JPS58209341A - 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] The present invention relates to an ultrasonic diagnostic apparatus.

In electronic scanning ultrasound diagnostic equipment, especially in its high-speed scanning method, in order to obtain good resolution images at all diagnostic depths from near to long distances, the number of driving transducers and focal length must be adjusted according to the diagnostic depth. It has been proposed that switching the frequency band, the degree of enhancement, and the frequency band should be used. However, if these are switched during signal reception, lines appear on the image due to noise caused by the switching. Therefore, so-called dynamic
A method in which the focus position changes from 2 to 4 positions is often used, but with this method, as the number of switching stages increases, it takes longer to scan one screen, and the frame rate decreases. There is a drawback that it decreases.

The object of the present invention is to eliminate the above-mentioned drawbacks, and in particular to provide a system with good resolution over the entire diagnostic depth from short to long distances in real-time, without switching lines and without reduction in frame rate. An object of the present invention is to provide an ultrasonic diagnostic device that can obtain images of The purpose of this is to provide two sets of focus delay circuits, a reception transducer number switching circuit, a detection and
Increase 1131! IJ path and frequency filter, as well as A/D
A converter is provided in one beam, followed by a sequentially switchable selection circuit through either set, and connected to a two-dimensional storage circuit.

Next, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic block diagram showing one embodiment of the present invention. 11 is a wave transmission drive control circuit, 12 is a vibrator group, 1
This is a 3rd wave reception selection and amplification circuit. In addition, 14 is a focus delay circuit and a reception frequency switching circuit, 15 is a detection and
These are an amplifier circuit, a frequency filter, and a 16 U A/D converter, and as shown in the figure, two sets are connected in parallel to the selection circuit 17. Furthermore, 18 is a two-dimensional memory circuit, 19
U display control circuit, 20 is a display device.

Fig. 2 shows an example of a linear image in which the area is divided into four stages.Based on this, the set values for the number of oscillators, focal length, enhancement degree, and pass frequency band according to the present invention are as follows. Illustrate.

FIG. 3 is a switching timing chart on the upper side. The selection circuit 17 selects group A when ① and ①, and selects group B when ◯ and ◯. In group A's focus delay circuit, reception frequency switching circuit 14-1, detection/amplification circuit, and frequency filter 15-1, the selection circuit 7 is Bffi'
While selecting nl + ! 1 + Gl + f+ and n
3113 + G3 + f3, and the other B f
ill, (D 7 , t - The delay circuit for cass, the reception frequency switching circuit 14-2, the detection/amplification circuit, and the frequency filter 15-2 are set to nz + 12 + G2 while the selection circuit 17 selects group A. + h and n4, 13
, G4 + f<, to reduce time loss due to switching.

According to the present invention, the selection circuit I7 is the A/D converter 16
Since the switching line follows the switching line, noise on the switching line does not occur unlike switching of analog signals. Further, the signal selected by the selection circuit 17 is transmitted to the two-dimensional storage circuit 17 (')
, ■, ■, ■ are written to the memory addresses corresponding to ■.

According to the present invention, the number of driving oscillators, focal length, Jl, 娨1]
When switching the frequency, frequency band, etc. in multiple stages, there is no drop in frame rate, there is no switching line, and images with good resolution can be obtained in real time from short to long distances. The effect is remarkable.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram showing an embodiment of the present invention, FIG. 2 is an example of a linear image in which the entire area is divided into four stages, and FIG. 3 is a timing chart according to the four-stage example according to the present invention. 0 to 14 in the chart shows the focus delay circuit and reception frequency switching
1 path, 15c detection, amplification circuit and frequency filter, 1
6 is an A/D converter, 17 is a selection circuit, and 18 is a two-dimensional memory circuit.

Claims (1)

[Claims] In an ultrasonic diagnostic apparatus that stores and displays an ultrasonic reception signal as a digital two-dimensional image signal, two sets of focusing delay circuits, a reception transducer number switching circuit, a detection/amplification circuit, and a frequency filter are used. An ultrasonic diagnostic apparatus comprising a /D converter, followed by a selection circuit capable of sequentially switching through any one of the sets in one beam, and connected to a two-dimensional storage circuit. .