JPH03139335A - X-ray image display equipment - Google Patents

Abstract

PURPOSE:To prevent a recognition mistake of flashing image by indicating whether the flashing image is recognized automatically or not on a indicator, etc., and by informing it to an operator before a superimposition of a fluoroscopic image and the flashing image are carried out. CONSTITUTION:A selection circuit 2 finds out a pixel value of every one frame of a subject with a one frame accumulation circuit 3 based on fluoroscopic image data from an ADC 1, puts out a comparison output from a comparator 5 to an AND 6, when the obtained pixel value exceeds a comparison value of a comparison value register 4, and puts out a flashing recognition signal. If a flashing recognition signal is put into an image memory 7, fluoroscopic images are selected and a flashing image for contrast media infusion frame is written into the memory 7. If a detection circuit 10 detects that there is no position shift in the flashing image, it puts out position shift signals into a superimpose 18 and an AND 12. An indicator 14 is lighted by this position shift signal together with the flashing recognition signal. If an operator inputs a command through a voice recognition circuit 16 after recognizing the indicator light, the flashing image is superimposed on the fluoroscopic images which are input in order.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to an X-ray image display device that displays digitally converted continuous images.

(Industrial Application Field) Conventionally, for example, in X-ray image display devices,
Pension radiology is used. This inter-pension radiology involves percutaneously inserting a catheter into the body and injecting a medicinal solution into the affected area.

When Inter-Pension Radiology is applied to an X-ray image display device, it is performed as follows.

The X-rays emitted from the X-ray tube pass through the object, and the
The lines are detected by an image intensifier and converted into an optical image. This optical image is converted into a TV video signal by the TV right camera via a lens system, and when this TV video signal is input to the TV monitor, a perspective image is displayed on the TV monitor.

Next, under this X-ray fluoroscopy state, the operator inserts a catheter and a guide wire into, for example, a blood vessel of the subject.

At this time, the operator confirms the position of the catheter from the fluoroscopic image displayed on the TV monitor, and inserts the catheter further into the blood vessel while operating the guide wire. However, since blood vessels cannot be seen in X-ray fluoroscopic images, angiography is performed by injecting a contrast medium into the blood vessels via a catheter. However, even if the angiography is performed,
Since the blood vessel shape that appears in a fluoroscopic image disappears quickly, a contrast-enhanced image (hereinafter referred to as a flushing image) at the moment the contrast agent is injected into the subject is immediately written into memory.

For writing the flashing image into the memory, for example, the technique described in Japanese Unexamined Patent Publication No. 64-58243 can be applied. In other words, this content means that when a small amount of contrast agent is injected into a blood vessel via a catheter, the pixel cumulative value of one frame of the subject's X-ray fluoroscopic image increases, so the pixel value of each frame of the subject's X-ray fluoroscopic image increases. By comparing the cumulative values, it is possible to select the contrast agent injection frame having the maximum pixel cumulative value. Then, the flashing image obtained is
By superimposing it on the fluoroscopic image, a road map image of the catheter inserted can be obtained.

(Problem to be Solved by the Invention) However, for example, when selecting a contrast medium injection frame (hereinafter referred to as automatic recognition of a flushing image) by a selection means (for example, an internal processor), a patient's body movement may be mistaken for a flushing image. Sometimes it was detected.

Additionally, movement of the catheter was recognized as flushing, resulting in malfunction. Furthermore, if catheter movement is mistakenly detected as flushing, the resulting image will be very unpleasant for the operator when superimposing the flushing image and the fluoroscopic image.

Therefore, an object of the present invention is to provide an X-ray image display device that can reliably automatically recognize flashing images without erroneously detecting movements of the subject, and that can reduce the operator's workload. It is about providing.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems and achieve the objects, the present invention takes the following measures. That is, the first aspect of the present invention is to store a flashing image of a contrast agent injection frame selected by a selection means based on a change in pixel cumulative value for each frame of consecutively input fluoroscopic images in a storage means, and to store the flushing image from the storage means. In an X-ray image display device that superimposes a flushing image on a fluoroscopic image, prior to superimposing the flashing image and the fluoroscopic image, a notification means for notifying that the selection means has selected and recognized a flashing image; The apparatus is characterized by comprising an instruction means for instructing the overlapping based on broadcast information from the means.

A second invention includes a detection means for detecting a positional deviation between a flushing image and a fluoroscopic image, and when the positional deviation from the detection means exceeds a predetermined comparison value, the flashing image and the fluoroscopic image are superimposed. and a means for outputting a signal for stopping the operation.

(Effects) By taking such measures, the following effects will occur. Before the fluoroscopic image and the flushing image are superimposed, the operator is informed whether the flushing image has been automatically recognized by displaying, for example, an indicator on an indicator. After confirming this, the surgeon can change the flushing image to the fluoroscopic image by issuing a command. can be superimposed on This prevents incomplete recognition of the flushing image, and even if a small amount of contrast medium is added, when there is no need to superimpose it on the fluoroscopic image, it does not interfere with the operator's operation and reduces the operator's workload. It can be reduced.

