JPH0627832B2 - Dynamic inspection automatic start system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention is used in the field of collecting RI images.

The present invention relates to a dynamic inspection automatic start system, and more particularly to acquisition of RI images by a scintillation camera and a data processing device, and more particularly to improvement of acquisition start in dynamic inspection by a scintillation camera.

(B) Prior art In a dynamic examination, an RI image that changes with time is
The inspection is performed by repeatedly and repeatedly capturing images at a speed of 20 sheets / sec.

When collecting such dynamic data with a scintillation camera, one person pushes a start switch for collection and another person intravenously injects RI to share the collection work.

(C) Problems to be Solved by the Invention In such a sharing work, timing becomes a problem.

If the start of collection is too early for the intravenous injection of RI, a large amount of useless data will be collected, and if it is too late, the data immediately after the intravenous injection of RI may not be collected. Also, 1
It is difficult to process and compare because the start time of data collection differs every time.

An object of the present invention is to dynamically collect only the data immediately after the intravenous injection of RI, without collecting the data before the intravenous injection of RI, regardless of the time when the intravenous injection of RI is performed after the start of the collection. It is to provide an automatic inspection start system.

(D) Means for Solving the Problems The above-mentioned object is composed of a scintillation camera and a data processing device, and the position information of each incident γ-ray from the camera and the time information from the built-in timer are sent to the data processing device, In the data collection in which two-dimensional coordinates are defined in the frame data area of the image memory, 1 is added to the content of the address corresponding to the incident position, and the RI image is generated after a certain time, the frame corresponding to the field of view of the camera. A memory in which a data area for setting a region of interest in the data region and identifying the set region is written, and counting means for counting only γ rays incident on the region of interest based on the memory,
The count value and the set value are compared at regular intervals, and if the count value exceeds the set value, the relevant frame data area of the image memory is shifted to the next frame data area, while the count value is below the set value. In some cases, this can be achieved by including a data collection unit that initializes the frame data area and reuses it.

(E) In addition to the frame data area of the working image memory, it has a memory in which an area of interest with unique data contents is set within the same frame data area corresponding to the irradiation field of the scintillation camera, and within that area of interest. The number of γ-rays entered is counted, and if the count value exceeds a certain value, the frame data area of the image memory is changed to the next frame data area, and if it is within a certain value, the same frame data area is initialized. Then, the data collection before the intravenous injection of RI is blocked, and only valid images are collected.

(F) Embodiment A preferred embodiment of the present invention will be described with reference to the drawings.

The first pass method of the heart will be described as an example.

As shown in FIG. 3, the detector 10 is positioned, and on the data processing device 20 side, the sampling interval, the number of frames, and
The region of interest (ROI) illustrated in FIG. 4 is set.

In addition, 12 is a patient and 14 is an RI intravenous injection set. In addition, a memory 22 in which a region of interest 16 having unique data contents is set in the same frame data region corresponding to the irradiation field 18 of the scintillation camera 10 is prepared.

When RI is not intravenously injected, there is almost no count as in the frame of FIG. Data processing device 2
For 0, the total count number in the ROI 16 is checked at every sampling interval, and if it is less than a predetermined value, all the frames are cleared, that is, the data area corresponding to all pixels is set to 0, and data is again stored in the frame.

In this state, since an effective image is not formed, data collection is not performed and a wait state is set.

Here, when the RI is rapidly injected from the vein, as shown in the frame of FIG. 2, the peripheral portion or the region of interest (ROI) 1
The count number in 6 becomes large.

Since the number of counts in the ROI 16 has become larger than the predetermined value set in advance, the data processing device 20 switches to frames, ... At the set sampling interval and starts collecting data.

FIG. 1 is an exemplary configuration diagram for realizing such an operation example.

Reference numeral 22 is an ROI memory in which the unique data is written only in the region of interest (ROI) 16 described above, and the position information X,
When Y is input and an output appears in the data area of the region of interest 16, the counting circuit 24 counts up by inputting the γ-ray incident signal.

That is, in the ROI memory 22, the counting circuit 24 counts up by the number of incident γ rays in the ROI.

After a certain period of time, the output value or the count value of the counting path 24 is compared with a preset value set by the data processing device 20 by the comparison circuit 26. If the count value is smaller, the frame setting means 28 gives an image. The number of frame shifts in the memory is +0, and if it is large, it is incremented by 1.

(G) Effectiveness Data collection will not start too early or too late. Especially in the case of the first pass, there is no failure in data collection.

Since data collection starts at the same timing, it is expected that data comparison and processing will be easier.

[Brief description of drawings]

FIG. 1 is a block diagram of the essential parts showing one embodiment of the present invention, FIG. 2 is an illustration of a RI image that changes with time according to the present invention, and FIG. 3 is an overall configuration diagram of the present invention. The figure is an exemplary view of setting a region of interest (ROI) according to the present invention. 10 is a scintillation camera or detector, 16 is a region of interest or ROI, 20 is a data processor, 22 is R
An OI memory, 24 is a counting circuit, 26 is a comparison circuit, and 28 is a frame setting unit.

Claims (1)

[Claims] 1. A scintillation camera and a data processing device, from which position information of each incident γ-ray and time information from a built-in timer are sent to the data processing device,
In the data collection in which two-dimensional coordinates are defined in the frame data area of the image memory, 1 is added to the content of the address corresponding to the incident position, and the RI image is generated after a certain time, the frame corresponding to the field of view of the camera. A memory in which a region of interest is set in the data region and data contents for identifying the set region is written, a counting means for counting only γ rays incident on the region of interest based on the memory, and Compares the count value with the set value, and shifts the frame data area of the image memory to the next frame data area when the count value exceeds the set value, and the frame when the count value is less than or equal to the set value. A dynamic test automatic start system, comprising: a data collection unit that initializes a data area and reuses the data area.