Hybrid Pixel-Waveform (HPWF) Enabled CdTe Detectors for Small Animal Gamma-Ray Imaging Applications

IEEE Transactions on Radiation and Plasma Medical Sciences
A GrollL J Meng

Abstract

This paper presents the design and preliminary evaluation of small-pixel CdTe gamma ray detectors equipped with a hybrid pixel-waveform (HPWF) readout system for gamma ray imaging applications with additional discussion on CZT due to its similarity. The HPWF readout system utilizes a pixelated anode readout circuitry which is designed to only provide the pixel address. This readout circuitry works in coincidence with a high-speed digitizer to sample the cathode waveform which provides the energy, timing, and depth-of-interaction (DOI) information. This work focuses on the developed and experimentally evaluated prototype HPWF-CdTe detectors with a custom CMOS pixel-ASIC to readout small anode pixels of 350 μm in size, and a discrete waveform sampling circuitry to digitize the signal waveform induced on the large cathode. The intrinsic timing, energy, and spatial resolution were experimentally evaluated in this paper in conjunction with methods for depth of interaction (DOI) partitioning of the CdTe crystal. While the experimental studies discussed in this paper are primarily for evaluating HPWF detectors for small animal PET imaging, these detectors could find their applications for ultrahigh-resolution SPECT and other imaging m...Continue Reading

Citations

Jan 25, 2018·Physics in Medicine and Biology·Gerard Ariño-EstradaSimon R Cherry
May 5, 2018·Physics in Medicine and Biology·Gerard Ariño-EstradaGregory S Mitchell
Jul 25, 2018·Physics in Medicine and Biology·Kyungsang KimQuanzheng Li
Jul 26, 2019·Physics in Medicine and Biology·Gerard Ariño-EstradaSimon R Cherry
Jun 2, 2018·Seminars in Nuclear Medicine·Eric Berg, Simon R Cherry

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