JP3578680B2 - Ultrasound diagnostic equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an ultrasonic diagnostic apparatus, and more particularly to an ultrasonic diagnostic apparatus that displays a blood flow velocity and a moving velocity of a blood vessel wall from an ultrasonic echo signal in a living body.
[0002]
[Prior art]
Ultrasound diagnosis of the carotid artery for the purpose of arteriosclerosis diagnosis uses the B-mode function, M-mode function, shape diagnosis, FFT Doppler function, and color Doppler function, which are the main functions of current general-purpose ultrasonic diagnostic equipment. It is performed using the results of the blood flow velocity diagnosis.
[0003]
In the B mode function, the evaluation of the inner diameter of the blood vessel, the evaluation of the blood vessel wall thickness, and the evaluation of the raised lesion are performed. In the M mode function, the temporal change in the blood vessel diameter is evaluated. In the FFT Doppler function and the color Doppler function, Then, the blood flow velocity at the vascular stenosis site due to the raised lesion is evaluated.
[0004]
In the evaluation of a raised lesion using the B-mode function, the nature of the lesion is determined from observation of the presence and size of the raised lesion and the luminance of an ultrasonic echo image displayed on a monitor. However, the evaluation method using the B-mode function has a problem that it is difficult to find a low-luminance object such as a protruding lesion mainly due to a thrombus, and it is not possible to quantitatively evaluate the property because the property is determined based on the luminance. .
[0005]
As the function of the ultrasonic diagnostic apparatus for the purpose of tissue property diagnosis, first, as disclosed in Japanese Patent Application Laid-Open No. 9-313485, there is an apparatus using tissue Doppler imaging. Since the movement of the tissue is measured, it is difficult to detect a portion of the movement of the whole tissue that has stopped functioning and is not moving. In addition, ultrasonic echo signals from a living body include not only tissue but also echo signals from blood flow.In tissue Doppler imaging, signals obtained by phase detection of the Doppler shift frequency of ultrasonic echo signals Unnecessary Doppler components other than movement are removed, so that the movement speed of the tissue and the blood flow speed cannot be transmitted and received by the same ultrasonic wave.
[0006]
Second, as disclosed in Japanese Patent Application Laid-Open No. 10-5226, as a function of the ultrasonic diagnostic apparatus for the purpose of similar tissue characterization, information on the amplitude and phase of a detection output signal of an ultrasonic echo is used. By using the least-squares method to determine the instantaneous position of an object, there is an advantage that high-precision tracking can be performed and micro-motion in a tissue that is largely moving due to pulsation or the like can be measured. .
[0007]
[Problems to be solved by the invention]
However, with conventional ultrasonic diagnostic equipment, it is possible to know the properties of a raised lesion when diagnosing a raised lesion in a blood vessel, but to know the speed of blood flow flowing through the raised lesion with the same ultrasound transmission and reception. There was a problem that can not be.
[0008]
The present invention solves such a problem, and separates a component of an ultrasonic echo from a biological tissue and a component from a blood flow to measure the micro-motion velocity and the blood flow velocity of the tissue at the same level. The purpose is to simultaneously perform transmission and reception of sound waves.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, an ultrasonic diagnostic apparatus, a transmitting unit that transmits an ultrasonic wave from an ultrasonic probe into a living body, and a receiving unit that receives an ultrasonic echo obtained from a living body, Delay control means for controlling the direction of the acoustic line for transmission and reception of ultrasonic waves, phase detection means for phase-detecting the ultrasonic echo, a filter for removing ultrasonic echo components from tissue from the phase-detected signal, and a phase-detected signal A filter for removing an ultrasonic echo component from a blood flow, a detection signal comparing means for comparing a signal from which an ultrasonic echo component is removed from a tissue with a signal from which an ultrasonic echo component is removed from a blood flow, and phase detection. Blood flow velocity calculating means for calculating the blood flow velocity from the detected signal; tissue movement speed calculating means for calculating the movement velocity of the tissue mainly including the blood vessel wall from the phase detected signal; Comprising a display means for displaying the rate of movement of tissue, based on the comparison result from the detection signal comparison means, an ultrasonic echo components from the phase and the blood flow signal to remove the ultrasonic echo components from the tissue phase of the removed signal is a configuration that controls the orientation of the acoustic line of the ultrasonic wave transmitted and received by delay control means can be separated, respectively.
