Methods:16s and 28s protocol for cerebral CTA and CTV was proposed according to the time density curves of internal carotid artery (ICA) and Galen vein of 47 volunteers.

• 方法:参照47例患者脑颈内动脉、大脑大静脉时间密度曲线,选择16s和28s为脑动、静脉成像扫描延迟时间。