as many ultrasonic waves for detecting the propagation position as possible in one frame.
  • a direction setting unit that sets a direction for transmitting and receiving ultrasonic waves for detecting a propagation position with respect to the subject is provided, and the direction setting unit has a direction (setting direction) on the tomographic image displayed on the image display unit. It can also comprise so that the measurement line production
  • the propagation image construction unit can construct a shear wave image based on the depth of the shear wave with respect to the subject and the elapsed time from the generation of the shear wave.
  • the propagation image forming unit can be configured to display a shear wave image corresponding to a region selected on the tomographic image displayed on the image display unit on the image display unit.
  • region corresponding to a tomographic image can be confirmed easily, and usability improves.
  • the ultrasonic diagnostic apparatus can be provided with an elastic information calculation unit for calculating an elastic modulus distribution based on the shear wave image.
  • the image display unit can be configured to display the combined elastic modulus distribution in association with the tomographic image. This makes it easy to confirm the elastic modulus distribution on the tomographic image, and improves usability.
  • an M mode image configuration unit that configures an M mode image based on the reflected echo signal received and processed by the transmission / reception unit is provided, and the tomographic image, the shear wave image, and the M mode image are displayed side by side on the image display unit. It can also be configured as follows. Furthermore, the transmission / reception unit may be configured to detect the change on the M-mode image and start transmitting the ultrasonic wave for detecting the propagation position.
  • an elastic image constructing unit that generates RF frame data by receiving and processing a reflected echo signal in the process of applying pressure to the subject via an ultrasonic probe, and an elastic image and a shear wave image are juxtaposed instead of the tomographic image
  • a display selection unit that selects either a display method for displaying the image, or a display method for displaying the elastic image, the shear wave image, and the tomographic image in parallel, and the image display unit is selected. It is also possible to configure to display an image of a different display method.
  • ultrasonic waves are transmitted to and received from an object using an ultrasonic probe, shear waves are generated in the object provided on the ultrasonic probe by a vibrating body, and transmitted and received.
  • the ultrasonic transmission and reception processing is performed with the ultrasonic probe by the unit, the tomographic image is configured based on the reflected echo signal received and processed by the transmission and reception unit by the tomographic image configuration unit, and the propagation position is detected by the transmission and reception unit.
  • the first step includes a step of setting a direction for transmitting and receiving ultrasonic waves for detecting a propagation position of shear waves to the subject by the direction setting unit, and a tomographic image displayed on the image display unit by the direction setting unit. And a step of generating a measurement line indicating a direction by the measurement line generation unit, and the third step is performed on the tomographic image displayed on the image display unit by the propagation image configuration unit. It can also be configured to include a step of constructing a shear wave image based on the selected region.
  • the fourth step is a step of calculating an elastic modulus distribution based on the shear wave image by the elastic information calculating unit, and combining and displaying the elastic modulus distribution in association with the tomographic image on the image display unit, and an M mode.
  • a step of constructing an M mode image based on the reflected echo signal received and processed by the transmission / reception unit by the image construction unit, and a step of juxtaposing and displaying the M mode image, the tomographic image, and the shear wave image on the image display unit It can also be configured to include.
  • the reflected image signal in the process of applying pressure to the subject via the ultrasonic probe by the elastic image forming unit is received to generate RF frame data, and the elastic image is generated from the RF frame data.
  • a display method in which an elastic image and a shear wave image are displayed side by side instead of a tomographic image by a display step, or a display method in which an elastic image, a shear wave image, and a tomographic image are displayed in parallel It is also possible to include a step of selecting any one of the display methods and a step of displaying an image of the selected display method on the image display unit.
  • an ultrasonic diagnostic apparatus capable of acquiring a tomographic image with one ultrasonic probe and acquiring elastic information by shear waves.
  • Configuration diagram of the ultrasonic diagnostic apparatus of the present invention (a) shows the configuration of the ultrasonic probe, and (b) shows the state of the ultrasonic wave transmitted from the ultrasonic probe.
  • Ultrasonic transmission timing chart Diagram showing the relationship between shear wave depth and time Example of shear wave image displayed on image display Screen displaying B-mode image, M-mode image, and shear wave image Screen with elasticity information displayed on the B-mode image Flow chart until acquiring elastic information by shear wave
  • the ultrasonic diagnostic apparatus of the present embodiment includes an ultrasonic probe 4 that transmits and receives ultrasonic waves to and from a subject 5, and a mechanism that can be attached to and detached from the ultrasonic probe 4.
