KEY TEACHING POINTS

•Arrhythmia is no longer considered a relative contraindication for coronary computed tomography angiography when local expertise and equipment allow. •Diagnostic-quality image sets can be achieved by postprocessing relatively arrhythmia-free acquisition slabs and combining them for separate coronary artery segments. •Computed tomography radiation dose for scan acquisition during arrhythmia is lower for prospectively electrocardiogram-triggered scan as compared to retrospectively electrocardiogram-gated scan.