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Figure 2 Thoracic positron emission tomographic scans depicting (left) myocardial ¹³N-ammonia–derived radioactivity, (middle) 6-[¹⁸F]-fluorodopamine–derived radioactivity, and (right) the ratio of ¹⁸F:¹³N in (top) a normal volunteer and (bottom) a patient with hypertrophic cardiomyopathy, after IV injection of 5 mCi ¹³N-ammonia and then 1 mCi 6-[¹⁸F]-fluorodopamine. Sep = septum; Lat = lateral wall; Ap = apex; LV = left ventricle.