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3. ECG dose modulation recent study using 16 slice MDCT with retrospective ECG-gating and tube current modulation showed 47% dose reductions in CT coronary angiography 
Average effective doses for males and females were 8.1 and 10.9 mSv respectively without and 4.3 and 5.6 mSv with tube modulation .
Trabold T, Buchgeister M, Kuttner A, et al. Estimation of radiation exposure in 16-detector row computed tomography of the heart with retrospective ECG-gating. Fortschr Rontgenstr 2003; 175: 1051-1055.
4. prospective gating
8. SnapShot Pulse Coronary CTA Dose vs BMI Distribution 123 patients