  • a vibrating body 3 that generates a shear wave by applying a low-frequency vibration to the subject 5 via the probe 4 and a transmitter that repeatedly transmits ultrasonic waves to the subject 5 via the ultrasonic probe 4 at time intervals.
  • a receiving unit 6 that receives a time-series reflected echo signal generated from the subject 5
  • an ultrasonic transmission / reception control unit 1 that controls the transmitting unit 2 and the receiving unit 6, and a reflected echo received by the receiving unit 6
  • a phasing adder 7 for phasing and adding signals.
  • the tomographic image constructing unit 8 constituting the tomographic image of the subject 5, for example, a black and white tomographic image, and the output signal of the tomographic image constructing unit 8 And a black and white scan converter 9 for converting the image display unit 18 so as to match the display.
  • RF Radio Frequency
  • the frame data memory 10a that stores the RF frame signal output from the phasing addition unit 7, the displacement measurement unit 10 that measures the displacement generated in the living tissue of the subject 5, and the displacement measurement unit 10
  • Elasticity information calculation unit 11 for obtaining strain or elastic modulus for calculating elasticity information in a continuous compression process from displacement information, and an elastic image constituting a color elasticity image from the strain or elastic modulus calculated by the elasticity information calculation unit 11
  • a configuration unit 12 and a color scan converter 13 that converts the output signal of the elastic image configuration unit 12 to match the display of the image display unit 18 are provided.
  • the line data memory 14a for storing an RF line signal, which will be described in detail later, outputted from the phasing adder 7, and the direction in which the ultrasonic wave 21 for detecting the propagation position of the shear wave is transmitted to and received from the subject 5 are transmitted.
  • Direction setting unit 14b for setting, shear wave propagation position detection unit 14 for obtaining propagation information of shear wave, and shear wave for obtaining Young's modulus for calculating elastic information from propagation information obtained by shear wave propagation position detection unit 14
  • An elastic information calculation unit 15 and a shear wave image construction unit 16 that generates an image based on the time axis from the propagation information obtained by the shear wave propagation position detection unit 14 are provided. Note that the output signal of the shear wave image constructing unit 16 is converted by the color scan converter 13 so as to match the display of the image display unit 18.
  • a switching addition unit 17 that superimposes a monochrome tomographic image and a color elastic image, displays them in parallel, or switches them, an image display unit 18 that displays a synthesized composite image, and The console 19 is provided.
  • the ultrasonic probe 4 is formed by arranging a plurality of transducers, and has a function of transmitting and receiving ultrasonic waves to and from the subject 5 via the transducers.
  • the transmission unit 2 generates a transmission pulse for generating an ultrasonic wave by driving the ultrasonic probe 4, and has a function of setting a convergence point of the transmitted ultrasonic wave to a certain depth.
  • the receiving unit 6 amplifies the reflected echo signal received by the ultrasonic probe 4 with a predetermined gain to generate an RF signal, that is, a received signal.
  • the phasing / adding unit 7 inputs the RF signal amplified by the receiving unit 6 and performs phase control, and forms an ultrasonic beam at one point or a plurality of convergence points to generate an RF frame signal.
  • the tomographic image construction unit 8 receives the RF frame signal from the phasing addition unit 7 and performs signal processing such as gain correction, log compression, detection, contour enhancement, filter processing, and so forth, such as a B-mode image and an M-mode image. The tomographic image data is obtained.
  • the black-and-white scan converter 9 includes an analog / digital converter (not shown) that converts tomographic image data from the tomographic image construction unit 8 into a digital signal, a frame memory that stores a plurality of converted tomographic image data in time series, a control controller, It is comprised including.
  • the black-and-white scan converter 9 acquires tomographic frame data in the subject 5 stored in the frame memory as one image, and reads the acquired framed frame data in synchronization with the television.
  • the RF frame signal output from the phasing adder 7 is appropriately selected and recorded in the frame data memory 10a.
