JPS6150556A - 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 <Industrial Application Field> The present invention relates to an ultrasonic diagnostic apparatus, and more particularly to a mechanical sector type ultrasonic diagnostic apparatus in which a transducer is mechanically oscillated.

Conventional technology> Conventionally, in a mechanical sector type ultrasonic diagnostic device in which a transducer makes a oscillating motion, the motor rotates at a constant speed, and the rotational movement +h of the motor is converted by a link arrangement to generate a transducer. is configured to perform a rocking motion. In such an ultrasonic diagnostic apparatus, the motor that drives the transducer rotates at a constant speed.In this case, the speed of the oscillating motion of the transducer on the forward and return trips differs depending on the nature of the link structure, and furthermore,
In each stroke of the oscillator on the outward and return trips, the motion does not become uniform at the moment t when acceleration occurs.

Therefore, in order to excite the vibrator at equal intervals, that is, at every equal displacement angle, during sector scanning, the displacement angle of the vibrator must be accurately detected, and a high-resolution potentiometer or mechanical In addition to requiring a cog, etc., the configuration of the control circuit becomes complicated.

<Problems to be Solved by the Invention> The present invention has been made in view of the above-mentioned points, and includes the following:
To provide a mechanical sector type ultrasonic diagnostic device that can automatically scan at equal intervals (equal angular intervals) without sequentially detecting the displacement angle of a vibrator and determining excitation timing during rocking motion. With the goal.

Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention provides a mechanical sector type ultrasonic diagnostic apparatus in which a transducer is oscillated. Each time has a memory that stores each time difference in advance, and a control circuit that outputs a trigger signal to excite the vibrator at equal intervals based on each time or each time difference stored in the memory. It is set up.

<Embodiments> Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of an ultrasonic probe according to an embodiment of the present invention, and FIG. 2 is a side view thereof. This vibrator 5 performs a single oscillating motion as shown by arrow 4 through a link structure by constant rotation in three directions.
It is housed in a case 7 together with an ultrasonic medium 6 such as a liquid. Reference numeral 8 designates a bot/yometer for detecting the start position (angle of the start position) of sector scanning as described later, 9 an endless belt, 10 a permanent case, and 11 a seal.

FIG. 3 shows a block 1lV of the ultrasonic diagnostic apparatus 18 of the present invention.
) is a completed diagram. In the figure, 12 is a clock pulse generation circuit, 13 is a ROM as a memory in which each time or each time difference required to displace the vibrator 5 at equal intervals, that is, equal angular intervals, is stored in advance, and 14 is stored in the ROM 13. 1iii. A control circuit that outputs a trigger signal for exciting the vibrator 5 at regular intervals based on each time or each time difference; 16 is an image memory for storing the video signal from the wave transmitting/receiving circuit 15, and 17 is an image display based on the video signal from the image memory 16. This is a display device such as a CRT.

Next, the ultrasonic diagnostic apparatus 16 having the above configuration
1 Description of Operation 1 In the ultrasonic diagnostic apparatus 18 of the present invention, the oscillating motion of the transducer S when the motor 2 is rotating at a constant speed is analyzed in advance, and the displacement angle of the transducer 5 is set at equal intervals. The time difference is calculated and stored in the ROM 13.

For example, the time required to start the rocking motion and displace it by 1 degree is determined, and then the time required to displace it by 1 degree is determined.Sequentially, the time required to make the displacement at equal intervals is determined. and store it in the RO5i13. During scanning, the motor 2 is rotated at a constant speed, and the position (angle) of the sector scan on the forward path is determined by the
Detected by.

After that, the control circuit ``i4;
Based on this stored information, the clock pulse generation circuit 1
It counts the pulses from 2 and outputs a trigger signal for exciting the vibrator 5 at equal intervals. The wave transmitting/receiving circuit 15 can excite the vibrator 5 to perform sector scanning using the trigger signals outputted from the control circuit 14 at irregular intervals in time. The reflected wave from the object is received by the transducer 5, and the 222 signal from the transducer 5 is sent to the wave transmitting/receiving circuit 15.
After signal processing is performed in , the image is displayed on the display 17 via the image memory 16 . The scanning of path a is also carried out in the same manner after the tart angle is detected by the potentiometer 8.

In this way, the transducer S is excited at equal IJl intervals based on the information stored in the ROM 13 in advance, so it is easier to inspect only the scanning start position, and all the transducer positions can be accurately determined as in the conventional method. There is no need to output I'I2 to Ru.

<Effects of the Invention> As described above, according to the present invention, there is provided a mechanical sector type ultrasonic diagnostic apparatus that oscillates a transducer; Each time difference is stored in advance in the memory, and a control circuit outputs a trigger signal for exciting the vibrator at equal intervals based on each time difference stored in the memory. Because of this, the transducer can be excited at equal intervals without detecting the displacement angle of the transducer as in the conventional method, and this allows the ultrasonic probe and control circuit to be configured as cylindrical elements. hru.

[Brief explanation of the drawing]

FIG. 1 is a front view of an ultrasonic probe according to an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a block diagram of an ultrasonic diagnostic apparatus 18 of the present invention. DESCRIPTION OF SYMBOLS 1... Ultrasonic probe, 2... Motor, 5... Vibrator, 13... ROM, 14... Control circuit.

Claims (1)

[Claims] (1) In a mechanical sector type ultrasonic diagnostic apparatus that makes a oscillating motion of a transducer, there is a memory in which each time or each time difference required for displacing the transducer at equal intervals is stored in advance; An ultrasonic diagnostic apparatus comprising: a control circuit that outputs a trigger signal for exciting the vibrator at equal intervals based on each of the times or time differences.