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Time-of-flight positron imaging and the resolution improvement by an iterative method

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8 Author(s)
Yamamoto, M. ; Nat. Inst. of Radiol. Sci., Chiba, Japan ; Nohara, N. ; Tanaka, E. ; Tomitani, T.
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A simple time-of-flight (TOF) positron imaging method is proposed in which the spatial resolution obtained with TOF information is improved by a novel iterative algorithm. The prototype has a pair of opposed detectors using BaF2 (2×2×2 cm3) and photomultiplier tubes (18.5-mm diameter). The measured TOF resolution full width at half maximum was 330 ps, which corresponds to 5.0 cm of spatial resolution for source localization between the detectors. Eight iterations with the algorithm improve the spatial resolution by a factor of about two for a point source. The algorithm is based on modifications of a Bayesian deconvolution algorithm. For more complex sources, it takes more iterations (e.g. 80); however the algorithm is about five times faster than the original Bayesian algorithm

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Nuclear Science, IEEE Transactions on  (Volume:36 ,  Issue: 1 )