Radiation Dose from Single-Heartbeat Coronary CT Angiography Performed with a 320–Detector Row Volume Scanner

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Abstract
Volume scanning with a 320–detector row scanner was found to reduce radiation doses at coronary CT angiography by up to 91% in comparison with those at standard helical scanning, with effective doses of 5.8 mSv at 120 kVp and 4.4 mSv at 100 kVp. PurposeTo determine radiation doses from coronary computed tomographic (CT) angiography performed by using a 320–detector row volume scanner and evaluate how the effective dose depends on scan mode and the calculation method used.Materials and MethodsRadiation doses from coronary CT angiography performed by using a volume scanner were determined by using metal-oxide–semiconductor field-effect transistor detectors positioned in an anthropomorphic phantom physically and radiographically simulating a male or female human. Organ and effective doses were determined for six scan modes, including both 64-row helical and 280-row volume scans. Effective doses were compared with estimates based on the method most commonly used in clinical literature: multiplying dose-length product (DLP) by a general conversion coefficient (0.017 or 0.014 mSv·mGy−1·cm−1), determined from Monte Carlo simulations of chest CT by using single-section scanners and previous tissue-weighting factors.ResultsEffective dose was reduced by up...