We are exploring dichroic filters as a way to categorize photons by wavelength with a negligible photon loss. We have demonstrated the capability of Cherenkov and scintillation separation in simulations, and we will present some results with our TOF-PET coincidence prototype featuring dichroic filters. Acknowledgement: This work was supported by the National Institute of Biomedical Imaging and Bioengineering of the National Institute of Health under grant R21EB032999.

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Page 763 of 1274 MIC 2023 IEEE NSS MIC RTSD | Abstract Booklet 9 November, 2023 M-10-017 Improving the timing resolution of a time-of-flight and depth-ofinteraction PET array detector (#1548)

Xiaoyu Zhang1, Linfeng Liu2, Chien-Min Kao3, Fei Wang2, Qingguo Xie1,2 1 Huazhong University of science and technology, Wuhan National Laboratory for Optoelectronics, Wuhan, China; 2 Huazhong University of science and technology, College of Life Science & Technology, Wuhan, China; 3 University of Chicago, Department of Radiology, Chicago, USA; 4 Huazhong University of science and technology, Wuhan National Laboratory for Optoelectronics, Wuhan, China Abstract Recently, silicon photomultiplier (SiPM) has emerged as the photodetectors of choice for PET, due to its small size and performance characteristics. A well-studied design for depth-of-interaction (DOI) and time-of-flight (TOF) capable PET detectors is the individual, double-ended light readout of small, pixelated scintillators. An NxN array detector of this kind has 2NxN SiPMs, which poses a challenge in readout. We previously proposed using a