[0010]
With this configuration, the user can easily confirm the deflection angle of the acoustic line, and can determine the blood flow velocity and the ultrasonic echo from the blood flow and the ultrasonic echo from the tissue mainly including the blood vessel wall. It is possible to simultaneously measure the movement speed of the tissue mainly including the blood vessel wall.
[0011]
Further, the result calculated by the blood flow velocity calculating means from the phase detection signal from the blood flow and the result calculated by the tissue motion velocity calculating means from the phase detection signal from the tissue mainly including the blood vessel wall are represented by a DSC (digital scan). (Converter) to convert to a video signal and display it on the monitor together with the B-mode image. With this configuration, the user can easily confirm the deflection angle of the acoustic ray, and can grasp the blood flow velocity and the movement velocity of the tissue mainly including blood vessels on the cross-sectional image.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
[0013]
(First Embodiment)
The first embodiment of the present invention, a phase of a signal obtained by removing the ultrasonic echo components from the tissue, the phase of the ultrasonic echo component removal signal of the blood flow on to enable the separation, respectively, delay An ultrasonic diagnostic apparatus in which a control unit controls the direction of an acoustic line for transmitting and receiving ultrasonic waves.
[0014]
FIG. 1 is a functional block diagram showing a configuration of the ultrasonic diagnostic apparatus according to the first embodiment of the present invention. In FIG. 1, an ultrasonic probe 1 is means for converting an electric signal into an ultrasonic wave and transmitting the ultrasonic wave to a living body. The ultrasonic transmission / reception unit 2 is means for transmitting / receiving ultrasonic waves to / from a living body via an ultrasonic probe. The delay control unit 3 is a unit that performs transmission delay control. The phase detector 4 is a means for performing phase detection on the received signal. The filters 5 and 6 are filters that can set a cutoff frequency according to the application. The detection signal comparison unit 7 is a means for comparing a phase, an amplitude, and the like. The blood flow velocity calculator 8 is a means for calculating the blood flow velocity. The tissue movement speed calculator 9 is a means for calculating the movement speed of the blood vessel wall. The detection unit 10 is a means for performing envelope detection on the received signal. The DSC 12 is a means for converting the image into a video signal. The display control unit 13 is means for converting a video signal into a display signal. The monitor 14 is a device that displays a display signal.
[0015]
The operation of the ultrasonic diagnostic apparatus according to the first embodiment of the present invention configured as described above will be described. The ultrasonic probe 1 transmits and receives ultrasonic waves to and from a living body. The transmission of the ultrasonic wave is performed after the transmission delay control is performed by the delay control unit 3 of the ultrasonic diagnostic apparatus main body 18, the electric signal is converted into the ultrasonic wave by the ultrasonic probe 1 via the transmission / reception unit 2, and transmitted to the living body. I do. The ultrasonic echo obtained from the living body is converted into an electric signal by the ultrasonic probe 1, and is input to the detector 10 and the phase detector 4 via the ultrasonic transmitter / receiver 2 and the delay controller 3.
[0016]
The detection unit 10 performs envelope detection on the received signal, converts the envelope-detected signal into a video signal by the DSC 12, and outputs it to the monitor 14 via the display control unit 13. The phase detector 4 detects the phase of the received signal. The filters 5 and 6 separate a signal from which an ultrasonic echo component is mainly removed from a blood flow and a signal from which an ultrasonic echo component is mainly removed from a tissue. The signal is converted into a video signal by the DSC 12 via the detection signal comparison unit 7 and output to the monitor 14 via the display control unit 13.
[0017]
The filters 5 and 6 have basically the same function, and can set a cutoff frequency according to the application. FIG. 2 is a diagram illustrating characteristics of the filters 5 and 6. The phase shifts (Doppler shifts) 20 and 21 of the ultrasonic echo from the living body are small from the tissue and large from the blood flow. In FIG. 2, a high-pass filter (HPF) removes an ultrasonic echo component from the tissue to extract a Doppler signal from the blood flow, and a low-pass filter (LPF) removes the ultrasonic echo component from the blood flow to remove the ultrasonic echo component from the blood flow. 2 also shows an example of extracting a Doppler signal from a. However, since the phase shift (Doppler shift) component of the ultrasonic echo from the living body may not be able to be separated from the tissue and the blood flow, the cutoff frequencies of the filters 5 and 6 can be set arbitrarily. May be.
