I had a ct scan 64 slice a year or so ago, and the ct scan software evaluates and provides a score for the amount of soft plaque
in each of the 4 coronary vessels
and a total score. My total score was over 1000,
and the prognosis with that score is projected (20%) to have a risk of a serious heart event within a year So it is possible to have significant CAD and have reasonably clear vessels for blood flow.