Manual adjustment of tube voltage from 120 to 100 kVp during abdominal CT in patients with body weights ≤75 kg: assessment of image quality and radiation dose in a prospective, randomised trial.

•Patients weighing ≤75 kg are eligible for 100-kVp abdominal portal-venous CT.•100-kVp abdominal CT reduces radiation dose by 19% compared to 120 kVp.•Image quality of 100-kVp abdominal CT is comparable to 120 kVp.•100-kVp abdominal CT for patients weighing ≤75 kg improves patient safety.