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Objective To study the image quality and radiation dose of 100kVp and 400mA CT imaging in patients undergoing coronary CT angiography (CCTA) with adaptive statistical iterative reconstruction (ASiR) technique.Methods From september to december 2011,101 patients suspected of coronary artery disease were scanned by GE Discovery CT750 HD with retrospectively ECG-gated reconstruct scan mode,whose body weight was less than 80 kg.