Image reconstruction method for dual panel position-emission tomography (PET) detector

Abstract

The invention relates to an image reconstruction method for a dual panel position-emission tomography (PET) detector. The image reconstruction method for the dual panel PET detector comprises the following steps: conducting simulation on image process of a dual panel PET detection structure by using simulation software; recording line of response (LOR) information corresponding to all coincidence events and voxels where annihilation events lay; judging the type of one coincidence event according to positions of photon pairs in the annihilation events, considering the coincidence event as a true coincidence event if the occurring positions of the pair of photons corresponding to the coincidence event are consistent, considering the coincidence event as a random coincidence event if the occurring positions are inconsistent and removing the random coincidence event; expanding the range of the voxels; obtaining a compressed system response matrix through calculation by using symmetry of the structure the dual panel PET detector; reconstructing an image by using the obtained system response matrix. The image reconstruction method for the dual panel PET detector can be widely in the image reconstruction of the PET detector with the dual panel PET detection structure.

Description

technical field [0001] The invention relates to an image reconstruction method, in particular to an image reconstruction method for a double flat-panel PET detector. Background technique [0002] Positron Emission Tomography (PET) is a non-invasive in vivo functional imaging technique widely used in clinical examination and biological research. Most traditional PET detectors use ring-shaped detection structures to obtain complete sampling angles. In order to reduce costs and system complexity, in some specific application fields, some researchers have also proposed dual-plate PET detection structures to improve sensitivity and spatial resolution. At the same time, it can also greatly reduce costs. Positron Emission Mammography (PEM) technology using double-plate PET detection structure is a typical application, which can be used to perform tomographic imaging of the distribution of radioactive substances in the breast. In addition, the dual-panel PET detection structure ca...

AI Technical Summary

Problems solved by technology

System Response Matrix (System Response Matrix, SRM) is a mathematical description of the imaging process of the system, and its importance is self-evident. Several methods are combined to obtain, among them, the analytical method is difficult to describe the physical factors including DOI, while the experimental method needs an actual system, and has high requirements for the experimental conditions, and the operation is relatively complicated

In contrast, the Monte Carlo method is more flexible in application, but the inherent statistical characteristics of the Monte Carlo method make the obtained system response matrix affected by noise; in addition, the scale of the system response matrix is ​​often very large, and it is difficult to convert the entire system response matrix The above factors all affect the application of the Monte Carlo method in actual image reconstruction

ChienMin Kao et al. used the symmetry of the flat-panel detection structure to compress the system response matrix and achieved good results. However, the flat-panel PET detector needs to be expanded in advance during simulation, which makes the simulation process complicated and also difficult. Affected the improvement of the compression ratio

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