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

Volume

36

Issue

1

fYear

1989

fDate

2/1/1989 12:00:00 AM

Firstpage

998

Lastpage

1002

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;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.34592

Filename

34592