title: Imaging and Timing Performance of 1cm × 1cm Position-sensitive Solid-state Photomultiplier.
abstract: We have designed and built a large-area 1cm × 1cm position-sensitive solid-state photomultiplier (PS-SSPM) for use in detector design for medical imaging applications. Our new large-area PS-SSPM concept implements resistive network between the micro-pixels, which are photodiodes operated in Geiger mode, called Geiger Photodiodes (GPDs), to provide continuous position sensitivity. Here we present imaging and timing performance of the large-area PS-SSPM for different temperatures and operating biases to find the optimum operating parameters for the device in imaging applications. A detector module was built by coupling a polished 8×8 LYSO array, with 1×1×20 mm3elements, to a 1×1 cm2PS-SSPM. Flood images recorded at room temperature show good crystal separation as all 64 elements were separated from each other. Cooling the device at 10 °C showed significant improvement. The device optimum bias voltage was ~4.5V over breakdown voltage. The coincidence timing resolution was improved significantly by increasing the operating bias, as well as by lowering the temperature to 0 °C. Results show excellent imaging performance and good timing response with a large-area PS-SSPM device.
authors.affiliation: Radiation Monitoring Devices, Inc. 44 Hunt Street, Watertown, MA 02472, USA.
authors.forename: P
authors.initials: P
authors.lastname: Dokhale
authors.affiliation: Department of Biomedical Engineering, University of California-Davis, Davis, CA 95616, USA.
authors.forename: J
authors.initials: J
authors.lastname: Schmall
authors.affiliation: Radiation Monitoring Devices, Inc. 44 Hunt Street, Watertown, MA 02472, USA.
authors.forename: C
authors.initials: C
authors.lastname: Stapels
authors.affiliation: Radiation Monitoring Devices, Inc. 44 Hunt Street, Watertown, MA 02472, USA.
authors.forename: J
authors.initials: J
authors.lastname: Christian
authors.affiliation: Department of Biomedical Engineering, University of California-Davis, Davis, CA 95616, USA.
authors.forename: S
authors.initials: S
authors.lastname: Cherry
authors.affiliation: Radiation Monitoring Devices, Inc. 44 Hunt Street, Watertown, MA 02472, USA.
authors.forename: M R
authors.initials: MR
authors.lastname: Squillante
authors.affiliation: Radiation Monitoring Devices, Inc. 44 Hunt Street, Watertown, MA 02472, USA.
authors.forename: K
authors.initials: K
authors.lastname: Shah
keywords: Positron Emission Tomography; SSPM; position sensitive SSPM