Methods 2480 patiens were retrospectively analyzed including 1860 patiens as the study group who were injected ionic contrast medium with dexamethasone during the course of CT scanning.

• 方法回顾性分析2480例患者中观察组1860例用离子型造影剂加入地塞米松,两药混均后经肘静脉注入进行CT扫描。