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【目的】探讨不同造影剂注射方案对头颈部动脉 CT 血管造影扫描图像质量的影响。【方法】随机选择本院收治的需要进行头颈部动脉造影的112例患者，将其分为观察组和对照组；每组各56例。观察组采用下肢团注造影剂方法，对照组采用上肢团注造影剂方法。原始数据采用容积再现、最大密度投影及多平面重组技术进行后处理，观察各部位血管 CT 值及血管显像质量，对比两组患者头颈部动脉血管显像质量，并采用主观评分3级评分法评估图像质量。【结果】观察组双侧颈总动脉 CT 值显著低于对照组，差异具有统计学意义(P <0.05)；观察组双侧锁骨下动脉、颈总动脉起始部、头臂干血管显像评分优于对照组，差异具有统计学意义(P 0.05).However,both the readers noticed a better image quality in Group A because of the intravenous CM artifact reduction.There is also a significant difference between the image score of Group A and Group B (P <0.01).[Conclusion]The study indicates that the lower extremity vein CM injection method can greatly reduce the artifact caused by the intravenous CM as well as improve vessel visibility of the arteries near veins-especially for common carotid artery and subclavian artery.