The CT scan measures the soft plaque, mixture of hard and soft
plaque, calcified whatever between the layers of the vessel,
and this the beginning of CAD
and the test would be helpful. When CAD is advanced it the substance between the vessel layer that ruputures, forms a clot, and the clot breaks away causing a heart attack. This occurrence represents about 90% of the heart attacks. The hard plaque within the lumen represents about 10% of heart attacks.