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viable myocardial tissue.
Technetium Tc99m decays by isomeric transition with a physical half-life of 6.02 hours.
The myocardial biological half-life is approximately six hours after a rest or exercise injection.
The biological half-life for the liver is approximately 30 minutes after a rest or exercise injection. The
effective half-life of clearance (which includes both the biological half-life and radionuclide decay) for
the heart is approximately 3 hours, and for the liver is approximately 30 minutes, after a rest or exercise injection. The ideal imaging time reflects the best compromise between heart count rate and surrounding organ uptake.
http://www.cardiolite.com/pdfs/cardiolite.pdf