RT Journal Article SR Electronic T1 Nuclear cardiology, Part IV: Viability. JF Journal of Nuclear Medicine Technology JO J. Nucl. Med. Technol. FD Society of Nuclear Medicine SP 93 OP 102 VO 27 IS 2 A1 Mesotten, L A1 Maes, A A1 Hambye, A S A1 Everaert, H A1 Van den Maegdenbergh, V A1 Franken, P A1 Mortelmans, L YR 1999 UL http://tech.snmjournals.org/content/27/2/93.abstract AB After reading Part IV of this series of nuclear cardiology articles, the reader should be able to describe: (a) the differences between SPECT and PET techniques; (b) the various radiopharmaceuticals and imaging protocols used for detecting viability with SPECT; (c) the different radiopharmaceuticals and imaging protocols used for detecting viability with PET; and (d) the imaging patterns observed after reconstructing myocardial images.