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Figure 4 Shown is a patient with a high-grade stenosis of the left anterior descending coronary artery. (A) Transaxial computed tomography image (0.75-mm slice thickness) showing the stenosis, which involves the left anterior descending coronary artery and the relatively large diagonal branch. (B) In a 5-mm thick maximum intensity projection (transaxial orientation), the stenosis is more readily seen (arrow). Again, it can be seen that the stenosis involves the ostium of the left anterior descending coronary artery and a large diagnonal branch in this bifurcation. (C) Curved multiplanar reconstruction of the left anterior descending coronary artery (larger arrow) shows the stenosis and the involvement of the side branch (smaller arrow). (D) Three-dimensional reconstruction ("volume rendering technique"). The stenosis of the left anterior descending coronary artery proximal to the bifurcation is clearly visible (arrow). However, the limited spatial resolution of the 3-dimensional reconstruction fails to demonstrate the presence of ostial stenoses of the 2 bifurcation branches. (E) Invasive coronary angiogram.
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