Gamma camera based on dual-detector technology

Abstract

A gamma camera based on dual-detector technology comprises an encoder plate, a shielding body, a readout circuit, a data processing circuit, a reconstruction circuit, a position sensitive detector, anenergy sensitive detector and an optical camera. After a gamma ray emitted from a radioactive material to a detection area is encoded by the encoder plate, the position sensitive detector collects and generates the projection data and a first energy spectrum data set, the energy sensitive detector collects and generates a second energy spectrum data set, the data processing circuit receives the first energy spectrum data set and the second energy spectrum data set to obtain combined energy spectrum data, the reconstruction circuit obtains a gamma radiation image according to the projection data and the combined energy spectrum data, the optical camera acquires a visible light image. The visible light image is integrated with a two-dimensional radiation image generated by the gamma cameraso as to achieve accurate registration and fusion of two modal images. Energy spectrum analysis is performed by using the combined energy spectrum data such that a high-resolution energy spectrum is obtained, and nuclide identification is performed based on a built-in nuclides library.

Description

technical field [0001] The invention relates to the field of radioactive substance detection, in particular to a gamma camera based on dual-detector technology. Background technique [0002] The location of radioactive substances, radiation dose measurement, nuclide type identification and activity measurement have a wide range of applications in the fields of nuclear industry, nuclear safety, environmental protection, industrial and medical radioactive source management, and public safety. [0003] The traditional means of detecting radioactive substances mainly include: dosimeter, gamma spectrometer and gamma camera. Among them, the gamma camera is a device that uses radiation detection technology to detect radioactive substances. It detects gamma photons incident from all directions on the target angular plane where the radioactive substances are located, and realizes two-dimensional plane distribution imaging of radioactive substances. In addition, the gamma camera can ...

AI Technical Summary

Problems solved by technology

[0004] However, the traditional gamma camera uses the projection data of radioactive substances detected by position-sensitive detectors to generate radiation images with low accuracy, although there are projection data of radioactive substances detected by position-sensitive detectors and A technical solution for generating two-dimensional radiation images from energy spectrum data, but because the energy spectrum data obtained by position-sensitive detectors is not accurate, the precision of the generated two-dimensional radiation images is still not high

[0005] In the prior art, energy spectrum sensitive detectors are usually used to achieve more accurate energy spectrum analysis functions, but energy spectrum sensitive detectors can only be used for energy spectrum analysis, and cannot realize two-dimensional plane distribution imaging of radioactive substances. Spectrally sensitive detectors usually require a long detection time for spectral analysis

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