Effect of randoms on signal-to-noise ratio in TOF PET
- 26 June 2006
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Nuclear Science
- Vol. 53 (3) , 1188-1193
- https://doi.org/10.1109/tns.2006.875066
Abstract
Time-of-flight (TOF) positron emission tomography (PET) has the potential to improve signal-to-noise ratio (SNR). In the literature, this improvement has been estimated as proportional to the square root of D//spl Delta/x, where D is the radial dimension of the object to be imaged, and /spl Delta/x is the spatial uncertainty associated with the time resolution of the scanner. This estimate does not include the effect of the randoms. In this paper we discuss the role of random coincidence in TOF PET; in particular, the improvement in SNR due to random reduction in TOF PET. We introduce and discuss a simple model for this improvement, modify the traditional estimate for SNR gain, and compare it to experimental data from a Siemens Hi-Rez PET scanner with TOF capability.Keywords
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