Contrast administration techniques
CM
CM administration technique is crucial for examination quality in CTA, and there are large variations in protocols. Ren et al used a fixed CM volume of 90 or 45 mL, while Almutairi et al used a weight-tailored CM dosage of 1.5 or 0.75 ml/kg [We replaced the reduced contrast volume in the experimental group with saline, keeping the injected volume, injection rate, CM concentration, and saline chaser unchanged, thus reducing the room for errors. Since we had no weight-based exclusion criteria, our results should be valid for the target population [