JPS633845A - Ultrasonic diagnostic apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an ultrasonic imaging device configured to obtain a reflected image of an object by transmitting and receiving ultrasonic waves, and is particularly suitable for medical diagnosis. The present invention relates to an ultrasonic diagnostic apparatus that provides spatial distribution information of interlocking speed.

[Conventional technology]

Attempts to provide detailed information on the spatial distribution of intracorporeal velocity in ultrasound diagnosis include the Japanese Society of Ultrasonics in Medicine Lecture Paper Raku 40-C-15 (1982) and Ruruiwa 4l-B-47 (
1982), all of which attempt to detect and display the component in the ultrasonic beam direction of each component of the interlocking velocity.

[Problem that the invention seeks to solve]

However, knowing only the interlocking velocity component in one direction is insufficient to know the actual state of motion within the object.

1\ :'f: Trowel, the purpose of the present invention is to improve the internal reflector 21! An object of the present invention is to provide an ultrasonic diagnostic apparatus having a higher diagnostic function by providing a function of simultaneously detecting not only the component in the ultrasonic beam direction but also other components regarding the moving velocity.

[Means and operations for solving the problem] In accordance with the above object, the present invention provides means for simultaneously detecting a component in the ultrasonic beam direction and a component in the scanning direction, and a means for simultaneously detecting a component in the ultrasound beam direction and a component in the scanning direction, regarding the interlocking speed of one internal reflector. An ultrasonic diagnostic apparatus is proposed, which includes means for displaying obtained information.

More specifically, by scanning with a linear scanning ultrasonic probe, the reflection sign from a certain reflector is recorded in a two-dimensional memory, and the signal (echo spot) of this reflector is recorded in the memory. The two-dimensional momentum of the reflector is determined by detecting the movement of its position.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.

FIG. 1 is a block diagram of the system configuration of one embodiment. A transmitting/receiving circuit 2 controlled by a scan control circuit 3 transmits and receives pulsed ultrasonic waves via an array type multi-scanning probe 1 . The obtained signal is processed according to a signal processing process similar to that of a normal B-mode imager.
According to instructions from the scan control circuit 3, the data is written to the corresponding address in the two-dimensional memory 4 or 5.

The above part has the same configuration as a conventional ultrasonic imaging device, but in order to effectively implement the present invention, the azimuth resolution ΔX must be as high as the distance resolution Δy. . ΔX and Δy are.

Each is given by the following formula, so Δx ''= 2λY r / D= 2λF...
...(1) Δy = nλ/2 ・
・・・・・・・・・(2) The following conditions are required.

F-n/4 ・・・・・・・・・(
3) Here, F is the F number of the imaging system, n is the pulse length counted in wavelength λ, YF is the focal length, and D is the imaging aperture.

At corresponding addresses in the two-dimensional memories 4 and 5, echo signals at the same position having a constant time difference ΔT corresponding to the difference in their imaging times are written in the form of an envelope signal or a carrier wave signal. 2D memory 4 and 5
Signals S4 (X, Y) and Ss read from
(X, Y) is a measurement position signal (Xo) from the interlocking speed measurement control circuit 6.

Yo), the window function W with that as the origin
(X Xo , Y Yo ) K is windowed at 8 and written to two-dimensional memories 9 and 10 as signals S9 (X, Y) and 5ro (X, Y), respectively.

8G (X Xo, Y Yo) = ff 84 (X
JY)W(XXo,YYo)dxdY・
・・・・・・・・・・・・(4) St o (X Xo
, YYo)-4Ss (X, Y)W(X-X
o,YYo)dXdY・・・・・・・・・
...(5) Furthermore, the integral Fi84 and Ss and W (
X Xo , Y Yo) is executed for the entire range in which it is not zero. Next, the signal 5s from the two-dimensional memories 9 and 10
(X, Y) and Sto (X, Y) are read,
Two-dimensional cross-correlation function C (Xt, Y+) between the two
is calculated according to the following formula:

C(X+,Y+)=J,γSq(X,Y)S
t o (X+Xl, Y+Y] )dXdY
・・・・・・(6) Two-dimensional mutual function C
Maximum peak position (Xp, Yp) of (X+, Yl)
), the interlocking velocity vector V to be found is (X
o, Yo) is obtained as follows.

v(Xo, Yo)=(v-,'/a)=(Xp/Δ
T, Yp /ΔT) (7) Display data is calculated by 13 from the interlocking velocity vector v (Xo, Yo) according to signals from the circuit 12 for specifying the output mode and the direction of movement of interest, and the two-dimensional image umbrella is (Xo.

Yo) is written to the address corresponding to the address. As a method of displaying the interlocking speed data, for example, a method of associating the magnitude of the speed V with the brightness in the color tone of the movement direction θ given by the following formula, v=V77d77 ・・・・・・・・・・・・・・・
(8) A method of associating the two vice versa, or a method of specifying the movement direction of interest U and associating the velocity component W in that direction given by the following equation with color tone or brightness or a combination thereof, etc. Various methods are possible.

w=v−u (・inner product) ・・・・・・(lO
) Through the above steps, a two-dimensional distribution of two-dimensional interlocking velocity vectors can be obtained as an image. It goes without saying that the integration of equations (42 to (6)) is performed by numerical integration processing in concrete signal processing.

〔Effect of the invention〕

As described above, according to the present invention, the interlocking velocity of objects inside the body can be detected as a two-dimensional vector, and the two-dimensional distribution can be displayed as an image. By providing such information that could not be obtained in the past, it becomes possible to diagnose the human body etc. using more advanced ultrasound, and the effects of the present invention on medicine and industry are extremely large.

In the above explanation, a play-shaped electronic scanning probe is used to detect the interlocking velocity two-dimensional vector, and its second
Although the case of displaying the dimensional distribution has been described, the scope of application of the present invention 8 is not limited to this, but detects the interlocking speed 3-dimensional vector using a system capable of 3-dimensional scanning, and displays the 3-dimensional distribution. This also applies when using Rurui or mechanically scanned probes.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention. Agent: Patent attorney Masaru Ogawa. (,tsu,・ ・−)

Claims (1)

[Claims] 1. In an ultrasonic imaging device configured to obtain a reflected image of an object by transmitting and receiving ultrasonic waves, a component of the motion velocity of the reflector in the ultrasonic beam direction and a component in the scanning direction An ultrasonic diagnostic apparatus characterized by comprising means for simultaneously detecting. 2. The device according to claim 1, comprising a mechanism for displaying the direction and magnitude of the interlocking speed at a position on the two-dimensional screen corresponding to the detected position by color tone, brightness, or a combination of both. An ultrasonic diagnostic device characterized by: 3. In the apparatus according to claim 1, means for inputting the direction of interest of the movement speed, and the value of the direction of interest component of the movement speed corresponds to the detected position by color tone or brightness or a combination of both. An ultrasonic diagnostic apparatus characterized by comprising a mechanism for displaying information at a position on a two-dimensional screen.