Uniformity correction for SPECT using a mapped cobalt-57 sheet source
As little as 1% nonuniformity of the scintillation camera can produce disturbing artifacts in SPECT images. To correct for nonuniformity, acquired images must be divided by the flood-field image of a uniform sheet source. The refillable /sup 99m/Tc sheet source requires meticulous preparation before each use, and is subject to spillage. The authors propose the use of a permanent /sup 57/Co solid sheet source in conjunction with a map of the radioactivity distribution in the source. The flood-field image of the cobalt source is converted by the map into the equivalent of a flood-field image of an almost perfectly uniform source. An accurate and reproducible method is described for generating a map of the cobalt sheet source from images of it made in multiple positions with the scintillation camera. The mapping process is independent of sensitivity variations across the face of the camera.
- Research Organization:
- Indiana Univ. School of Medicine, Indianapolis
- OSTI ID:
- 5836095
- Journal Information:
- J. Nucl. Med.; (United States), Journal Name: J. Nucl. Med.; (United States) Vol. 26:4; ISSN JNMEA
- Country of Publication:
- United States
- Language:
- English
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62 RADIOLOGY AND NUCLEAR MEDICINE
BETA DECAY RADIOISOTOPES
CAMERAS
COBALT 57
COBALT ISOTOPES
COMPUTERIZED SIMULATION
COMPUTERIZED TOMOGRAPHY
DAYS LIVING RADIOISOTOPES
DIAGNOSTIC TECHNIQUES
ELECTRON CAPTURE RADIOISOTOPES
EMISSION COMPUTED TOMOGRAPHY
GAMMA CAMERAS
IMAGE PROCESSING
IMAGES
INTERMEDIATE MASS NUCLEI
ISOTOPES
MAPPING
NUCLEI
ODD-EVEN NUCLEI
PARTICLE SOURCES
POSITRON SOURCES
PROCESSING
RADIATION SOURCES
RADIOISOTOPES
SIMULATION
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
TOMOGRAPHY