This is a scintillation scan (gamma camera or photoscan) involving the use of thallium-201, a radioisotope.
The radioisotope is administered intravenously and localizes, like calcium, in the myocardium (heart muscle).
A scintillation camera produces an image of the distribution of the radioisotope. Areas of inadequate perfusion (blood flow) appear as "cold spots," thus pinpointing sites of myocardium (heart muscle) at risk.
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