The performance of a PET scanner on three different phantom sizes was studied as a function of low energy threshold (LET). Phantom cross sections ranged from 20 cm diameter circular to 28 cm x 43 cm oval and LET''s ranged from 350 keV to 475 keV, in 25 keV increments. System sensitivity, scatter fraction, and NEC were measured over a wide range of radioactivity levels. Increasing the low energy threshold lowered both sensitivity and scatter fraction. The statistical quality of the raw data was maximized for the 425 keV setting for all three phantoms. System stability and uniformity of response was also studied for 375 keV to 450 keV thresholds, and indicated acceptable performance for this system through 425 keV.
J. W. Wilson et al., "Adjusting the Low Energy Threshold for Large Bodies in PET," IEEE Nuclear Science Symposium Conference Record, 2004, Institute of Electrical and Electronics Engineers (IEEE), Jan 2004.
The definitive version is available at http://dx.doi.org/10.1109/NSSMIC.2004.1466286
Mining and Nuclear Engineering
Keywords and Phrases
20 to 43 Cm; 350 to 475 KeV; PET Scanner; Image Scanners; Low Energy Threshold; Phantom Cross Sections; Phantom Sizes; Phantoms; Positron Emission Tomography; Scatter Fraction; System Sensitivity
International Standard Serial Number (ISSN)
Article - Conference proceedings
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