“…The principal differences in the techniques now employed are the timing of the pancreatic scan after the injection of isotope and minor variations in the speed of scanning. The time interval between the injection of the isotope and starting the scan varies from immediately following injection (RodriguezAntunez, 1964) to I hour following injection (Zuidema, Kirsch, Turcotte, Gaisford, Powers, and Kowalczyk, 1963). It is now common practice in all centres carrying out pancreatic scans to perform a separate liver scan using a liver-seeking isotope, colloidal gold Ig8Au (Sodee, 1964;Colella and Pignorini, 1967;Melmed and others, 1968) or technetium 99m sulphur colloid (Brown, Sircus, Smith, Donaldson, Dymock, Falconer, and Small, 1968).…”