Fig. 5
Coronary distensibility of two suspected coronary artery disease (CAD) patients measured with coronary MR angiography (MRA). a Images in a 55-year-old male suspected CAD patients. Peripheral blood pressure was 140/92 mm Hg (pulse pressure = 48 mm Hg). The X-ray coronary angiography (CAG) image shows significant stenoses in the proximal and middle left anterior descending artery (LAD). Coronary MRA images show slight coronary distensibility in LAD: lumen area 7.28 mm2 at diastole and 7.89 mm2 at systole, coronary distensibility index (CDI) = [(7.89 − 7.28)/(7.28/48)] × 1000 = 1.75 mm Hg−1. b Images in a 63-year-old male suspected CAD patients. Peripheral blood pressure was 134/90 mm Hg (pulse pressure = 44 mm Hg). CAG shows a normal LAD without significant stenosis. Coronary MRA images show moderate coronary distensibility in LAD: lumen area 11.79 mm2 at diastole and 14.60 mm2 at systole, CDI = [(14.60 − 11.79)/(11.79/44)] × 1000 = 5.42 mm Hg−1