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Radiology, Vol 146, 505-507, Copyright © 1983 by Radiological Society of North America

ARTICLES

Artifacts in iodine-131 renal images due to coincidence summing of technetium-99m photons

CC Harris, RH Wilkinson Jr and FR Schuler

Technetium-99m gamma camera images of kidneys produced with an iodine- 131 energy window showed "ghosts" over and between the kidneys and between the kidneys and the bladder. The cause was coincidence summing at 281 keV due to a high 99mTc counting rate. In older model cameras careful peaking with a proper energy window reduces this effect; more recently developed cameras with pileup rejection circuits do not have this problem.




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