FIGURE 1. Compartmental model used to fit first 3 min of ¹¹C-acetate tracer activity data. Model assumes that tracer enters freely exchangeable tissue pool at rate of F x E, where F is myocardial blood flow rate and E is extraction fraction for acetate. Tracer in freely exchangeable tissue pool either leaves that compartment and enters metabolically trapped pool with rate constant K₁ or is washed out as function of blood flow.