[0018]
FIG. 3 shows an example in which the cutoff frequency of the LPF is arbitrarily set according to the phase shift (Doppler shift) component of the ultrasonic echo. FIG. 3 shows an example of the LPF, but similar settings can be made in the HPF. Further, by utilizing the fact that the amplitude of the ultrasonic echo from the blood flow is small, the ultrasonic echo component from the blood flow may be removed at a certain threshold value.
[0019]
The signals separated into the ultrasonic echo component due to the blood flow and the ultrasonic echo component due to the tissue by the filters 5 and 6 are compared with each other by a detection signal comparing unit 7 in terms of phase or amplitude. From the comparison result, so that both of the phase shift (Doppler shift) component of the ultrasonic echo by tissue phase shift (Doppler shift) component of the ultrasonic echo by blood flow can detect separated by the delay control unit 3, ultrasonic Controls the direction of the acoustic line for transmission and reception. The direction of the acoustic line transmitted from the ultrasonic probe is controlled to the direction of the ultrasonic line for transmitting and receiving the ultrasonic wave, which allows simultaneous measurement of the direction of the blood flow and the motion of the blood vessel wall.
[0020]
As described above, in the first embodiment of the present invention, the ultrasonic diagnostic apparatus is configured to determine the phase of the signal from which the ultrasonic echo component has been removed from the tissue and the phase of the signal from which the ultrasonic echo component has been removed from the blood flow. phase on to enable the separation, respectively, since a configuration for controlling the direction of the acoustic line of the ultrasonic wave transmission and reception by the delay control unit, measured separately ultrasonic echo component by the blood flow, an ultrasonic echo component by tissue it can.
[0021]
(Second embodiment)
According to the second embodiment of the present invention, a signal from which an ultrasonic echo component is removed from a tissue and a signal from which an ultrasonic echo component is removed from a blood flow are separated based on a comparison result from a detection signal comparing unit. This is an ultrasonic diagnostic apparatus that performs observation by controlling the direction of an acoustic line for ultrasonic transmission and reception by a delay control unit.
[0022]
The configuration of the ultrasonic diagnostic apparatus according to the second embodiment of the present invention is the same as that of FIG. FIG. 4A is a diagram illustrating a state in which the direction of the ultrasonic acoustic line of the ultrasonic diagnostic apparatus according to the second embodiment of the present invention is deflected, and FIG. It is a figure which shows the phase shift (Doppler shift) of an echo. FIG. 5A is a diagram illustrating an example in which the direction of the ultrasonic acoustic line is orthogonal to the direction of the blood flow, and FIG. 5B is an example of the ultrasonic echo phase shift (Doppler shift) at that time. FIG. FIG. 6A is a diagram illustrating an example where the deflection angle of the ultrasonic acoustic line is increased, and FIG. 6B is a diagram illustrating an example of the phase shift (Doppler shift) of the ultrasonic echo at that time. It is. FIG. 7 is a schematic diagram of measurement when blood vessels are not parallel to the body surface.
[0023]
The operation of the ultrasonic diagnostic apparatus according to the second embodiment of the present invention configured as described above will be described. When simultaneously measuring the blood flow velocity and the movement velocity of the tissue in the ultrasonic diagnostic apparatus of FIG. 1, the direction of the ultrasonic acoustic line is deflected so that the phase shift (Doppler shift) of the ultrasonic echo from the living body can be detected. This makes it possible to simultaneously measure the phase shift (Doppler shift) of the ultrasonic echo due to the direction of the orthogonal blood flow and the motion of the blood vessel wall. FIG. 4 shows an example in which the direction of the ultrasonic acoustic line is deflected (the direction of the acoustic line for transmitting and receiving the ultrasonic wave transmitted from the ultrasonic probe is inclined with respect to the longitudinal direction of the blood vessel and the vertical direction of the blood flow), and the resulting ultrasonic wave. An example of a phase shift (Doppler shift) of an acoustic echo is shown.
[0024]
When the direction of the acoustic line of the ultrasonic wave transmitted and received from the ultrasonic probe 1 is the same as the direction of movement of the blood vessel wall, the direction of the ultrasonic acoustic line is orthogonal to the direction of the blood flow. Shift (Doppler shift) cannot be measured. FIG. 5 shows an example in which the direction of the ultrasonic acoustic line is orthogonal to the direction of the blood flow, and an example of the phase shift (Doppler shift) of the ultrasonic echo at that time.
