chapter  3
12 Pages

Radiation Dose in Computed Tomography

ByMichael F McNitt-Gray

The purpose of this chapter is to provide a discussion of

radiation dose in X-ray computed tomography (CT), with

specific application to CT of the cardiovascular system.

Although CT represents a small percentage of radiological

procedures performed, CT contributes a significant amount

to the collective effective radiation dose from all radiological

procedures.1 Rapid advances in CT technology have

increased both the utility and utilization of CT in many

clinical diagnostic applications. Specifically, as tube rotation

times climbed to the 0.5 second range and as the number of

detector rows first reached 16 and then continued on to

64, the ability to perform CT scans for the coronary arteries

has increased dramatically.2-4 This has led to a significant

increase in the number of patients being scanned for

cardiovascular problems, both in a screening and diagnostic