  • the displacement measurement unit 10 performs one-dimensional or two-dimensional correlation processing from one set of data in the frame data memory 10a, and performs displacement and movement vectors in the biological tissue corresponding to each point of the tomographic image, that is, the direction and magnitude of the displacement. Find the one-dimensional or two-dimensional displacement distribution on the height.
  • the movement vector detection method is a block matching method.
  • the block matching method divides an image into blocks of N ⁇ N pixels, for example, pays attention to the block in the region of interest, searches the previous frame for the block that is closest to the block of interest, and refers to this Thus, predictive encoding, that is, processing for determining the sample value by the difference is performed.
  • the elasticity information calculation unit 11 calculates strain or elastic modulus for the data output from the displacement measurement unit 10. For example, when calculating the elastic modulus, a pressure value measured by a pressure sensor (not shown) connected to the ultrasonic probe 4 can be used, but strain data is calculated from output data from the displacement measuring unit 10. There is a need. This strain data is calculated by spatially differentiating the movement amount of the living tissue, for example, the displacement. The elastic modulus data is calculated by dividing the change in pressure by the change in strain.
  • the Young's modulus is a ratio of a simple tensile stress applied to an object and a strain generated in parallel to the tension.
  • the elastic image construction unit 12 includes a frame memory (not shown) and an image processing unit, and secures the elastic frame data output in time series from the elastic information calculation unit 11 in the frame memory. On the other hand, desired image processing is performed.
  • the color scan converter 13 has a function of adding hue information to elastic image data from the elastic image construction unit 12 and a shear wave image construction unit 16 described later.
  • the light is converted into three primary colors, that is, red (R), green (G), and blue (B).
  • R red
  • G green
  • B blue
  • elastic data having a large strain is converted into a red code
  • elastic data having a small strain is converted into a blue code.
  • the configuration that is a feature of the present embodiment is, in particular, between the ultrasonic probe 4 that transmits and receives ultrasonic waves to and from the subject 5, the vibrator 3 that generates shear waves in the subject 5, and the ultrasonic probe 4.
  • Transmission / reception units 2 and 6 that perform transmission and reception processing of ultrasonic waves, and a tomographic image configuration unit 8 that forms a tomographic image based on the reflected echo signals received and processed by the transmission / reception units 2 and 6
  • a diagnostic apparatus wherein transmission / reception units 2 and 6 transmit and receive ultrasonic waves to and from a subject 5 at time intervals, and obtain shear wave propagation information based on the transmission and reception, and a shear wave propagation position detection unit 14
  • a shear wave image constructing unit 16 that constitutes a shear wave image representing the obtained shear wave propagation information, and an image display unit 18 that displays the shear wave image and the tomographic image are provided.
  • the detachable vibrator 3 is attached to the ultrasonic probe 4.
  • the vibration emitted from the vibrating body 3 may be either continuous or single vibration.
  • the ultrasonic wave irradiated to the subject 5 from the transmitting unit 2 via the ultrasonic probe 4 includes the ultrasonic wave 20 for tomographic image acquisition and the propagation position of the shear wave.
  • the ultrasonic wave 20 for tomographic image acquisition is to transmit a plurality of transducers arranged in the ultrasonic probe 4 by sequentially switching them.
  • the transmission direction of the ultrasonic wave 21 for detecting the propagation position of the shear wave is determined in advance. In the present embodiment, it is the depth direction of the subject 5.
  • the ultrasonic wave 21 for detecting the propagation position is transmitted only from a portion set in advance as a channel among a plurality of transducers arranged in the ultrasonic probe 4.
  • the transducer in the middle of the ultrasonic probe 4 is set as a channel.
  • FIG. 3 shows a transmission timing chart of the ultrasonic wave 20 for tomographic image acquisition and the ultrasonic wave 21 for propagation position detection.
  • the ultrasonic wave 21 for detecting the propagation position is transmitted once every time a plurality of ultrasonic waves 20 for acquiring the tomographic image are transmitted, and the transmission interval is ⁇ .
  • PRF pulse repetition frequency
  • the reception signal of the ultrasonic wave 21 for detecting the propagation position transmitted in this way is sequentially recorded in the line data memory 14a.
  • This received signal is a signal affected by the shear wave when the ultrasonic wave 21 for detecting the propagation position is reflected by the shear wave.
  • the shear wave propagation position detector 14 obtains shear wave propagation information from a plurality of received signals.
