JPH067829B2 - Ultrasonic diagnostic equipment - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an ultrasonic diagnostic apparatus having a function of capturing a VTR reproduced image in a frame memory and freezing it.

[Technical Background of the Invention] Many ultrasonic diagnostic apparatuses have a function of loading a VTR reproduced image into a frame memory and freezing it. Second
The figure shows a circuit configuration of a reproduction image processing apparatus for processing a VTR reproduction signal of such an ultrasonic diagnostic apparatus. In the figure, a is a video tape recorder, b is an A / D converter for converting a reproduced image signal from the video tape recorder into a digital signal, and c is a sync separation circuit for extracting a sync signal from the reproduced image signal, and its periodic signal. Is sent to the system controller d and also sent to the A / D converter b to be used for various controls. e is an S / P converter that converts a series digital signal output from the A / D converter b into a parallel signal, f is a frame memory that stores a reproduced image signal of one frame, and g is read from the frame memory A P / S converter that converts parallel image reproduction signals into series signals, h is a D / S converter that converts digital image reproduction signals into analog signals
A converters h and i are television receivers, and j is a mode changeover switch for changing over the mode to the real mode.

This device separates a sync signal from a VTR image signal when the mode changeover switch j is switched to the freeze mode, converts the image signal into a digital signal in synchronization with the sync signal, and further converts the image signal into a serial / parallel signal. Write sequentially to f. An image signal for one frame is written in the frame memory f, and after the writing for the one frame is completed, the reading operation is started. Frame memory f
Further, the image signal is read in parallel for several data, converted into parallel to serial, converted into an analog signal by D / A conversion, further added with a standard television broadcast synchronization signal, and added to the television receiver i. The VTR reproduction image signal for the frame is frozen. The freeze was done in this way.

By the way, there are generally scroll display and moving bar display for displaying the M-mode image and the biological signal. And
When performing scroll display, the amount of movement of the image in the time axis direction is adjusted so that the movement of the image looks smooth.
It is divided for each (vertical synchronization). When such a scroll-displayed VTR playback image is frozen in one frame, the position of the image in the time axis direction differs for each field, so that the image of the first field and the image of the second field are displaced in the time axis direction. The image was doubled. This makes the image hard to see, so
Even if the data of one frame memory is stored in the frame memory f, when it is read out, the data is read out in the first field during the second field.
The same data was output during the field.

[Problems of Background Art] By the way, in order to reproduce the same data in the first field and the second field, it goes without saying that
The resolution of the freeze image in the Y direction (vertical direction, so to speak) is half that of a general frame freeze image. Therefore, the quality of the frozen image was significantly lower than that of the VTR reproduced image in real time.

[Object of the Invention] The present invention has been made to solve the above problems,
It is an object of the present invention to prevent deterioration of the image quality of a VTR freeze image and maintain the same image quality as a real-time VTR reproduced image.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention records a status signal for identifying a scroll or a moving bar together with a video signal showing an ultrasonic image during recording on a VTR,
When freezing during VTR playback, the status signal is V
It is separated from the TR playback video signal, field freeze is performed when scrolling, frame freeze is performed when moving bar, and switching between field and frame is automatically performed, and freeze image is displayed when moving bar is displayed. This is to prevent the image quality from deteriorating.

[Examples of the Invention] The present invention will be described below with reference to the illustrated examples.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 1 is an ultrasonic probe, 2 is a transmission / reception circuit, and an electric signal generated from the transmission / reception circuit 2 is converted into ultrasonic waves by the ultrasonic probe 1 and radiated into the living body. Then, the emitted ultrasonic waves are reflected in the living body and returned to the probe 1. The probe 1 converts the returned ultrasonic wave into an electric signal. The electric signal is amplified by the transmission / reception circuit 2. 3 is a DSC (digital scan converter), and 4 is a changeover switch. When it is switched to a side, the video signal detected by the probe 1 is recorded, and when it is switched to b side, it is in a freeze reproduction state. . 6 is a TV monitor.

