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Figure 1 Angiographically nonobstructive lesion of the left anterior descending artery. (A) Invasive angiogram: arrow indicates a nonobstructive smooth lesion. (B) 64-slice computed tomography: arrowheads indicate a noncalcified plaque in the left anterior descending artery. (C) Intravascular ultrasound: longitudinal reconstruction. (D) Intravascular ultrasound cross section: lumen area 4 mm2, plaque area 11 mm2. (E) Cross-sectional view of the coronary vessel. (F) Window setting for lumen measurements: width is reduced to 1 HU, window level is set to 65% (210 HU in this case) of the mean intensity measured in the lumen. (G) Window level to determine outer vessel boundaries (width at 155% of mean value within the lumen, level at 65% of mean value). Lumen area is 4 mm2, plaque area is 1 mm2.
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