Figure 3d: Comparison of image postprocessing methods in patient with stenosis of the left circumflex coronary artery confirmed on conventional coronary angiogram. (a) Series of three transverse images (from left to right) above, at the level of, and distal to the lesion (arrow = left circumflex artery). While the contrast-enhanced lumen is clearly visible proximally and distally to the lesion, the middle image shows absence of contrast-enhanced lumen; only one calcification appears. (b) Visualization of stenosis (arrow) in an oblique MPR. (c) Visualization of stenosis (arrow) in an oblique MIP. (d) Curved MPR of left main and left circumflex coronary artery (arrow = stenosis). (e) Curved MIP (3 mm thick) of left main and left circumflex coronary artery (arrow = stenosis). (f) Three-dimensional reconstruction. Stenosis with a calcification (arrow) can clearly be seen.