Title :
Time-of-flight positron imaging and the resolution improvement by an iterative method
Author :
Yamamoto, M. ; Nohara, N. ; Tanaka, E. ; Tomitani, T. ; Murayama, H. ; Sato, N. ; Omura, T. ; Tsuchiya, Y.
Author_Institution :
Nat. Inst. of Radiol. Sci., Chiba, Japan
fDate :
2/1/1989 12:00:00 AM
Abstract :
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
Keywords :
computerised tomography; radioisotope scanning and imaging; BaF2; Bayesian deconvolution algorithm; iterative method; opposed detectors; photomultiplier tubes; positron imaging method; resolution improvement; spatial resolution; time-of-flight; Bayesian methods; Deconvolution; Image resolution; Iterative algorithms; Iterative methods; Positrons; Prototypes; Solid scintillation detectors; Spatial resolution; Tomography;
Journal_Title :
Nuclear Science, IEEE Transactions on
