JPH0296797A - Image diagnosing device - Google Patents

Abstract

PURPOSE:To display a correct gray scale which checks the gradation of the image on a CRT over a long period of time by providing a gray scale luminance inverter which inverts the luminance of the gray scale at every establishment of prescribed conditions. CONSTITUTION:Gray scale data GSD is so sent to and stored in an image memory 4 via the newly added gray scale luminance inverter 10 that the direction of the change from the brightness to darkness or from the darkness to brightness of the luminance is made the same as the direction of the change of the gray scale data DSD or is reverse from the direction of the data GSD. Namely, the gray scale luminance inverter 10 is operated at prescribed time intervals, for example, at every switching of the power source of the device or at every specified time to invert the luminance of the gray scale 11. The correct gray scale 11 is displayed over a long period of time in this way and the correct checking and adjustment of the image gradation are executed.

Description

[Detailed description of the invention] [Industrial application field]

The present invention emits, for example, ultrasonic waves into a living body, receives the reflected waves from within the living body, performs the necessary processing on this received signal, converts the intensity of this processed signal into luminance, and displays it on a CRT. It relates to an image diagnostic device such as an ultrasound diagnostic device that displays an image, and in particular automatically inverts the brightness of a gray scale for checking the gradation of an image on a CRT under predetermined conditions (for example, at a predetermined time interval). The present invention relates to an image diagnostic apparatus that prevents deterioration of a CRT and displays a correct gray scale. Note that in the following figures, the same reference numerals indicate the same or corresponding parts.

[Conventional technology]

FIG. 3 shows an example of the configuration of a conventional device of this type. The ultrasonic probe 1 shown in the figure emits ultrasonic waves to a living body, receives the reflected waves from inside the living body, and outputs the received waves as a reflected signal 1a. The analog processing section 2 performs necessary analog processing such as amplification on this reflected signal 1a, and outputs it as a signal 2a. This analog-processed signal 2a is A/D converted by a digital scan converter 3, and an image is reproduced using this digital signal to create image data. The image data ID obtained here is sent to the image memory 4 and stored therein. On the other hand, grayscale data GSD is generated by the grayscale generator 9 according to instructions from the digital scan converter 3, and this data GSD is generated by the grayscale generator 9.
The SD is similarly sent to the image memory 4 and stored therein. The data ID stored in the image memory 4 in this way
, C; SD is transferred to the shift register 5 one horizontal scanning line at a time in accordance with the timing of the horizontal synchronization signal HS, then converted into a serial signal 5a by the clock CLK, and further converted into an analog image signal 6a by the D/A converter 6. It is converted into and sent to the CRT monitor 7. On the CR7 display surface 7a of the CRT monitor 7, an in-vivo image corresponding to the image data ID obtained using the image signal 6a is displayed on the image display section 8, and in this example, the display surface A grayscale 11 as an image corresponding to the grayscale data GSD is displayed on the right edge of 7a. Here, gray scale refers to a display area in which the brightness is successively changed by a predetermined level, and is arranged in a line in a scale shape to create a scale of brightness gradation, and when performing image diagnosis, the gray scale of the image is The tone is checked and adjusted by referring to the brightness IlI tone value of this gray scale.

[Problem to be solved by the invention]

However, in the above-mentioned device, the high-luminance part in the reference gray scale is always at the same location, for example at the bottom of the gray scale 11 in the example of FIG. There was a problem in that the phosphor screen deteriorated and the correct gray scale display could not be obtained when used for a long period of time. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an ultrasonic diagnostic apparatus that prevents deterioration of a CRT in a high-luminance gray scale part and displays a correct gray scale over a long period of time.

[Means to solve the problem]

In order to solve the above problems, the image diagnostic apparatus of the present invention includes a grayscale luminance inverter that inverts the luminance of a grayscale for checking the gradation of an image on a CRT when a predetermined condition is met.

