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CMRP Seminar Series
November 29, 2018 @ 11:30 am - 12:30 pm
Sub-nanosecond timing resolution semiconductor detectors for TOF-PET
Gerard Arino Estrada, PhD
High-Z semiconductor radiation detectors as cadmium telluride (CdTe) or cadmium zinc telluride (CZT) have long been studied for positron emission tomography (PET) applications because of their excellent performance in energy and spatial resolution. However, the timing resolution of such devices is several nanoseconds at best, which is far from the sub-nanosecond time-of-flight (TOF) requirements of last generation TOF-PET scanners. Recently, at the University of California, Davis, we have proved the feasibility of using Cerenkov light in thallium bromide (TlBr) to achieve timing resolutions below 500 ps full width at half maximum (FWHM). This is the first-ever high-z semiconductor detector with a timing performance able to provide TOF capabilities. Moreover, TlBr has a detection efficiency 1.8-fold higher than CdTe/CZT for 511 keV photons and expected manufacturing costs well below those of CZT. In this seminar, I will be presenting the latest results on the utilization of Cerenkov radiation for TOF-PET, including the study of generation and transport of Cerenkov photons in TlBr, and the operation of TlBr hybrid detectors that combine, simultaneously, Cerenkov readout and the conventional charge induction readout for semiconductor devices.
Gerard Ariño-Estrada is an Assistant Project Scientist in the Department of Biomedical Engineering of the University of California Davis (UCD, Davis, CA). He obtained his undergraduate degree in physics and his masters degree in mathematical modelling at the Universitat Autònoma de Barcelona (UAB, Barcelona, Spain). He also obtained a PhD in radiation physics at the UAB and the Insitut de Física d’Altes Energies (IFAE, Barcelona, Spain). He then completed postdoctoral training at the Deutsches Elektronen-Synchrotron (DESY, Hamburg, Germany), and later at the UCD. Dr. Ariño-Estrada current research interests are in the utilization of TlBr radiation detectors for medical imaging, with a special focus on TOF-PET. He pioneered the utilization of Cerenkov light in TlBr for very fast timing signals and is PI in an R03 award from the NIH-NIBIB about this topic.