RT Journal Article SR Electronic T1 A Low-Cost Simulator for Testing the Respiratory Gating Function of the Brattle Physiological Synchronizer JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 574 OP 575 VO 21 IS 6 A1 Robert L. Richardson YR 1980 UL http://jnm.snmjournals.org/content/21/6/574.abstract AB