A new method to reduce radiation exposure during multi-row detector cardiac computed tomographic angiography.

Unnecessary exposure to radiation is a major concern in cardiac computed tomographic angiography (CTA) and there have been several methods proposed to reduce radiation exposure in this imaging modality. One method that has not received much attention is the methodology of more precisely defining the upper and lower limits of the scan volume, as starting too high and/or going too low will proportionally add to the dose. We present our experience of performing CTA studies in our institution by better defining these scanning points.