In isosensitive radioisotope scanning system the delineation of the radioisotope distribution is completely independent of depth. Coupling of 4, 096-word multi-channel analyzer to the isosensitive scanner makes it possible to evaluate radioisotope distribution in vivo quantitatively and provides various new diagnostic tools; for example, spleen/liver ratio, pancreas/liver ratio, profile histogram of lung perfusion scan and tumor net counts in brain scan and so on.
