RT Journal Article SR Electronic T1 Effect of Positron Range on Spatial Resolution JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 649 OP 652 VO 16 IS 7 A1 Phelps, Michael E. A1 Hoffman, Edward J. A1 Huang, Sung-Cheng A1 Ter-Pogossian, Michel M. YR 1975 UL http://jnm.snmjournals.org/content/16/7/649.abstract AB