Controls included the normal contralateral kidneys of 57 consecutive patients who had KUB, US, and NCCT for acute flank pain during the same study period.

• 对照组包括同一研究时间内，连续57位因为急性后腰部疼痛，而进行KUB, US以及NCCT检查的患者，采用他们的对侧正常肾脏，作为对照。