Figure 1From: Non-invasive evaluation of myocardial reperfusion by transthoracic Doppler echocardiography and single-photon emission computed tomography in patients with anterior acute myocardial infarction Coronary flow by spectral Doppler. The greater component during diastole and the smaller component during systole at rest (A) and during hyperaemia (B). CFR = b/a. CFR > 2 (an example of normal CFR).Back to article page