[For use]

For example, by inverting the gray scale brightness at a predetermined time interval using a gray scale brightness inverter, the brightness can be reduced to two levels, bright and dark, in a display location where the brightness has always been high.
Since the conditions are repeated alternately, deterioration of the fluorescent surface of the CRT is prevented and uniformity is achieved, so that the correct gray scale is displayed over a long period of time.

【Example】

The present invention will be explained in detail below using FIG. 1 and FIG. 2M. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and corresponds to FIG. 3. In FIG. In FIG. 1, an ultrasonic probe 1 shown in the same figure emits ultrasonic waves to a living body and receives the reflected waves from inside the living body. The analog processing section 2 performs analog processing such as increase 11 of the reflected signal 1a. The analog-processed signal 2a is subjected to A/D conversion and image reproduction by the digital scan converter 3, and an image data ID is created. The image data ID obtained here is sent to the image memory 4 and stored therein. On the other hand, digital scan converter 3
According to the instruction, gray scale data GSD is created by the gray scale generator 9. Up to this point, the apparatus is exactly the same as the apparatus shown in FIG. However, in the present invention, the grayscale data C
5D further changes the brightness from bright to dark (or from dark to bright) via a newly added grayscale brightness inverter 10.
The direction of the change is made to be the same as that of the gray scale data GSD as described later, or is sent to the image memory 4 as gray scale data GSDI, which is stored in the opposite direction. The data ID and GSDI of the image memory 4 are transferred to the shift register 5 one horizontal scanning line at a time according to the timing of the horizontal synchronizing signal H3, then converted into a serial signal 5a by the block CLK, and further converted into an image signal by the D/A converter 6. It is sent to the CRT monitor 7 as 6a. In this way, an image corresponding to the image data 10 is displayed on the CR, T display surface 7a of the CRT monitor 7, and in this example, grayscale data GSDI is displayed on the right edge of the display surface 7a. Grayscale 1 as an image corresponding to
1 is displayed. When performing image diagnosis, set the image gradation to grayscale 1.
The checking and adjustment with reference to the brightness gradation value of 1 is the same as in the case of FIG. 3 already described. Here, in the present invention, the gray scale brightness inverter 10 is operated at predetermined time intervals, for example, each time the power supply of the device is turned on and off, or at regular intervals, and the gray scale brightness inverter 10 is activated.
Inverts the brightness of FIG. 2(A) shows a grayscale display in the normal case, and FIG. 2(B) shows a grayscale display in the case of once inversion. By inverting the brightness of the gray scale in this way, within this gray scale 11, the image part with high brightness that was at the same location in the conventional amount is newly moved to the image part where the brightness was also low in the conventional amount. , by repeating such reversals alternately/)CJ? Deterioration of the fluorescent surface of T is prevented and it is made uniform, so that the correct gray scale is displayed over a long period of time. Although this embodiment describes an ultrasonic diagnostic device,
The present invention can be applied to general image diagnostic apparatuses that display grayscale, such as X-ray CT apparatuses and magnetic resonance CT apparatuses.

【Effect of the invention】

According to the present invention, in image diagnosis using an image diagnosis device, the brightness of the gray scale is inverted each time the device is powered on and off or at a predetermined time interval, so that the correct gray scale can be displayed for a long period of time. ,
It becomes possible to check and adjust the gradation of images more accurately, which is highly effective in making correct diagnoses.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram showing the configuration of an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the operation of the present invention, and FIG. 3 is a block circuit diagram of a conventional device corresponding to FIG. 1. It is. 1: Ultrasonic probe, 2: Analog processing unit, 3: Digital scan converter, 4: Image memory, 5: Shift register, 6: D/A converter, '7: CRT monitor, 1a: CRT display surface, 8: Image display unit, 9 Nigerley scale generator, 1O Nigerley scale brightness inverter, I
J Niger scale.

Claims (1)

[Claims] In a diagnostic device that performs necessary processing on a signal received from within a living body, converts the intensity of the processed signal into luminance, and displays the image on a CRT, a gray scale is used to check the gradation of the image on the CRT. An image diagnostic apparatus comprising a gray scale brightness inverter that inverts brightness each time a predetermined condition is met.