PET detector module, PET detector and PET system

Abstract

The invention discloses a PET detector module, a PET detector and a PET system. The PET detector module comprises an array formed by a plurality of crystal. In the array, at least part of adjacent crystal is adhered through high-transparency optical cement, and the refractive index of the optical cement is less than that of the crystal. Since adjacent crystal is adhered through the high-transparency optical cement, the refractive rate of the high-transparency optical cement is less than that of the crystal, compared with a mode of adding a high-reflection material among crystal, use of the high-transparency optical cement has the advantage that light can perform total reflection on the interface formed by the crystal and a high-transparency optical cement layer, and total reflection does not have photon loss, but when a high-reflection layer material is used, the reflective rate of the high-reflection layer material cannot reach 100 percent, and more photons are lost after multiple times of reflection. Furthermore, the selected optical cement has high light transmittance, photon transmittance through the optical cement layer causes less light loss, therefore, the PET detector module can be used for improving light collection, and more photons can be detected.

Description

technical field [0001] The present application relates to the technical field of positron emission tomography, in particular to a PET detector module, a PET detector and a PET system. Background technique [0002] Positron emission tomography (PET) is a nuclear medicine detector used to observe the body's metabolism. The principle is to inject isotope-labeled drugs (imaging agents) with positron emission into the human body. These drugs participate in the physiological processes of the human body. The annihilation effect occurs during the metabolic process, generating two back-to-back gamma rays with an energy of 0.511 MeV. After γ interacts in the scintillator, a large number of photons are released, which are detected by the back-end photodetection element. The more photons are detected, the more conducive to improving the performance of the detector. [0003] In order to accurately locate the incident position of γ in the current PET system, the crystal shape is generall...

AI Technical Summary

Problems solved by technology

The disadvantage of the above solution is that none of the reflective materials currently used can provide 100% reflectivity. When photons are reflected multiple times on the surface, a large number of photons will be absorbed by the reflective layer, resulting in a decrease in light collection.

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