Predicting angiographic narrowing > or = 50% in diameter in each of the three major arteries by amounts of calcium detected by electron beam computed tomographic scanning in patients with chest pain.

The evaluation of calcium of the coronary arteries on a vessel-by-vessel basis by use of electron beam computed tomography was useful in obstructed coronary arteries. The absence of coronary calcification in any vessel was highly specific for the absence of an obstructive lesion.