JPS63189130A - Medical image recording 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 a medical image recording device, and particularly to a medical image recording device that records and records image data obtained by a medical image diagnostic device and biological information data obtained by a biological phenomenon measuring device. This invention relates to a device for reproduction.

[Conventional technology]

2. Description of the Related Art A medical image diagnostic apparatus injects radiation such as X-rays, ultrasonic waves, etc. into a subject as an energy medium, processes the output information, and converts it into an image. By the way, when the area to be examined by a medical image diagnostic device is a moving organ such as the heart, the medical image diagnostic device obtains information inside the subject and at the same time obtains biological information based on the energy emitted by the subject itself, such as the heart. The electrical information is extracted using a biological phenomenon measuring device such as an electrocardiograph,
Images from a medical imaging diagnostic device with reference to that electrocardiogram information.

The data is processed to improve the image quality. An example of this is Digital Subtraction Angiography.
n Angiography) device ID (hereinafter referred to as D,
There is an electrocardiogram-gated imaging method (referred to as S, A device).

[Problem that the invention seeks to solve]

Conventionally, the above-mentioned biological information has been electrically processed and converted into a signal that can be displayed in waveform, and has been displayed on a video display medium together with the video of a medical image diagnostic apparatus, as shown in FIG. 9. As mentioned above, in the S and A devices, etc., images are used as diagnostic information.

A recording/reproducing device, such as a VTR (Video).

Recording is performed using Tape Recorder (Tape Recorder).

The X-ray imaging mode of the DSA apparatus can be roughly divided into the following two imaging modes.

(a) Video mode = continuous irradiation of X-rays to the subject, 3
A mode that acquires images one after another at 0 frames/second. (In this case, X-rays may be emitted in pulses at 30 times/second.) (b) Still image mode: A mode in which Xa is emitted in pulses at 15 times/second or less and images are obtained at 15 flesim/second or less. Usually, a rate of about 0.5 to 4 frames/second is often used.

On the other hand, there are the following two recording modes for a VTR.

(a) Normal recording = A mode in which images obtained at 30 frames/second are recorded directly on the VTR.

(b) Time compression recording: A mode in which images obtained at 15 frames/second or less are temporarily stored in memory, and then read out at 30 frames/second and recorded on the VTR.

The shooting modes of these DSAI devices and the recording modes of VTRs are generally a moving image mode and a normal recording mode, and a still image mode and a time compression recording mode. (See Fig. 4 and 5rJA) Conventionally, as a method for recording images from a medical image diagnostic device and waveforms from a biological phenomenon measuring device using a VTR.

A method has been used in which the display screen of a CRT device, which is a display device of a medical image diagnostic apparatus, is recorded as it is.

In this method, biological phenomenon waveforms are recorded as continuous waveforms over time along with recorded images. (The conceptual diagram is shown in Figure 8.) Furthermore, when the recorded data is reproduced, the image and waveform are reproduced at the same time, as shown in Figure 9, and it is impossible to reproduce only one of the data. there were. For this reason, image data would be lost in a portion where one image and the waveform overlapped.

Furthermore, as mentioned above, biological phenomenon waveforms recorded as continuous waveforms are inconvenient when VTR images are used as still image files.

Therefore, the present invention records images of a medical image diagnostic apparatus and biological phenomenon waveforms in a unified waveform format in both the above-mentioned normal recording mode and time compression recording mode,
It is an object of the present invention to provide a medical image recording device that can reproduce images and waveforms separately.

[Means for solving problems]

The means to solve the above problems and achieve the objective is to use a medical image diagnostic apparatus that injects an energy medium into the subject and extracts the information provided by the energy medium as an image, and a system that continuously transmits the energy information emitted by the subject itself. A biological phenomenon measuring device that extracts the signal as a signal and electrically processes the signal to visualize it, and a display medium that displays information obtained by the medical image diagnostic device and information obtained by the biological phenomenon measuring device on the same video display medium. In a medical image recording device, the recording device includes a display device that simultaneously displays images, and a recording device that records and reproduces images displayed on the display device, wherein the recording device records one recorded image of an image obtained by a medical image diagnostic device. The apparatus is characterized in that a waveform recording means is provided for time-compressing and cutting the continuous signal obtained by the biological information processing device and recording it as a corresponding signal.

[Effect]

Continuous time-series signals from the living body measured by the biological phenomenon measuring device are subjected to waveform processing by the waveform recording means, and the waveforms of the past several seconds are sequentially stored as the latest data. This memorized waveform is associated with each recorded image obtained by the medical image diagnostic apparatus and is sequentially recorded in the recording device along with the recorded images.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a schematic block configuration diagram when the present invention is applied to the above-mentioned DSA device. In FIG. 1, 1 is an X-ray high voltage device, 2 is an xi tube device, 3 is a subject, 4 is an X-ray image intensifier, 5 is a television camera, 6 is an A/D converter, and ALU (Arithmetic and Log
ic Unit ), etc., 7 is an electrocardiograph, 8 is a waveform processing unit which converts the electrocardiographic signal from analog to digital, buffers it, and displays the waveform for each television frame. A display control unit 9 converts the waveform data into bitmap data, combines this with image data from the image data calculation unit 6, performs D/A conversion, and displays the data on the monitor 10. 11 is a VTR interface section, which converts waveform data into D/A and outputs it to VTR 12, or vice versa.
The waveform reproduced by 2 is A/D converted, the VTR jitter is corrected by the time base collector, and the waveform processing unit 8
13 is a central control unit which has a built-in CP013g.

