Compensation for collimator divergence in SPECT using inverse Monte Carlo reconstruction
The Inverse Monte Carlo (IMOC) reconstruction algorithm achieved compensation for two degrading collimator effects in SPECT imaging: position dependence and radial/tangential asymmetry in reconstructed resolution. With filtered backprojection using a ramp filter, Full Width at Half Maximum (radial and tangential respectively) for a line source on axis with a high sensitivity collimator were 19.3mm and 16.4mm. At 12cm off axis, FWHM were 14.8mm and 8.2mm respectively. With IMOC after 35 iterations, FWHM on axis were 8.4mm and 7.7mm while off axis FWHM were 6.0mm and 7.4mm respectively. Thus, for the simple imaging task of line sources with no background activity using simulated projection data, IMOC provides compensation for the collimator effects in addition to providing higher resolution.
- Research Organization:
- Duke Univ. Medical Center, Box 3949, Durham, NC (US)
- OSTI ID:
- 7146337
- Report Number(s):
- CONF-871006-
- Journal Information:
- IEEE Trans. Nucl. Sci.; (United States), Journal Name: IEEE Trans. Nucl. Sci.; (United States) Vol. 35:1; ISSN IETNA
- Country of Publication:
- United States
- Language:
- English
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ALGORITHMS
BACKSCATTERING
BEAM DYNAMICS
COLLIMATORS
COMPUTERIZED TOMOGRAPHY
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
FILTERS
IMAGE PROCESSING
IMAGE SCANNERS
ITERATIVE METHODS
MATHEMATICAL LOGIC
MONTE CARLO METHOD
POSITIONING
PROCESSING
RESOLUTION
SCATTERING
SENSITIVITY
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
TOMOGRAPHY