Method for optimizing layout of discrete crystals in polyhedral detector

Abstract

The invention belongs to the field of crystal detectors, and discloses a method for optimizing the layout of discrete crystals in a polyhedral detector. The method comprises the following steps: (a) for a polyhedral detector, determining the shape of a minimum structure unit and the radius value range of a circumcircle; (b) drawing a plurality of grid charts, placing the minimum structure unit ineach grid chart, and calculating the maximum number of filling units included in the minimum structure unit in each grid chart so as to calculate the filling rate of the minimum structure unit; and (c) taking the grid size of the grid chart corresponding to the maximum filling rate in all the grid charts as the size of the circumcircle of the minimum structure unit so as to obtain the size of theminimum structure unit and the filling rate of the minimum structure unit and realize the optimization of the layout of discrete crystals in the polyhedral detector. According to the invention, the optimal layout of discrete crystals in the polygonal detector is realized, and the effective coverage area of the detector is improved.

Description

technical field [0001] The invention belongs to the field of crystal detectors, and more specifically relates to a method for optimizing the layout of discrete crystals in a polyhedron detector. Background technique [0002] For the traditional annular PET system developed for whole-body scanning, when imaging the brain, most (>80%) of the signal is lost and not detected, resulting in low system sensitivity and low image signal-to-noise ratio, making it difficult to perform high-performance It is difficult to effectively observe the dynamic process of metabolism inside the brain. [0003] The spherical PET system can be used for dynamic monitoring of the metabolism inside the brain. Due to the small radius, large solid space angle, less signal loss, and high crystal space filling rate, it has higher system sensitivity and spatial resolution. However, due to the difficulties in detector design, electronic system design and image reconstruction technology, spherical struct...

AI Technical Summary

Problems solved by technology

System sensitivity is one of the most important parameters of the medical whole-body PET system, which represents the ability of the system to obtain effective signal data and is an important indicator to ensure the spatial resolution of the reconstructed image of the system. The spatial resolution of the system is an important indicator of the quality of the system imaging. At the same time, affected by the spatial resolution of the system and the image reconstruction algorithm, reducing the crystal width can improve the spatial resolution of the image, but excessive reduction of the crystal size will enlarge the response depth effect and increase the parallax, which may lead to a decrease in the spatial resolution of the system.

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