RT Journal Article SR Electronic T1 A Modified Composite Video Signal Generator for the Gamma 11 Computing System JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 838 OP 840 VO 24 IS 9 A1 Robert L. Richardson A1 William H. Bettinger YR 1983 UL http://jnm.snmjournals.org/content/24/9/838.abstract AB