  • the shear wave propagation information includes the shear wave propagation position and propagation time. The propagation position of the shear wave is obtained from the time until the ultrasonic wave 21 for detecting the propagation position is reflected back to the shear wave and the velocity of the ultrasonic wave.
  • Fig. 4 shows a graph showing the relationship between the depth (vertical axis) and the time (horizontal axis), which are the shear wave positions.
  • the rectangles in FIG. 4 are displacements generated along with the propagation of the shear wave.
  • the width of the rectangle in the vertical direction of the paper corresponds to the wave number of the shear wave, and the width in the horizontal direction of the paper corresponds to the amplitude.
  • the shear wave propagates to the inside of the subject 5 with the passage of time, but the propagation speed can be calculated by the depth and time (reciprocal of ⁇ ) obtained by the ultrasonic wave 21 for detecting the propagation position. .
  • the shear wave image construction unit 16 generates a shear wave image from the shear wave propagation information in the depth direction obtained by the shear wave propagation position detection unit 14 and a graph of the elasticity information by the shear wave obtained by the shear wave elasticity information calculation unit 15.
  • Configure and color scan converter 13 images it.
  • FIGS. 5A and 5B show examples of shear wave images.
  • the vertical axis represents depth (upper side is 0) and the horizontal axis represents time, and the slope represents the propagation speed. Since the propagation speed increases as the medium becomes harder, FIG. 5 (a) shows that the medium is harder than in FIG. 5 (b).
  • the elastic information graph based on shear waves has a Young's modulus on the vertical axis and a depth on the horizontal axis, and is shown on the B-mode image in FIG. 7 in the present embodiment.
  • the switching addition unit 17 includes a frame memory (not shown), an image processing unit, and an image selection unit (display selection unit).
  • the frame memory stores the tomographic image data from the monochrome scan converter 9 and the elastic image data from the color scan converter 13, and the tomographic image data and the elastic image data (the image of the propagation velocity distribution) are stored by the image processing means.
  • the image processing means are also synthesized at different synthesis ratios.
  • the luminance information and hue information of each pixel of the composite image is obtained by adding each information of the black and white tomographic image and the color elastic image at the composite ratio. Further, the image selection means selects an image to be displayed on the image display unit 18 from the tomographic image data and elasticity image data in the frame memory and the composite image data of the image processing unit.
  • FIG. 6 shows an example of a screen displayed on the image display unit 18.
  • FIG. 6 shows a state in which three types of images, a B-mode image, an M-mode image, and a shear wave image are drawn.
  • a B-mode image is displayed in real time, and a measurement line 22 indicating a position for obtaining a shear wave image is displayed on the B-mode image.
  • the inspector can freely change the position of the measurement line 22 by issuing a command to the direction setting unit 14b using the console 19.
  • a channel for transmitting the ultrasonic wave 21 for detecting the propagation position is determined.
  • the M mode image in the measurement line 22 is shown, and in the lower right half of FIG. 6, the propagation velocity distribution image in the measurement line 22 is shown as a semitransparent display.
  • the inspector conducts the inspection while confirming the B-mode image depicted in the left half of Fig. 6, and determines the cross section for which the shear wave image is to be obtained.
  • a measurement line 22 is set for the determined cross section (FIG. 6 shows a case where the measurement line is set at the center).
  • the vibrating body 3 attached to the ultrasonic probe 4 is manually operated to apply a low frequency vibration to the subject 5 to generate a shear wave, and a shear wave image is obtained as described above.
  • FIG. 7 is a screen in which the elasticity information obtained by the shear wave elasticity information calculation unit 15 is synthesized and displayed on the measurement line 22 of the B-mode image in FIG. As a result, the elasticity information can be confirmed on the B-mode image, which improves usability.
  • Fig. 8 shows a flowchart for acquiring elasticity information by shear waves.
  • a step of transmitting and receiving ultrasonic waves to and from the subject 5 by the ultrasonic probe 4, a step of generating a shear wave in the subject 5, a step of obtaining shear wave propagation information, and a shear representing the propagation information of the shear wave A step of constructing a wave image, and a step of displaying the shear wave image and the tomographic image in association with each other on the image display unit 18.
  • the inspector performs ultrasonic diagnosis using the B-mode image, and at the same time, determines a cross section for acquiring elastic information by shear waves using the measurement line 22 (step 1).