[0025]
When the direction of the acoustic line of the ultrasonic wave transmitted and received from the ultrasonic probe 1 is deflected so as to be as close as possible to the direction of the blood flow, the phase shift (Doppler shift) of the ultrasonic echo due to the motion of the blood vessel wall is very small. No, it cannot be measured. FIG. 6 shows an example in which the deflection angle of the ultrasonic acoustic line is increased and an example of the phase shift (Doppler shift) of the ultrasonic echo at that time.
[0026]
The detection signal comparison unit 7 compares the phase shift (Doppler shift) component of the ultrasonic echo due to the motion of the blood vessel wall with the phase shift (Doppler shift) component of the ultrasonic echo due to the blood flow, and each of them compares the phase shift (Doppler shift) component. The deflection angle of the acoustic line of the ultrasonic transmission / reception that can be detected is transmitted to the delay control unit 3. As shown in FIG. 7, this is very useful when blood vessels are not parallel to the body surface.
[0027]
In addition to the phase shift (Doppler shift) between the ultrasonic echo caused by the motion of the blood vessel wall and the ultrasonic echo caused by the blood flow, the amplitude of the frequency spectrum and the like may be compared. In addition, the direction of the acoustic line for transmitting and receiving the ultrasonic wave may be illustrated in the B-mode image so that the user can easily correct the direction.
[0028]
As described above, in the second embodiment of the present invention, based on the comparison result from the detection signal comparison unit, the ultrasonic diagnostic apparatus performs the operation based on the signal obtained by removing the ultrasonic echo component from the tissue and the blood flow. The delay control unit controls the direction of the acoustic line transmitted and received by the delay control unit so that the signal from which the ultrasonic echo component is removed can be observed. Can be done simultaneously.
[0029]
(Third embodiment)
In the third embodiment of the present invention, the blood flow velocity and the movement velocity of the blood vessel wall are calculated in real time, and the waveform of the blood flow velocity and the movement velocity of the blood vessel wall are simultaneously displayed on the B-mode image of the monitor. It is an ultrasonic diagnostic apparatus.
[0030]
The configuration of the ultrasonic diagnostic apparatus according to the third embodiment of the present invention is the same as that of FIG. FIG. 8 is a schematic diagram of an example in which the blood flow velocity and the movement velocity of the blood vessel wall are displayed as waveforms on the B-mode image.
[0031]
The operation of the ultrasonic diagnostic apparatus according to the third embodiment of the present invention configured as described above will be described. In the ultrasonic diagnostic apparatus shown in FIG. 1, a received ultrasonic echo of one acoustic line is separated by a filter 5 and a filter 6, and a phase shift (Doppler shift) component of the ultrasonic echo due to blood flow and a motion of a blood vessel wall are generated. Obtain the phase shift (Doppler shift) component of the ultrasonic echo. The phase shift (Doppler shift) component of the ultrasonic echo due to the blood flow and the phase shift (Doppler shift) component of the ultrasonic echo due to the motion of the blood vessel wall pass through the detection signal comparing unit 7 and the blood flow velocity calculating unit 8 and the tissue, respectively. In the movement speed calculation unit 9, the blood flow speed and the movement speed of the blood vessel wall are calculated based on the FFT Doppler method.
[0032]
The DSC 12 converts the result of calculating the blood flow velocity and the movement velocity of the blood vessel wall into a video signal. The display controller 13 converts the blood flow velocity and the movement velocity of the blood vessel wall into a display waveform signal on the B-mode image, and outputs the display waveform signal to the monitor 14. FIG. 8 is an example in which the blood flow velocity and the moving velocity of the blood vessel wall are displayed in a waveform on the B-mode image. In the example of FIG. 8, the waveform is displayed on the B mode screen, but may be displayed on another diagnostic mode such as the M mode. Further, in addition to the blood flow velocity and the movement velocity of the blood vessel wall, a change in blood vessel wall thickness, an electrocardiogram waveform (ECG), a heart sound waveform (PCG), and a blood pressure waveform obtained from the movement velocity of the blood vessel wall may be simultaneously displayed. . The display form may be a numerical value, a sound, or a bar graph in addition to the waveform.
[0033]
Although the calculation of the movement speed of the blood vessel wall has been described as being based on the FFT Doppler method, there is another method of performing high-accuracy tracking and displaying a waveform of a minute movement speed in a tissue that moves greatly. According to this method, it is possible to better understand the relationship between the state of the turbulence distribution of the blood flow and the motion of the blood vessel wall.
