RT Journal Article SR Electronic T1 Calculation of Ejection Fraction in Gated SPECT JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 657 OP 657 VO 44 IS 4 A1 Michael L. Goris YR 2003 UL http://jnm.snmjournals.org/content/44/4/657.1.abstract AB