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Design and Evaluation of Dual-ended Detectors for PET Mammography

Current positron emission mammography (PEM) depth of interaction (DOI) enabling detectors have low scintillator to photodetector encoding ratios, RE causing high system complexity and cost. The modularized dual-ended readout block (DERB) detector combines the Anger logic block detector with dual-ended readout to increase RE while measuring DOI. To investigate the trade-off between RE and spatial resolution, scalable
DERB detectors with varying RE and light guide thickness were modelled with Monte-
Carlo. Simulation showed RE can increase up to six-fold compared to the dual-ended readout design without significantly degrading spatial resolution. Experimental characterization of a RE = 9 : 8 DERB detector was found to achieve super-resolution <0.5 mm for resolving crystal indices, DOI resolution of ~5 mm FWHM, and mean energy resolution of 20% without recovering photons lost to neighbouring detector modules. The model was validated by agreement of simulation results adjusted for detector quantum efficiency with experimental results.

Identiferoai:union.ndltd.org:TORONTO/oai:tspace.library.utoronto.ca:1807/30563
Date06 December 2011
CreatorsCuddy, Sarah Grace
ContributorsRowlands, John A.
Source SetsUniversity of Toronto
Languageen_ca
Detected LanguageEnglish
TypeThesis

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