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Accuracy of CT-derived fractional flow reserve depends on good image quality. Thus, improving image quality during coronary CT angiography (CCTA) is important. To investigate impact of respiratory motion artifact on coronary image quality focusing on vessel diameter and territory during one beat CCTA by a 256-row detector. We retrospectively reviewed patients who underwent CCTA under free-breathing (n = 10 and breath-holding (n = 10, respectively. Coronary image quality is defined as 4-1 from excellent to poor (non-diagnostic) and re
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