FIG. 2 is a block diagram of the waveform processing section 8. As shown in FIG.

In the figure, 14 is an A/D converter which converts the electrocardiographic signal taken out from the subject 3 by the electrocardiograph 7 into a digital signal and sends it to the ECG display memory 15 and the ECG recording memory 16. ECG display memory 15 is on monitor 1
This is a recursive memory that holds the latest waveform data for several seconds to be displayed on the 0 screen. The ECG recording memory 16 holds A/D converted electrocardiographic waveform data from the start of imaging to the end of the X-ray device.The 6 selector 17 selects either the ECG display memory 15 or the ECG recording memory 16. is selected by a command from the CPU 13, and its output is sent to the display control section 9 and the VTR interface section 11.
It is used to transfer data to and from.

Next, the operation of the ECG display memory 15 will be explained with reference to FIG. The configuration of the ECG display memory 15 is as follows.

RAM (Random Access Memory
), a pointer pointing to an address on RAM, etc. A
The latest waveform data output from the /D converter 14 is E
It is written to the address designated by the pointer 18 in FIG. 3, which shows the concept of operation within the CG display memory 15.

When writing is completed, the pointer 18 moves to the next address 1.
8' and repeats the operation of waiting for the next data to be written. When the pointer 18 reaches the final address of the RAM, or when starting from the final address, when the writing to that address is completed, the pointer 18 moves to the beginning. Return to Data writing is typically performed several times during an ITV frame, depending on the sampling rate of the A/D converter. On the other hand, the memory contents are stored in I
All contents are read out once or twice per TV frame. When reading, the address of the pointer 18 remains fixed, and the address is changed sequentially from the address indicated by the pointer 18, and when it reaches the final address, it returns to the first address and ends at the address one before the address indicated by the pointer 18. By reading out all the memory contents in the same order as zero or more, the ECG display memory 15 always holds the latest waveform data for several seconds.

Next, the operation of each part when recording X-ray images and electrocardiographic waveforms on the VTR 12 and reproducing them will be explained.

First, a case will be described in which the subject 3 is continuously irradiated with X-rays and the image thereof is recorded and played back as a moving image. In FIG. 1, an X-ray image converted into a visible image by an X-ray image intensifier 4 is converted into a video signal by a television camera 5.

This video signal is digitally and continuously image-processed by the image data calculation unit 6, converted back into an analog signal by the display control unit 9, and displayed on the monitor 10. On the other hand, the electrocardiographic signal obtained from the subject 3 by the electrocardiograph 7 in synchronization with the X-ray imaging is processed by the waveform processing section 8.
The data is converted into digital electrocardiographic data by the A/D converter 14 in the internal ECG display memory 15 and written into the ECG display memory 15. in this case,
The selector 17 selects the ECG display memory 15 according to a command from the CPU 13, and selects IT from the ECG display memory 15.
The electrocardiographic data of all addresses are read out at a rate of 1 to 2 times per v frame, and the electrocardiographic waveform is displayed on the monitor 10 via the display control section 9 together with the X-ray image. As shown in Figure 9, this display screen shows that the electrocardiogram waveform is located at the periphery of the monitor display area and is outside the X-ray image display range, or if part of the electrocardiogram waveform falls within the X-ray image display range. It will be displayed to such an extent. Further, both one image data and waveform data are input to the VTR interface unit 11. The VTR interface section 11 performs D/A conversion on these two data and outputs them to the VTR 12 so that the video signal of the image is recorded on the image track and the electrocardiogram waveform data is recorded on eight separate audio tracks. records two pieces of data exactly as shown. FIG. 7 is a conceptual diagram of the state in which these two data are recorded on a videotape. Next, the operation during playback will be explained. VTR12
When operated in playback mode, image data and waveform data are input to the VTR interface section 11. VTR
The interface section 11 converts these analog signals into A/
After D conversion and jitter correction.

Each digital signal is output to the opposite side from when it was input, that is, to the display control section 9.

The display control section 9 outputs a signal to display one image data and waveform data on the monitor 10 in the same manner as described above. As a result, the images and waveforms recorded on the VTR are reproduced and displayed.

Next, the subject 3 is irradiated with X-rays in a pulsed manner several times per second or once every few seconds in synchronization with the vertical synchronization signal of the TV,
The case where one image is obtained for each X-ray emission, that is, the case where a still image is obtained will be explained.

