title: Choice of crystal surface finishing for a dual-ended readout depth-of-interaction (DOI) detector.
abstract: The objective of this study was to choose the crystal surface finishing for a dual-ended readout (DER) DOI detector. Through Monte Carlo simulations and experimental studies, we evaluated 4 crystal surface finishing options as combinations of crystal surface polishing (diffuse or specular) and reflector (diffuse or specular) options on a DER detector. We also tested one linear and one logarithm DOI calculation algorithm. The figures of merit used were DOI resolution, DOI positioning error, and energy resolution. Both the simulation and experimental results show that (1) choosing a diffuse type in either surface polishing or reflector would improve DOI resolution but degrade energy resolution; (2) crystal surface finishing with a diffuse polishing combined with a specular reflector appears a favorable candidate with a good balance of DOI and energy resolution; and (3) the linear and logarithm DOI calculation algorithms show overall comparable DOI error, and the linear algorithm was better for photon interactions near the ends of the crystal while the logarithm algorithm was better near the center. These results provide useful guidance in DER DOI detector design in choosing the crystal surface finishing and DOI calculation methods.
authors.affiliation: Department of Engineering Physics, Tsinghua University, Beijing, People's Republic of China. Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing, People's Republic of China.
authors.forename: Peng
authors.initials: P
authors.lastname: Fan
authors.forename: Tianyu
authors.initials: T
authors.lastname: Ma
authors.forename: Qingyang
authors.initials: Q
authors.lastname: Wei
authors.forename: Rutao
authors.initials: R
authors.lastname: Yao
authors.forename: Yaqiang
authors.initials: Y
authors.lastname: Liu
authors.forename: Shi
authors.initials: S
authors.lastname: Wang
mesh_terms: D000465:Algorithms; D017785:Photons; D049268:Positron-Emission Tomography / Q000295:instrumentation* / Q000379:methods