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Thoracic scan in the anterior view performed 1 hour after administration of 99m-technetium pyrophosphate. (A) There is intense radiotracer accumulation in the myocardium. (B) Region of interest markers placed over the myocardium and contralateral right lung for quantification of radiotracer activity. The total counts within the myocardial region of interest divided by the contralateral counts were used to calculate the heart-to-contralateral ratio.
