How Can an Updated 320 Multi Detector Computed Tomography Low Dose Protocol Help in Assessment of Coronary Heart Disease

Abstract

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.