RT Journal Article SR Electronic T1 Orbit-Related Variation in Spatial Resolution as a Source of Artifactual Defects in Thallium-201 SPECT JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 871 OP 875 VO 32 IS 5 A1 Maniawski, Piotr J. A1 Morgan, Hugh T. A1 Wackers, Frans J. Th. YR 1991 UL http://jnm.snmjournals.org/content/32/5/871.abstract AB