CT image acquisition
All CT examinations were performed on a 320‐row CT scanner (uCT 960+; United Imaging Healthcare; Shanghai; China) with prospective electrocardiography (ECG)‐gating in axial scan mode, where the acquisition was completed in one single heartbeat. As in the majority of routine cases, beta‐blockers were not used. All patients were trained for breath‐holding.The scan range covered the entire heart, from 1 cm below the carina up to the diaphragm, corresponding to a z‐coverage of 12 , 14 , or 16 cm depending on the patient's heart size. The gantry rotation time was 0.25 s. Contrast medium with an iodine concentration of 350 mg/mL (Ioversol, Bayer) was used for all patients with 10‐s injection time, followed by 40 mL of saline solution. Data acquisition was triggered using a bolus tracking technique, which the region of interest (ROI) was set on the descending aorta at 1 cm below the tracheal bifurcation, with a triggering threshold of 100 Hounsfield Units (HU) and 6 s delay time. The optimal cardiac phase was automatically selected based on the measured ECG signal (ePhase; United Imaging Healthcare; Shanghai; China).After scan, an artificial intelligence (AI)‐based software algorithm (CardioCapture; United Imaging Healthcare; Shanghai; China) was used for motion correction.