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Figure 1 Typical example of scintigraphic hyperemic reactivity experiments from a control subject (A) and a patient with coronary artery disease (CAD) (B). In the control subject, there is more intense tracer activity in the hyperemic right arm. The parametric ratios derived from the activity-time curves are higher in the control subject with a ratio of maximal upslopes between the hyperemic right arm over the control left arm of 7.7, a ratio of the peak activities of 6.0, and a ratio of integrals between t₀ and t_max of 344. The same values in the CAD patient were lower at 1.3, 1.4, and 11, respectively.