  • the examiner applies vibration to the subject 5 by operating the vibrating body 3 attached to the ultrasonic probe 4 (step 2).
  • the ultrasonic wave 21 for detecting the propagation position of the shear wave is transmitted from the transmission unit 2 a plurality of times at time intervals toward the cross section set by the measurement line 22 (step 3).
  • the shear wave propagation position detection unit 14 obtains the shear wave propagation position and the shear wave propagation time based on the transmission and reception in Step 3 (Step 4).
  • the shear wave image constructing unit 16 constructs a shear wave image representing the relationship between the propagation position and propagation time of the shear wave obtained in Step 4 (Step 5).
  • the tomographic image construction unit 8 constructs an M-mode image based on the reflected echo signal received and processed by the transmission / reception unit (step 6).
  • the shear wave image configured in step 5 and the B mode image are displayed in association with each other, and the M mode image configured in step 6 is juxtaposed (step 7).
  • the elastic modulus distribution on the measurement line is calculated based on the shear wave image by the shear wave elastic information calculation unit 15, and the B mode image displayed on the image display unit 18 is combined with the elastic modulus distribution and displayed. (Step 8).
  • scanning is performed while transmitting and receiving the ultrasonic wave 20 for tomographic image acquisition using the same ultrasonic probe 4, while transmission and reception of the ultrasonic wave 20 for acquiring the tomographic image is set.
  • the propagation position of the shear wave is detected while acquiring the tomographic image be able to. Accordingly, the relationship between the propagation position of the shear wave and the propagation time in the setting direction can be acquired together with the tomographic image, even without the probe for tomographic image acquisition and the probe for measuring the propagation speed of the shear wave. From the relationship between the propagation position of the shear wave and the propagation time, the propagation speed of the shear wave can be obtained, whereby the elasticity information of the hardness or softness of the biological tissue in the set direction can be acquired.
  • the direction setting unit 14b is configured to include a measurement line generation unit that generates the measurement line 22 indicating the setting direction on the B mode image of FIG. 6 displayed on the image display unit 18, the shear wave image The line you want to get can be determined by referring to the B-mode image.
  • the image display unit 18 is configured to display the composite elastic modulus distribution obtained by the shear wave elastic information calculation unit 15 in association with the B mode image, the elastic modulus distribution is confirmed on the B mode image. Easier to use, and easier to use.
  • the present invention is not limited to this, and can be applied by appropriately changing the configuration.
  • the inspector uses the console 19 to display the elastic image, the shear wave image, and the M mode image side by side instead of the B mode image in FIG.
  • Any display method of displaying elastic images, shear wave images, B-mode images, and M-mode images side by side can be selected, and the selection step can be added to the flowchart of FIG.
  • a display method using only a B-mode image and a shear wave image can be configured.
  • the ultrasonic wave 21 for detecting the propagation position is transmitted at the time of acquiring the B-mode image regardless of whether or not a shear wave is generated. Since a change occurs on the mode image, the ultrasonic wave 21 for detecting the propagation position may be transmitted when this change is detected.
  • the shear wave image construction unit 16 can be configured to display a shear wave image corresponding to the region selected on the B-mode image of FIG. 6, and such a step is added to the flowchart of FIG. Also good. Thereby, the shear wave image of the corresponding region in the B-mode image can be easily confirmed, and the usability is improved.

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Abstract

L'invention porte sur un appareil de diagnostic ultrasonore et sur un procédé de génération d'image à propagation d'ondes rotationnelles dans lequel des images laminographiques peuvent être acquises avec une seule sonde ultrasonore et des informations d'élasticité à l'aide d'ondes rotationnelles peuvent être acquises. Dans un procédé d'acquisition d'images laminographiques à base de signaux d'écho réfléchissant reçus à partir d'une sonde ultrasonore (4) qui transmet/reçoit les ondes ultrasonores à/depuis un sujet (5), un vibreur (3) est utilisé pour provoquer l'apparition d'ondes rotationnelles dans le sujet (5) et les images d'ondes rotationnelles sont générées et affichées.
PCT/JP2010/059240 2009-07-02 2010-06-01 Appareil de diagnostic ultrasonore et procédé de génération d'image par propagation d'ondes rotationnelles WO2011001776A1 (fr)

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