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Figure 1 (a) The first pass of an intravenous contrast agent bolus of gadolinium complex of diethylenetriamine pentaacetic acid (Gd-DTPA) through the right ventricle (RV) and left ventricle (LV) is shown in a short-axis view on 3 frames, out of a total of 50 for each slice, acquired by T1-weighted fast magnetic resonance imaging with a temporal resolution of 1 frame per heartbeat at each of 3 slice levels. (b) The myocardial signal enhancement in 1 of 8 myocardial sectors, located in the inferior wall, for baseline and hyperemia is analyzed by model-independent deconvolution with the respective arterial inputs, shown in c. The solid line in b represents the myocardial response calculated from the estimated tissue impulse response by convolution with the measured arterial input. SI = signal intensity.