Time-of-flight positron imaging and the resolution improvement by an iterative method
A simple time-of-flight (TOF) positron imaging method is proposed, in which any computed tomographic algorithm is not utilized but the spatial resolution obtained with the TOF information is improved by a new iterative algorithm. The prototype has a pair of opposed detectors using BaF/sub 2/(2x2x2cm/sup 3/) and photomultiplier tubes (18.5 mm dia.). The TOF resolution (FWHM) measured was 330 ps which corresponds to 5.0 cm of spatial resolution for source localization between the detectors. The spatial resolution can be improved by a factor of about two by eight iterations for a point source by the new iterative algorithm. The algorithm is made with modifications of Bayesian deconvolution algorithm. For more complex sources, it takes more iterations (for example eighty times), however the algorithm is about five times faster than the original Bayesian algorithm.
- Research Organization:
- National Institute of Radiological Sciences, Chiba (JP); Hamamatsu Photonics K.K., Hamamatsu (JP)
- OSTI ID:
- 6279855
- Report Number(s):
- CONF-881103-
- Journal Information:
- IEEE Trans. Nucl. Sci.; (United States), Journal Name: IEEE Trans. Nucl. Sci.; (United States) Vol. 36:1; ISSN IETNA
- Country of Publication:
- United States
- Language:
- English
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ALGORITHMS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM FLUORIDES
COMPUTERIZED TOMOGRAPHY
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IMAGE PROCESSING
ITERATIVE METHODS
MATHEMATICAL LOGIC
MEASURING INSTRUMENTS
POSITRON COMPUTED TOMOGRAPHY
PROCESSING
RADIATION DETECTORS
RESOLUTION
SPATIAL RESOLUTION
TIME-OF-FLIGHT METHOD
TOMOGRAPHY