Algorithms to reduce the edge effect and improve the flood histogram quality of a PET detector consisting of two pixelated crystal arrays

作者：Longhan Cong, Zhonghua Kuang, Ning Ren, Ziru Sang, Zheng Liu, Ming Niu, Siwei Xie, Qiyu Peng, Yongfeng Yang · 发表于：Medical Physics · 年份：2024 · DOI：10.1002/mp.17484 · 被引用次数：3 · 研究领域：Radiation Detection and Scintillator Technologies、Medical Imaging Techniques and Applications、Advanced Semiconductor Detectors and Materials

PURPOSE: The performance of detectors is key for a PET scanner to achieve high spatial resolution and high sensitivity. This work aims to develop flood histogram generating algorithms to reduce the edge effect and improve the crystal identification of a PET detector consisting of two optically coupled pixelated scintillator detectors. METHODS: . The SiPM array is read out with a resistor network circuit to obtain four position encoding energy signals. A novel center of gravity (COG) positioning algorithm using six signals from the two detectors was proposed and compared to the traditional COG algorithms using either four or eight signals from the detectors. The raised-to-the-power (RTP) method was applied to the three COG algorithms for the PET detector. Different powers of the RTP from 1.0 to 2.5 were evaluated. RESULTS: The proposed COG algorithm significantly improves the crystal identification at the junction of the two detectors as compared to the COG algorithm using four signals of each detector, and improves the crystal identification at the center of the two detectors as compared to the COG algorithm using eight signals from both detectors. The RTP method significantly improves the overall flood histogram qualities of the two COG algorithms using either eight or six signals from the two detectors, and the two COG algorithm provide similar flood histogram quality when a power of 1.5 is used. CONCLUSION: The novel positioning algorithms reduce the edge effect and improv...