The image data obtained by the first irradiation of pulsed X#1 is processed by the image data calculation section 6 and displayed on the monitor 10 via the display control section 9, as in the case of the continuous irradiation described above. . However, in this case, the first image is displayed as the latest image on the monitor 10 until an image display signal from the next pulsed X-ray irradiation is input. The electrocardiographic waveform being photographed is recorded and held in the ECG recording memory 16. Note that the 1-image data calculation section 6 has an image memory, which stores and holds each image data and can read it out at will. When recording the image data obtained in this way onto the VTR 12, in order to make effective use of the videotape, the VTR is operated regardless of the actual shooting timing, and the image data corresponding to one or several frames of the TV signal is recorded. It is preferable to read the data from the image memory and record it on the VTR 12. In the case of this imaging method, the selector 17 in the waveform processing section 8 selects the ECG recording memory 16, and the pulse
The waveform data is outputted to the display control section 9 in synchronization with the output of image data due to the irradiation of @, and displayed on the monitor 10.

Next, the recording operation to the VTR 12 will be explained. After the completion of X-ray imaging, the six image data to be recorded on the VTR are read out from the image memory in the image data calculation section 6 according to an operator's command, and are sent to the VTR interface section 11 in the order of imaging, one ITV frame at a time. It is recorded on VTR128.

The waveform data is read out sequentially from the address on the ECG recording memory 16 for several heartbeats in time with each image data read out from the image memory (see Figure 6).
, are recorded on the VTR 12 via the VTR interface section 11. When reproducing these recorded data from the VTR 12, the recorded data is once written from the VTR interface section 11 to the image memory and the ECG recording memory 16, and then displayed on the monitor 10 via the display control section 11. According to this method, image data and waveform data can be separated, and if a switching circuit 20 is provided between the display control section 9 and the VTR interface section 11, only one of the data can be sent to the CRT device 10. It is also possible to display.

As explained above, according to this embodiment, still image recording and
Even during playback, waveform data can be time-compressed and recorded, and biological phenomenon waveforms can be recorded in correspondence with each image.

In the above embodiment, the waveform data is recorded on the audio track of the videotape, but the present invention is not limited to this.For example, if there is an empty image track, recording may be performed there. You may do so. In this case, it is possible to play back the waveform during still playback, reverse playback, and search of the VTR, and it is possible to freeze the waveform during still playback and to play back the waveform during reverse playback without switching the image processing device. Reverse scrolling of waveforms and fast forwarding of waveforms during searches are also possible.

Further, in the above description, the VTR has been explained as an analog type VTR, but it is easily possible to apply the same to a digital type VTR.

〔Effect of the invention〕

As explained above, according to the present invention, in an apparatus capable of recording and reproducing medical images obtained by a medical image diagnostic apparatus and biological information waveforms obtained by a biological phenomenon measuring apparatus, a moving image mode and a still image mode are provided. Since waveform data in the same format can be recorded in both
Even if the TR image is used as a still image file, the waveform can be clearly observed. Furthermore, it becomes possible to display the image and the waveform separately.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a medical image recording device according to an embodiment of the present invention, FIG. 2 is a block diagram of the waveform processing section in FIG. 1, and FIG. 3 is an ECG diagram in FIG. A conceptual diagram of the operation of the display memory. Figure 4 is a diagram of the timing relationship between photography and recording in the VTR normal recording mode. Figure 5 is a diagram of the timing relationship between photography and recording in the VTR time compression recording mode. Figure 6 is a diagram of the timing relationship between photography and recording in the VTR time compression recording mode.
The figure is an explanatory diagram of the transfer of electrocardiographic waveforms during VTR time compression recording, Figure 7 is a correspondence diagram of the recording relationship between images and waveforms of the present invention, and Figure 8 is a diagram of the recording relationship correspondence between conventional images and waveforms. FIG. 9 is a diagram showing an example of images and waveforms displayed on a monitor. 3... Subject, 6... Image data calculation unit, 7...
Electrocardiograph, 8...Waveform processing section, 9...Display control section, 10...Monitor, 11...VTR interface section, 12.VTR113.CPU, 15.E C
G display mail, 16...ECG recording memory, 20
...Switching circuit.

Claims (1)

[Scope of Claims] 1. A medical image diagnostic apparatus that injects an energy medium into a subject and extracts information provided by the energy medium as an image, and extracts energy information emitted by the subject itself as a continuous signal. A display device that simultaneously displays information obtained by the medical image diagnostic device and information obtained by the biological phenomenon measurement device on the same video display medium. and a recording device for recording and reproducing images displayed on the display device, wherein the recording device includes a biological phenomenon measuring device for each recorded image obtained by the medical image diagnostic device. 1. A medical image recording apparatus comprising a waveform recording means for time-compressing a continuous signal obtained in the above and recording it as a corresponding signal. 2. The recording device is a VTR (Video Tape Recorder).
der) The medical image recording apparatus according to claim 1, wherein the medical image recording apparatus is a medical image recording apparatus. 3. The medical image recording apparatus according to claim 2, wherein the biological information signal is recorded on an audio track of a videotape or on an empty area of an image track.