In addition, the flushing image is always compared with the fluoroscopic image to determine the presence or absence of positional deviation, and when the positional deviation exceeds the comparison value, superimposition is stopped, so even if there is movement of the subject, recognition errors in the flashing image can be avoided. It can be prevented.

(Implementation flq) Specific examples will be described below. FIG. 1 is a schematic configuration diagram showing an embodiment of an X-ray image display device according to the present invention;
FIG. 2 is a flow diagram for explaining the operation of the X-ray image display device. In FIG. 1, the X-ray image display device is an analog/digital converter (hereinafter referred to as ADC).
11 selection means 21 image memory 7, positional deviation detection circuit 10
．． Comparator 11. ANDGATE 12. Indicator 14° Voice recognition circuit 16. It has a superimpose circuit 18 and a TV monitor 20.

The ADCI converts an analog TV video signal input from a TV right camera (not shown) into a digital TV video signal.

The selection means 2 selects a contrast agent-containing frame based on the change in pixel cumulative value for each frame of the X-ray fluoroscopic image of the subject, and is configured as follows. The one-frame accumulation circuit 3 obtains pixel values for each frame of the X-ray fluoroscopic image of the subject based on the fluoroscopic image data input from the ADCI.

The comparison value register 4 stores a predetermined comparison value based on the pixel cumulative value of one frame of the X-ray fluoroscopic image of the subject before contrast agent injection. The comparator 5 compares the comparison value of the comparison value register 4 with the output value of the one-frame accumulation circuit 3, and the AND gate 6 is activated by a signal input from the outside.

The image memory 7 as a storage means stores the flashing image of the contrast medium injection frame selected by the selection means 2, and is written when the output of the AND gate 6 is at a high level, and is used to store the fluoroscopic image data input from the ADCI. is to be written.

A positional deviation detection circuit 10 serving as a detection means detects a positional deviation between the flashing image inputted from the image memory 7 and the perspective image inputted from the ADCI.

When the positional deviation from the position detection circuit 10 exceeds a predetermined comparison value, the comparator 11 outputs a positional deviation signal "0" for stopping the superimposition of the flashing image and the fluoroscopic image, and When the positional deviation does not exceed the comparison value, a positional deviation signal "1" is output. AND gate 12 ANDs the positional deviation signal from comparator 11 and the flushing recognition signal from AND gate 6;
An indicator 14 serving as a notification means is lit by the output from the AND gate 12.

A voice recognition circuit 16 serving as an instruction means recognizes the voice generated by the operator when the operator confirms that the indicator 14 is lit and knows that the automatic recognition of the flashing image has been completely performed.

The superimposing circuit 18 superimposes the fluoroscopic image and the flashing image based on the audio information from the audio recognition circuit 16, and also superimposes the fluoroscopic image and the flashing image when the positional deviation signal from the comparator 11 is "1" (that is, the fluoroscopic image If the positional deviation between the flashing image and the flashing image exceeds the comparison value, the superimposition is stopped.

Next, the operation of the embodiment configured as described above will be explained with reference to FIGS. 1 and 2. First, under fluoroscopic conditions, the operator operates the catheter and guide wire (Step A).
. Next, a small amount of contrast medium is inserted and flushing is performed (
Step B). Then, the selection means 2 determines whether the flancing image has been recognized based on the pixel cumulative value information (step C).

That is, the fluoroscopic image data is converted into a digital signal by the ADCI, and a contrast agent-containing frame is selected by the selection means 2 shown in FIG. Ru. In other words, the above A
Based on the fluoroscopic image data input from the DCI, the 1-frame accumulation circuit 3 calculates the pixel value for each frame of the fluoroscopic image of the subject, and the comparator 5 compares the comparison value of the comparison value register 4 with the output value of the 1-frame accumulation circuit 3. are compared.

Here, if the output value of the one-frame accumulation circuit 3 exceeds the comparison value of the comparison value register 4, a comparison output is outputted from the comparator 5 to the AND gate 6.

A flushing recognition signal is obtained from the AND gate 6 by inputting the comparison output and an operation signal input from the outside, and automatic recognition of flushing is performed. When this flashing recognition signal is input to the image memory 7,
The fluoroscopic image from the ADCI at that moment is selected, that is, the flashing image in the contrast agent injection frame is written into the image memory 7 (step D).

On the other hand, the flushing image data written in the image memory 7 is immediately read out, and this flushing image data is constantly compared with continuously inputted fluoroscopic images by the positional deviation detection circuit 10 to detect positional deviations (step J
). Note that when the target is the heart, the effects of the essential movement of the heart can be removed by comparing them using certain specific electrocardiographic phases.

