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The hexagonal prism shaped crystal shows potential to design a PET system for its higher ray blocking efficiency and equidistance with neighbors. This paper proposed a honeycomb PET based on hexagonal prism shaped scintillation crystals. Its performance was evaluated and compared with a traditional PET system based on rectangular prism shaped crystals by GEANT4 simulation. The results show that the...
In our previous work, we have proposed a stationary panel positron emission tomography (PET) for human body imaging. Besides the large solid angle, the panel PET also provides an open geometry which allows other operations being performed simultaneously during a PET scanning. However, the main challenge of panel PET is the limited view problem. Images reconstructed using traditional algorithms will...
The ellipse detection is one of the classic problems in digital image processing, and has broad application prospects in machine vision, especially in automatic detection and assembly. In this paper, a novel algorithm for ellipse detection based on geometry features is presented. With the help of projection methods, the center of ellipse is detected and used to reduce the dimension of ellipse parameter...
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