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Flying Insect Detection and Classification with Inexpensive Sensors

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A PET detector prototype based on digital SiPMs and GAGG scintillators.

Florian R Schneider¹, Kenji Shimazoe, Ian Somlai-Schweiger

¹Nuklearmedizinische Klinik und Poliklinik, Technische Universität München, Ismaninger Str. 22, 81675 München, Germany. Physik Department E18, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany.

Physics in Medicine and Biology

|January 31, 2015

Summary

Digital Photon Counters (DPCs) show promise for Positron Emission Tomography (PET) imaging. These digital Silicon Photomultipliers (SiPMs) combined with GAGG scintillators offer improved energy resolution for PET detector prototypes.

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Area of Science:

Medical Physics
Instrumentation
Nuclear Medicine

Background:

Silicon Photomultipliers (SiPMs) are key light sensors for Positron Emission Tomography (PET).
Analog SiPMs require external electronics for energy and time determination.
Philips Digital Photon Counting developed Digital Photon Counters (DPCs), fully digital SiPMs with integrated cell-level electronics.

Purpose of the Study:

To evaluate the feasibility of using Digital Photon Counters (DPCs) with LYSO and GAGG scintillators for PET applications.
To characterize the performance of DPC modules in terms of energy and timing resolution.
To assess the potential of DPCs in a PET detector prototype.

Main Methods:

DPC modules, each with 64 channels and 3200 cells, were coupled with LYSO and GAGG scintillator crystals (2x2x6 mm^3).
Coincidence Time Resolution (CTR) and energy resolution were measured at 511 keV for both scintillator types.
A PET detector prototype using DPCs and a GAGG array was assembled and tested using phantom imaging with MLEM reconstruction.

Main Results:

LYSO coupled to DPC yielded a CTR of 171 ps FWHM and energy resolution of 12.6% FWHM.
GAGG coupled to DPC achieved a CTR of 310 ps FWHM and energy resolution of 8.5% FWHM.
The PET prototype with GAGG demonstrated a CTR of 619 ps FWHM and energy resolution of 9.2% FWHM.

Conclusions:

Digital Photon Counters (DPCs) are viable for PET detectors, offering integrated digital readout.
GAGG scintillators coupled with DPCs provide excellent energy resolution, outperforming LYSO in this study.
The DPC technology shows potential for advancing PET imaging systems, particularly with advanced scintillators like GAGG.