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Abstract
| Heterostructured scintillators are gaining ground as a possible solution to the trade-off between the high sensitivity and fast timing of detectors for time-of-flight positron emission tomography (TOF-PET). They consist of stacks of alternating layers of two materials with complementary properties: high stopping power and ultrafast timing. The fast emitter improves the timing performance of the detector. However, layering is a limiting factor for the best achievable time resolution, as it worsens light transport. This effect can be mitigated by increasing light collection and retrieving the depth-of-interaction (DOI) information. The double-sided readout can meet both requirements.In this work, we use high-frequency electronics in a double-sided readout configuration with a 3x3x20mm3BGO&EJ232; heterostructure. By selecting the photopeak events, we were able to achieve a DOI resolution of 6.4±0.5mm3. The improvement in coincidence time resolution (CTR), compared to the single-sided readout, is 18% for all photopeak events (from 256±8 to 211±6ps) and 36% when considering only photopeak events that share the energy between the two materials (from 200±6 to 128±4ps). |