CCTA images with the lowest level of radiation exposure. The figures show CCTA images of an 81-year-old female (145 cm, 42 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 64 bpm. The CTDIvol and DLP for CCTA was 0.72 mGy and 11.0 mGy·cm (estimated effective dose 0.15 mSv), respectively. (A) Curved multiplanar reconstruction of right coronary artery. (B) Curved multiplanar reconstruction of left anterior descending coronary artery, which displays a moderate stenosis in the mid segment (arrow). (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.