Protocols for radioimaging an event or disorder are provided. An exemplary protocol comprises a method of radioimaging a myocardial perfusion, the method comprising in sequence: (a) administering to a subject about 3 mCi Tl201 thallous chloride; (b) allowing said subject to rest; (c) radioimaging a heart of said subject; (d) subjecting said subject to a physical stress; (e) administering to said subject at a peak of said physical stress about 20-30 mCi Tc99m sestamibi; and (f) radioimaging said heart of said subject, thereby radioimaging a myocardial perfusion.