Abstract
In small animal and organ dedicated PET scanners, the knowledge of depth of interaction (DOI) of the gamma ray along the main axis of the scintillator is a fundamental information in order to avoid parallax error and to achieve high performances in terms of spatial resolution. Recently we developed a new method to obtain the DOI function for a single side readout PET module, recirculating the scintillation light in the matrix by means of a mirror placed on top of the module. In a complete PET scanner, periodical DOI calibrations have to be performed to prevent time dependent miscalibrations and performance degradations. The current DOI calibration relies on a coincidence system between the module and an external scintillator to provide a priori the DOI information and it is clearly not feasible in a real system without unpractical disassemblies of the scanner. In this paper we develop instead a fast and precise calibration method based on uniform irradiation of the scintillators. Three irradiation modalities are presented, in particular one where the source is placed on top of the module, one with the source placed on one side of the module and one that exploits the internal radioactivity of the scintillator. The three different procedures are evaluated and the calibration method is validated by comparing the information provided by the coincidence setup.
Highlights
Development and evaluation of a practical method to measure the Depth of Interaction function for a single side readout PET detector
: In small animal and organ dedicated PET scanners, the knowledge of depth of interaction (DOI) of the gamma ray along the main axis of the scintillator is a fundamental information in order to avoid parallax error and to achieve high performances in terms of spatial resolution
We developed a new method to obtain the DOI function for a single side readout PET module, recirculating the scintillation light in the matrix by means of a mirror placed on top of the module
Summary
Development and evaluation of a practical method to measure the Depth of Interaction function for a single side readout PET detector. This content has been downloaded from IOPscience. Ghezzi et al A new method for depth of interaction determination in PET detectors M Pizzichemi, G Stringhini, T Niknejad et al DOI calibration for PSAPD PET detectors Yongfeng Yang, Jinyi Qi, Yibao Wu et al Assessment of the Contrast to Noise Ratio in PET Scanners with Monte Carlo Methods C M Michail, G E Karpetas, G P Fountos et al Development of a prototype PET scanner with depth-of-interaction measurement using solid-state photomultiplier arrays and parallel readout electronics Yiping Shao, Xishan Sun, Kejian A Lan et al Preliminary study of depth of interaction measurement for a PET detector Liao Yan-Fei, Zhang Zhi-Ming, Li Dao-Wu et al Preliminary evaluation of a monolithic detector module for integrated PET/MRI scanner with high spatial resolution R. The three different procedures are evaluated and the calibration method is validated by comparing the information provided by the coincidence setup
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