When the changeover switch 4 is set to the a side,
The video signal reflected in the living body and converted into an electric signal by the probe 1 is amplified by the transmission / reception circuit 2, transferred to the DSC 3, amplified by the video amplifier 5, and reproduced by the TV monitor 6. The video signal output from the DSC 3 is added by the adder 8 to a status signal generated by the status signal generation circuit 7 and indicating the status of scroll display or moving bar display, amplified by the video amplifier 9, and input to the VTR 10. To be done. In this way, DS
The video signal output from C3 is recorded on the VTR 10.

Reference numeral 11 is an A / D converter for converting the video reproduction signal from the VTR 10 into a digital signal, 12 is a serial / parallel converter, 13 is a frame memory, 14 is a parallel / serial converter, and 15 is a D / A converter. It is input to the changeover terminal of the changeover switch 4. Reference numeral 16 is a system controller, 17 is a sync separation circuit for separating a sync signal from a video reproduction signal from the VTR 10, 18 is a status signal separation circuit for separating the status signal from a video reproduction signal from the VTR 10, and 19 is a frame / frame
A field switching circuit, 20 is a freeze switch that is pushed to bring it into a freeze state.

To freeze the reproduced video signal output from the VTR, do the following.

The changeover switch 4 is changed over to the b side and the freeze switch 20 is turned on. When the freeze switch 20 is turned on, the playback video signal output from the VTR 20 is timing-controlled by the sync signal output from the sync separation circuit 17, converted into a digital signal by the A / D converter 11, and further by the S / P conversion circuit 12. The data is converted into parallel data and then written in the frame memory 13. The reproduced video signal output from the VTR 20 is also input to the state signal separation circuit 18, and the separation circuit 18 is timing-controlled by the synchronization signal output from the synchronization separation circuit 17 to separate the synchronization signal from the reproduction video signal. .

The video reproduction signal written in the frame memory 13 is controlled by the system controller 16 so as to be sequentially read out as parallel data for several data, converted into series data by the P / S conversion circuit 14, and further D /
It is converted into an analog signal by the A converter 15, and a sync signal is added to it to be a standard TV signal. This standard TV
The signal is amplified by the video amplifier 5 and then input to the TV monitor 6, and the freeze image of the VTR is displayed on the monitor 6.

In the freeze mode, the frame memory 13
Read address data of the system controller 16
Is input to the frame / field switching circuit 19 to switch to the field in the scroll display state according to the status signal, and to the frame in the case of the moving bar to return to the system controller 16 and read based on the address data. . By doing so, field freeze and frame control are automatically performed.

That is, according to the present invention, a status signal indicating the status of scroll display or moving bar display is recorded together with image data at the time of recording on a VTR, and the status signal is automatically detected at the time of playback freeze, and the frame memory 13 The field read or the frame read is selected for reading the video reproduction signal. And there is no time lag when moving bars,
When freezing the moving bar image, one frame image can be displayed, so the resolution in the Y direction can be doubled compared to the pause image of the VTR and the conventional freeze image, and a high-quality image can be obtained. To be

[Advantages of the Invention] As described above, according to the present invention, it is possible to improve the resolution in the Y direction of the video playback freeze image of the VTR when displaying the moving bar, and improve the image quality.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional example. 7 ... Status signal generating circuit, 10 ... VTR, 11 ... A / D converter, 12 ... S / P converter, 13 ... Frame memory, 14 ... P / S converter, 15 ... D / A converter, 16 ... System controller, 17 ... sync separation circuit, 18 ... status signal separation circuit, 19 ... frame / field switching circuit.

Claims (1)

[Claims] 1. An ultrasonic diagnostic apparatus having a function of freezing a reproduced display image of a VTR, and a state signal generating means for generating a state signal indicating whether the ultrasonic image is a scroll display or a moving bar display during VTR recording, A state signal separating means for separating the state signal from the reproduced video signal during VTR reproduction, a frame memory for storing one frame of the reproduced video signal, and scrolling of signal reading from the frame memory based on the state signal during VTR freeze reproduction. Switching means for field reading when displaying, frame reading when moving bar display,
An ultrasonic diagnostic apparatus comprising: a display unit for displaying a VTR reproduced image.