remarkable reduction of exposure rate in patients with stress-only myocardial perfusion scan: let’s safe mankind from unjustified radiation exposure

introduction: to measure radiation exposures rate in low-risk patients having stress-only and stress-rest myocardial perfusion imaging. methods: this was a prospective study conducted from january 2012 till november 2012 upon patients with low pre-test probability for coronary artery disease (cad). a stress mpi (stress-only if mpi is normal and no resting study) followed by a resting mpi study (same day) if stress study was positive or equivocal. exposure rates (in milli-roentgen/hour, mr/hr) from injected patients at 1 meter distance were measured at 10 minutes, 1 hour and at time of releasing patients in both groups. results: total 369 patients were included and 104 (28%) patients had stress-only and 265 (72%) had stress-resting studies. mean administered 99mtc-mibi dose in stress-only and stress-rest groups was 8 ±1 mci and 24 ±03 mci respectively (p