Gamma camera and method for detecting radiation ray by utilizing same

Abstract

The invention discloses a gamma camera which comprises a first gamma imaging unit and a second gamma imaging unit, wherein the first gamma imaging unit comprises a first coding plate provided with a first pattern formed by a plurality of coding elements and a first detector for detecting a radiation ray penetrating through the first coding plate; the second gamma imaging unit comprises a second coding plate provided with a second pattern formed by a plurality of coding elements and a second detector for detecting the radiation ray penetrating through the second coding plate; and the first pattern and the second pattern form opposite patterns. The invention is characterized in that the longitudinal axes of the first and the second gamma imaging units are in parallel and not coincided, and the same imaging regions are defined; the first and the second gamma imaging units are arranged at the same sides of the same imaging regions; and a shielding piece is arranged between the first gamma imaging unit and the second gamma imaging unit for preventing the radiation ray incident in the first gamma imaging unit and the second gamma imaging unit from mutual interference.

Description

technical field [0001] The invention belongs to the field of radiation detection, and relates to a gamma camera used for radioactive source location and nuclide identification. More specifically, the present invention relates to a portable real-time imaging gamma camera. In addition, the present invention also relates to a method for detecting radiation rays by using the gamma camera. Background technique [0002] The portable gamma camera with the functions of radioactive source location and nuclide identification is a kind of radioactive material monitoring equipment that has only been released in recent years. Compared with other radionuclide identification devices (RID), it can locate radioactive sources at a long distance. Further, the video image of the monitored object is acquired by the optical camera device, combined with the use of the video image, the specific physical position of the radiation source can be determined. [0003] figure 1 It is a schematic diag...

AI Technical Summary

Problems solved by technology

[0006] However, there is a problem that cannot be ignored in the existing gamma cameras: in order to obtain a coded and reconstructed image with better quality, the image reconstruction algorithm not only needs to have good statistics of the projection data, but also needs to collect two sets of projection data in positive and negative modes , so that a clear image can be reconstructed

Specifically, after the first data collection, the coding board needs to be rotated 90 degrees to obtain the coding board in the opposite mode for the second data collection, which is inefficient and causes the staff to stay in the radiation field for a long time

[0007] In addition, real-time imaging cannot be achieved because two sets of data in the positive and negative modes need to be collected twice for image reconstruction.

Therefore, this will greatly affect the speed of encoding imaging in the inspection mode, so that the goal of quickly locating the radioactive source cannot be achieved

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