الفهرس 
IntroductionOnly 14 pages are availabe for public view
Abstract
Coronary computed tomography angiography (CCTA) has become an important tool in the assessment of coronary artery disease its accurate non-invasive method to detect coronary lesions. Recently radiation dose had been a concern among medical community. New acquisition protocols developed to decrease the radiation dose.
This study aims to evaluate the radiation dose and diagnostic accuracy of at both 320-MDCT and 64-MDCT using different acquisition techniques (prospective and retrospective ECG gating techniques).
Radiation dose were measured for 39 patients scanned with prospective and retrospective ECG-gating. All scans were done using the standard injection protocol.
We found that effective radiation dose related to prospective ECG-gating technique were highly significant lower than retrospective technique (7 mSv versus 20 mSv respectively) on 320-MDCT, and comparing both MDCT scanners using same acquisition retrospective ECG-gated technique, the resulting ED was lower in patients undergoing 320-MDCT, with a median ED of 20 mSv compared to patients undergoing 64-MDCT, with a median of 26 mSv.
We settled that prospective ECG-gating protocol effectively reduces radiation dose in 320-MDCT coronary angiography. Also, prospective ECG-gated coronary angiography using 320-MDCT is highly accurate in detection and quantification of the degree of coronary luminal stenosis.