Ultra-low-dose CT coronary angiography using 128-slice dual source CT with low concentration contrast agent: initial experience

摘要

Abstract Purpose To optimize and evaluate an ultra-low-dose (ULD) technique for CT coronary angiography (CTCA). Materials and methods Eighty-two patients were randomly divided into two groups. ULD and routine CTCA were performed in groups A and B. Image quality, radiation dose and contrast agent were evaluated. Results The effective dose (ED) was 0.20?±?0.01?mSv for the ULD technique, a decrease of 87% ( t ?=???21.182, P ? t ?=???73.458, P ? χ 2 ?=?0.727, P ?=?0.394). The contrast-to-noise ratio was 19.31?±?7.95 for group A and 20.73?±?5.07 for group B: the difference was not statistically significant ( t ?=???1.678, P ?=?0.095). Conclusion Using an ultra-low radiation dose and contrast agent technique, while maintaining an assessable image and improving the safety of the medical examination, was a feasible and reliable method for CTCA.