[0034]
As described above, in the third embodiment of the present invention, the ultrasonic diagnostic apparatus calculates the blood flow velocity and the movement velocity of the blood vessel wall in real time, and calculates the waveform of the blood flow velocity and the movement velocity of the blood vessel wall. Since the waveform is simultaneously displayed on the B-mode image of the monitor, it is possible to measure the blood flow velocity and the blood vessel movement velocity on the cross-sectional image while confirming the deflection angle of the acoustic line.
[0035]
(Fourth embodiment)
A fourth embodiment of the present invention is an ultrasonic diagnostic apparatus that calculates a blood flow velocity and a movement velocity of a blood vessel wall in real time, and displays the blood flow velocity and the movement velocity of the blood vessel wall on a B-mode tomographic image in a superimposed manner. Device. Here, as an example, a case where the blood flow velocity and the movement velocity of the blood vessel wall are displayed in color will be described.
[0036]
The configuration of the ultrasonic diagnostic apparatus according to the fourth embodiment of the present invention is the same as that of FIG. In the ultrasonic diagnostic apparatus shown in FIG. 1, received ultrasonic echoes of a plurality of acoustic lines are separated by a filter 5 and a filter 6. The phase shift (Doppler shift) component of the ultrasonic echo due to the blood flow and the phase shift (Doppler shift) component of the ultrasonic echo due to the motion of the blood vessel wall pass through the detection signal comparing unit 7 and the blood flow velocity calculating unit 8 and the tissue motion, respectively. The data is sent to the speed calculator 9 to calculate the blood flow speed and the moving speed of the blood vessel wall.
[0037]
The DSC 12 converts the result of calculating the blood flow velocity and the movement velocity of the blood vessel wall into a video signal. The display controller 13 converts the blood flow velocity and the movement velocity of the blood vessel wall into a two-dimensional color display signal on the B-mode image and outputs the signal to the monitor 14. In the color display of the blood flow velocity, in addition to the velocity display, dispersion display and power display by the autocorrelation method are performed. Regarding the motion of the blood vessel wall, a change in the blood vessel wall thickness determined from the motion speed of the blood vessel wall is displayed in addition to the speed display, the dispersion display, and the power display.
[0038]
As described above, in the fourth embodiment of the present invention, the ultrasonic diagnostic apparatus calculates the blood flow velocity and the movement velocity of the blood vessel wall in real time, and displays the blood flow velocity and the blood vessel wall on the B-mode tomographic image. The two-dimensional color display is performed according to the movement speed of the subject, so that the blood flow speed, the movement speed of the tissue mainly including blood vessels, and other state parameters can be easily grasped on the cross-sectional image.
[0039]
【The invention's effect】
As is clear from the above description, in the present invention, the ultrasonic diagnostic apparatus, a transmitting unit that transmits an ultrasonic wave from the ultrasonic probe into the living body, and a receiving unit that receives an ultrasonic echo obtained from the living body A delay control means for controlling an acoustic line direction of transmission and reception of ultrasonic waves, a phase detection means for phase-detecting an ultrasonic echo, a filter for removing an ultrasonic echo component from tissue from a phase-detected signal, and a phase detection. A filter for removing an ultrasonic echo component from the blood flow from the signal; a detection signal comparing means for comparing the signal from which the ultrasonic echo component from the tissue is removed with the signal from which the ultrasonic echo component is removed from the blood flow; Blood flow velocity calculating means for calculating a blood flow velocity from a detected signal; tissue movement speed calculating means for calculating a movement velocity of a tissue mainly including a blood vessel wall from a phase detected signal; blood flow velocity and a blood vessel wall Based on the display means for displaying the main tissue movement speed and the comparison result from the detection signal comparing means, the phase of the signal from which the ultrasonic echo component has been removed from the tissue and the ultrasonic echo component from the blood flow have been removed. in so that possible phase separation respective signals, since the configuration and means for controlling the direction of the acoustic line of the ultrasonic wave transmitted and received by the delay control unit, freely deflect the ultrasonic acoustic line direction, blood By separating the ultrasonic echo from the flow and the ultrasonic echo from the tissue mainly containing the blood vessel wall, an effect is obtained that the blood flow velocity and the movement velocity of the tissue mainly containing the blood vessel wall can be simultaneously measured.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an ultrasonic diagnostic apparatus according to first to fourth embodiments of the present invention;
FIG. 2 shows a high-pass filter (HPF) of the ultrasonic diagnostic apparatus according to the first embodiment of the present invention, which removes an ultrasonic echo component from a tissue; A diagram showing an example of removing an echo component,
FIG. 3 is a diagram illustrating an example in which a cutoff frequency of a low-pass filter (LPF) is arbitrarily set according to a phase shift (Doppler shift) component of an ultrasonic echo of the ultrasonic diagnostic apparatus according to the first embodiment of the present invention. ,
FIG. 4A is a conceptual diagram illustrating a state in which the direction of an ultrasonic acoustic line of an ultrasonic diagnostic apparatus according to a second embodiment of the present invention is deflected;
(B) A diagram showing an example of a phase shift (Doppler shift) of the obtained ultrasonic echo.
