Method and system for improving DOI-PET sensitivity

Abstract

The invention discloses a method and system for improving DOI-PET sensitivity. The method comprises the steps of arranging an inner PET detector and an outer PET detector around an imaging object; using the inner PET detector and the outer PET detector to perform data acquisition on photons generated by a gamma event emitted by the imaging object; arranging a first energy window on the inner PET detector, and arranging an extended energy window on the outer PET detector; storing data collected by the inner PET detector falling into the first energy window, and storing the data collected by theouter PET detector falling into the extended energy window for data reconstruction. The system has the following advantages that the PET sensitivity can be effectively improved without increasing additional costs, thereby improving the PET imaging effect.

Description

technical field [0001] The invention relates to the field of imaging technology, in particular to a method and system for improving the sensitivity of DOI-PET (depth of interaction-positron emission tomography). Background technique [0002] Positron Emission Tomography (PET) is one of the main imaging techniques. At present, the PET system detector is mainly composed of cerium-doped lutetium silicate (LSO), cerium-doped yttrium lutetium silicate (LYSO) and photomultiplier tubes or silicon photomultiplier tubes. The coincidence detection technology is used to detect the positrons and electrons produced by radionuclides. A pair of gamma photons with opposite motion directions and energy of 511keV emitted by the annihilation of tissue negative electrons are then obtained through a specific reconstruction algorithm to obtain the three-dimensional distribution of radiopharmaceuticals in the imaging object. [0003] Because the gamma photons have a probability of scattering with...

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Problems solved by technology

However, in addition to the Compton scattering of gamma photons on the human body, some gamma photons are also scattered on the detector, and only part of the energy is deposited. This part of the event could have been used to correctly locate the corresponding response line, but it was blocked by the energy window. dropped, which somewhat reduces the sensitivity of the PET system

[0004] DOI-PET is one of the development directions of PET detectors. The depth information of gamma events can be obtained through spectroscopic methods, pulse discrimination methods, double-ended readout methods and continuous crystal multi-channel readout methods, which can reduce the parallax effect, thereby Improve the spatial resolution of the system, but the sensitivity of DOI-PET in related technologies still needs to be improved

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