Abstract
Our group has built the MRI compatible PET insert Hyperion IID, which is based on digital silicon photomultipliers [digital photon counters (DPCs)]. We characterized its performance for two different scintillator configurations already in previous publications. For this paper, we reused the raw detector data that were used in previous publications and stored for offline analysis. We reprocessed these data in order to improve the timing performance of the PET scanner. Different crystal delay and time walk calibration and correction methods are evaluated with respect to the coincidence resolving time (CRT) of the scanner. For all applied correction methods, we report CRTs both for a preclinical and a clinical scintillator configuration for all DPC trigger schemes and several energy windows. The newly obtained results were compared with the previously published values, and the additional benefit of using a time walk correction was evaluated. Previously published CRTs could be improved using a refined version of the original crystal delay calibration method without applying a walk correction by 6.3%–10.9% for a wide energy window ranging from 250–625 keV, and we could show an additional improvement of up to 2.6% by adding a walk correction. Using trigger scheme 1 and a very narrow energy window around the photopeak (500–520 keV), we could reach CRT values on system level of 208/240 ps for the clinical/preclinical scintillator configuration.
Highlights
O UR group has built the Hyperion IID PET insert, which aims at preclinical imaging and can be inserted into and operated simultaneously with a standard clinical 3-T MRI scanner (Philips Achieva) [1]–[3]
The crystal delay maps for the preclinical configuration obtained by reapplying the original crystal delay method
The maps show the crystal delay maps for trigger schemes 1–4 using the original method and having reprocessed the raw data. These maps were applied to all 60 stacks of the preclinical configuration
Summary
O UR group has built the Hyperion IID PET insert, which aims at preclinical imaging and can be inserted into and operated simultaneously with a standard clinical 3-T MRI scanner (Philips Achieva) [1]–[3]. Manuscript received August 14, 2016; revised December 14, 2016; accepted January 13, 2017. Date of publication January 26, 2017; date of current version March 24, 2017.
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