Ultrahigh-sensitivity polyhedral brain PET system

Abstract

The invention discloses an ultrahigh-sensitivity polyhedral brain PET system, and belongs to the technical field of medical imaging. The ultrahigh-sensitivity polyhedral brain PET system comprises a front-end detection module and a rear-end multi-channel readout electronic circuit; the front-end detection module comprises a plurality of detection units, and the plurality of detection units are mutually coupled to jointly form a coaxial multi-layer annular detection space with different diameters; the front-end detection module is used for capturing gamma photons generated by positron annihilation, converting the gamma photons into electric signals and outputting the electric signals to the rear-end multi-channel readout electronic circuit; and the rear-end multi-channel readout electronic circuit is used for receiving and processing the electric signals output by the front-end detection module so as to complete imaging. Compared with the prior art, the sensitivity of the PET system can be remarkably improved, the cost is reduced, a certain annular region can be focused, and the spatial resolution is improved by using crystals with smaller sizes, so that the activity state of cells in small nuclei can be accurately analyzed at relatively low cost in the medical field, and the pathogenesis research of Alzheimer's disease is promoted.

Description

technical field [0001] The invention belongs to the technical field of medical imaging, and more particularly relates to an ultrahigh-sensitivity polyhedral brain PET system. Background technique [0002] Positron Emission Computed Tomography (PET) realizes tomographic imaging by detecting γ-rays produced after the decay of radionuclides. The radionuclides used in PET decay to produce positrons. Positrons are the antiparticles of electrons. When the positrons produced after the decay of radionuclides injected into the living body pass through the tissues of the living body, within a short distance (about 0.5mm, different positron nuclides have different positrons). Electron annihilation distance) annihilates with negative electrons in biological tissues, and all the mass is converted into energy release, producing gamma photon pairs with energy up to 511keV approximately at 180 degrees. By detecting the pair of gamma photons along the emission direction, the line integral ...

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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides an ultra-high sensitivity polyhedral brain PET system, the purpose of which is to solve the problems of the prior art by researching and designing the multi-ring layout of the front-end detection module. Technical Problems with Low Sensitivity of PET Systems

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