FIG. 5A is a diagram showing a case where the direction of an ultrasonic acoustic line of the ultrasonic diagnostic apparatus according to the second embodiment of the present invention is orthogonal to the direction of blood flow;
(B) A diagram showing an example of a phase shift (Doppler shift) of the obtained ultrasonic echo.
FIG. 6A is a diagram showing a case where the deflection angle of an ultrasonic acoustic line of the ultrasonic diagnostic apparatus according to the second embodiment of the present invention is increased.
(B) A diagram showing an example of a phase shift (Doppler shift) of the obtained ultrasonic echo.
FIG. 7 is a schematic diagram of a measurement example when blood vessels are not parallel to the body surface of the ultrasonic diagnostic apparatus according to the second embodiment of the present invention;
FIG. 8 is a schematic diagram of an example in which a blood flow velocity and a moving velocity of a blood vessel wall are displayed as waveforms on a B-mode image of the ultrasonic diagnostic apparatus according to the third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ultrasonic probe 2 Ultrasonic transmission / reception part 3 Delay control part 4 Phase detection part 5 Filter 6 Filter 7 Detection signal comparison part 8 Blood flow velocity calculation part 9 Tissue movement velocity calculation part 10 Detection part 11 Gain control part 12 DSC
13 display control unit 14 monitor 15 CPU
16 ECG
17 Blood pressure waveform 18 Ultrasound diagnostic device main body 19 PCG
20 Phase shift of ultrasonic echo from tissue (Doppler shift)
21 Phase shift of ultrasonic echo from blood flow (Doppler shift)

Claims (4)

Transmitting means for transmitting ultrasonic waves from the ultrasonic probe into the living body, receiving means for receiving ultrasonic echoes obtained from the living body, delay control means for controlling an acoustic line direction of transmission and reception of the ultrasonic waves, Phase detection means for phase-detecting an ultrasonic echo, a filter for removing an ultrasonic echo component from tissue from the phase-detected signal, and a filter for removing an ultrasonic echo component from a blood flow from the phase-detected signal. Detection signal comparing means for comparing a signal from which an ultrasonic echo component has been removed from the tissue with a signal from which an ultrasonic echo component has been removed from the blood flow, and a blood flow for calculating a blood flow velocity from the phase-detected signal Velocity calculation means, tissue movement velocity calculation means for calculating the movement velocity of the tissue mainly on the blood vessel wall from the phase detected signal, and movement velocity of the blood flow velocity and the tissue mainly on the blood vessel wall Comprising a display means for displaying, based on the comparison result from said detection signal comparison means, to remove the ultrasonic echo component from the phase with the blood flow signal to remove the ultrasonic echo components from the tissue signal the ultrasonic diagnostic apparatus of phase by pre SL delay control means can be separated respectively, wherein the benzalkonium control the orientation of the acoustic line of the ultrasonic wave transmission and reception. Based on the comparison result from the detection signal comparison means, so that the amplitude of the signal from which the ultrasonic echo component is removed from the tissue and the amplitude of the signal from which the ultrasonic echo component is removed from the blood flow can be separated. the ultrasonic diagnostic apparatus according to claim 1, wherein the benzalkonium control the orientation of the acoustic line of the ultrasonic wave transmitted and received by the delay control means. The blood flow velocity computing means and the tissue movement velocity computing means include means for computing the blood flow velocity and the movement velocity of the tissue mainly containing the blood vessel wall in real time, and the display means comprises the blood flow velocity, 3. The ultrasonic diagnostic apparatus according to claim 1, further comprising means for simultaneously displaying a movement speed of a tissue mainly including the blood vessel wall. 4. The ultrasonic diagnostic apparatus according to claim 3, wherein the display unit includes a unit configured to display the blood flow velocity and the movement velocity of a tissue mainly including the blood vessel wall on a B-mode tomographic image. .

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