A representative case of ultra-low-dose CCTA. The figures show CCTA images of a 69-year-old male (160 cm, 61 kg), which were obtained with ECG-triggered prospective high-pitch helical acquisition (pitch, 3.2) and ultra-low tube potential of 70 kVp using a photon-counting detector CT scanner. The heart rate during the scan was 56 bpm. The CTDIvol and DLP for CCTA was 1.97 mGy and 32.6 mGy·cm (estimated effective dose 0.46 mSv), respectively. No coronary artery stenoses are present on CCTA images. (A) Curved multiplanar reconstruction of right coronary artery. (B) Curved multiplanar reconstruction of left anterior descending coronary artery. (C) Curved multiplanar reconstruction of left circumflex coronary artery. (D) Transaxial image (0.4 mm slice thickness) at the level of the mid-right coronary artery. (E–G) Cinematic volume rendering image of the heart and coronary arteries. CCTA, coronary computed tomography angiography; ECG, electrocardiogram; CTDIvol, computed tomography dose index volume; DLP, dose-length product.