If the positional deviation detection circuit 10 determines that there is no positional deviation, a positional deviation signal instructing "no positional deviation" is output to the AND gate 12 and the superimpose 18 at active level "1". . If there is a "positional shift", a signal instructing "positional shift" is output to the AND gate 12 and the superimpose 18 at a non-active level of "0".

Therefore, when the active level "1" of the signal commanding "no position shift" and the flushing recognition signal "1" indicating that flushing has been recognized are both input to the AND gate 12, the indicator 14 lights up (
Step E).

Then, the operator checks the indicator 14 and determines that the selection means 2 (for example, the processor) has correctly recognized the flashing image when the operator has performed the flushing based on his/her own judgment and the indicator 14 lights up. It turns out that. Then, when the operator says "ON" by voice, for example, the command is sent to the superimpose circuit 18 by the voice recognition circuit 16. When the operator's command is input to the superimpose circuit 18, the flushing image (memory output) and the sequentially input fluoroscopic images are superimposed (step G).

Meanwhile, the state of positional deviation between the flushing image and the fluoroscopic image is constantly monitored (step J), and if the positional deviation exceeds the comparison value, the comparator 11 outputs a signal active level indicating that there is a positional deviation. When "0" is input to the AND gate 12, the indicator 14 is turned off (step K).

In this case, since the operator does not instruct the superimposition by voice because the subject has moved, the superposition by the superimpose 12 is stopped.

Further, in this case, the system is on standby for the next flushing recognition (step H), and the AND gate 6 is in a state of outputting the output from the comparator 5 to the image memory 7.

As described above, according to the present embodiment, before superimposing the fluoroscopic image and the flushing image, the indicator 14 displays whether or not the flushing image has been automatically recognized to notify the operator. The superimpose circuit 18 is activated by issuing a command to the voice recognition circuit 16.
The flashing image can be superimposed on the fluoroscopic image.

This prevents incomplete recognition of the flushing image, and even if a small amount of contrast medium is added, when there is no need to superimpose it on the fluoroscopic image, it does not interfere with the operator's operation and reduces the operator's workload. It can be reduced.

In addition, the flushing image is always compared with the fluoroscopic image to determine the presence or absence of positional deviation, and when the positional deviation exceeds the comparison value, superimposition is stopped, so even if there is movement of the subject, recognition errors in the flashing image may occur. can be prevented.

Note that the present invention is not limited to the embodiments described above. In the above-described embodiment, the voice recognition circuit 16 has been described as a method for inputting commands by the surgeon, but there are various methods for inputting commands by the surgeon other than voice recognition, such as key-in. In addition, the display method on the indicator 14 is also determined by the TV monitor 20.
There are methods such as outputting marks on the edges of the . It goes without saying that various other modifications can be made without departing from the gist of the present invention.

[Effects of the Invention] According to the present invention, prior to superimposing the fluoroscopic image and the flushing image, whether or not the flushing image has been automatically recognized is displayed on an indicator, for example, to inform the surgeon. The flashing image can be superimposed on the transparent image by issuing a command. This prevents incomplete recognition of the flushing image, and even if a small amount of contrast medium is injected, when there is no need to superimpose it on the fluoroscopic image, it does not impede the operator's operation and burdens the operator's work. can be reduced.

In addition, the flushing image is always compared with the fluoroscopic image to determine the presence or absence of positional deviation, and when the positional deviation exceeds the comparison value, the overlapping process is stopped, so even if there is movement of the subject, the flashing image An X-ray image display device that can prevent recognition errors can be provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of an X-ray image display device according to the present invention, and FIG. 2 is a flow diagram for explaining the operation of the X-ray image display device. DESCRIPTION OF SYMBOLS 1...ADC12...Selection means, 3...1 frame accumulation circuit, 4.Comparison value register, 5...Comparator, 6.
- AND gate, 7... Image memory, 10... Positional deviation detection circuit, 1]... Comparator, 12... AND gate, ] 4... Indicator, 16... Voice recognition circuit, 18... superimpose circuit,

Claims (2)

[Claims] (1) The flashing image of the contrast agent injection frame selected by the selection means based on the change in pixel cumulative value for each frame of continuously input fluoroscopic images is stored in the storage means, and the flushing image from the storage means is superimposed on the fluoroscopic image. In the combined X-ray image display device, prior to superimposing the flashing image and the fluoroscopic image, a notification means for notifying that the selection means has selected and recognized the flashing image, and based on notification information from the notification means. An X-ray image display device comprising: instruction means for instructing the superposition. (2) A detection means for detecting a positional deviation between the flushing image and the fluoroscopic image, and stopping the superimposition of the flashing image and the fluoroscopic image when the positional deviation from the detection means exceeds a predetermined comparison value. X according to claim 1, further comprising means for outputting a signal for
Line image display device.