JPS6037893B2 - acoustic image display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acoustic image display device that scans each cross section of a test object with an acoustic beam and displays an acoustic image of each cross section of the test object on a display screen.

Conventionally, this type of acoustic image display device moves a scanning acoustic beam one-dimensionally to detect the reflected acoustic beam from inside the object to be inspected, and uses the moving direction of the scanning acoustic beam as one axis to detect the traveling direction of the scanning acoustic beam. A so-called B-scan and C-scan acoustic image display device, which displays an acoustic image of a plane formed with the other axis, that is, a cross section, has been known.

In addition, there is a so-called TM scan acoustic device that moves a scanning beam two-dimensionally, detects reflected acoustic beams from a predetermined surface inside an object to be inspected, that is, a cross section, by time control, and displays an acoustic image of the cross section. Image display devices are also known. The device of the present invention is an improvement on these devices,
The improvement is that the brightness or gradation is changed for each acoustic image of each cross section, and the acoustic image of each cross section is displayed as an acoustic image that is translated in a certain direction.

The present invention will be described below with reference to the accompanying drawings.

In the following explanation, the scan mode will be specifically explained as B scan. 1 in FIG. 1 is a subject.

The subject 1 has a conical hole whose diameter decreases along the depth direction. The ultrasonic scanning beam moves to lines AB, A'B', A"B" on the upper surface ABA"B" of the subject.

Therefore, equally spaced ABCD, A'B'C'〇, A''B
An acoustic image of the cross section of "C"〇' is obtained. Acoustic images a, a', a'' of each cross section are obtained as shown in FIG. 2. In the conventional ultrasonic image display system, the brightness and contrast of each fin were equal.

According to the acoustic image display of the present invention, the brightness or gradation level of the acoustic image is changed for each cross section of the object. FIG. 3 shows ultrasonic images a, a', a'', and shows an example in which the brightness level is increased as the cross-section in the depth direction increases, and therefore the brightness of the image decreases.Next, , such a modification that can change the brightness and gradation will be explained using the electrical block diagram shown in Fig. 4. In Fig. is guided and drives the ultrasonic transducer 32.

This ultrasonic transducer 32 is assumed to be a so-called one-dimensional array ultrasonic transducer in which a large number of vibration elements are arranged in a line, and each vibration element is connected to a monitor 36 and a memory scan converter 37, which will be described later.
are sequentially driven by periodic signals. The reflected wave from the subject is detected by the transducer 32. This detection signal is amplified and detected by an amplification/detection circuit 34 and then sent to a monitor cathode ray tube 36 and a memory scan converter 37. By performing this operation for each vibration element of the one-dimensional array transducer, the monitor 36 and memory scan converter 3
7, an ultrasound image of the ABCD cross section is formed.

A formed on the memory scan converter 37
The ultrasonic image of the BCD cross section is scanned by a readout scan converter 37'. The center of the scan center of the scan converter 137' when reading out the ultrasound image of the ABCD section coincides with the center of the memory scan converter 137. The output of this scan converter 37' is input to a cathode ray tube 41 via a circuit 40 such as a brightness modulation circuit and a gradation adjustment circuit, each of which is set at a certain level value.
Therefore, an ultrasound image of the ABCD cross section is displayed on the cathode ray tube 41. Next, the one-dimensional array transducer 32 is placed on line A'8 in FIG. At this time, the amount of movement of the transducer 32 is detected by the detector 33. By this detection signal, the ultrasound image of the ABCD cross section formed on the monitor 36 and the memory converter 37 is erased. Furthermore, this detection signal is input to the control circuit 42 that controls the scanning area of the readout converter 37', and the center of the scan range of the readout converter 37' is moved along the Z axis in accordance with the amount of movement of the transducer. Move by a certain amount in a direction. The amount of movement of the center of the scanning castle is non-linear with respect to the amount of movement of the transducer 32. Further, the detection signal increases the set level of the brightness modulation circuit 40. Ultrasonic scanning is performed on this AB' line, and the monitor 36 and memory converter 3 are scanned as before.
7, an ultrasonic image of the cross section A'B'〇D' is formed. Then, as before, it is read out by the readout scan converter 37' to form an ultrasonic image of the section A'B'〇D' on the cathode ray tube 41. However, since the readout scan converter 37' scan center is moved in the Z-axis direction by the control circuit 42, the ultrasound image of the ABC'〇 section on the cathode ray tube 41 is different from the ultrasound image of the previous ABBD section. It has been moved in the Z mouse direction. Furthermore, since the brightness level is high, an ultrasonic image with low brightness can be obtained. Next, the one-dimensional array transducer 32 is further moved by equal distances and placed on line A″B″.

As a result, the center of the scan area of the readout scan converter 1 moves in the Z-axis direction again. This amount of movement is nonlinear. In other words, for line AB, if the scan center is the cutting coordinate (0,0), then for A'B', (
1.8, 1.8), (2.2, 2.2) for A″B″
It is. Also, the brightness level can be further increased. Therefore, the ultrasonic images a, a' of each cross section displayed on the cathode ray tube 41
, a'' are moved in parallel in a non-linear manner in the Z-axis direction, and the brightness is reduced, despite the equidistant movement of the one-dimensional array transducer, as shown in FIG.
According to the present invention, the brightness or gradation level of the acoustic image for each cross section is changed in accordance with the distance between each cross section and displayed sequentially. The cone can be displayed in an exaggerated manner by changing from a dark image to a light image in order, thereby giving the viewer a stronger impression that it is conical rather than cylindrical.

Furthermore, since the acoustic image of each cross section is displayed moved in a predetermined direction, it becomes easier to see.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a subject, Figure 2 is a diagram showing an acoustic image obtained with a conventional device, Figure 3 is a diagram showing an acoustic image with varying brightness levels, and Figure 4 is a diagram showing an apparatus of the present invention. FIG. 5 is a block diagram of the electric circuit of FIG. 4, and FIG. 5 is a diagram showing an acoustic image obtained by the apparatus of FIG. In the figure, 32 is an ultrasonic transducer, 33 is a cross-sectional position detector, 37 is a scan converter, 4 brightness level setting circuits, and 41 is a cathode ray tube. Traditional drawing, grandson drawing, 2nd drawing, killing drawing, 4th drawing, Tsutomu drawing

Claims (1)

[Claims] 1. In a device that scans each cross-section of the test object with an acoustic beam and displays the acoustic image of each cross-section of the test object by moving it in parallel along a certain direction on the display surface, this device also scans the cross-section of the test object. It has means for detecting the position of the cross section to be examined, and means for giving each predetermined brightness or gradation level to the acoustic image of each cross section, and the brightness of the acoustic image for each cross section is determined based on the detected value of the detecting means. Alternatively, an acoustic image display device is characterized in that the gradation level is changed and displayed in accordance with the distance between each cross section.