A variety of dose-saving strategies have been really helpful, and numerous investigations have proven that radiation dose can be considerably diminished to a level equivalent to (or even lower than) that from invasive coronary angiography, with out compromising image high quality [28,29]. ECG-controlled tube current modulation is one among the best approaches for dose reduction in coronary CT angiography. Effective doses of CCTA as much as 20 mSv have been reported in the literature [29].