本文回顾分析１９８７年３月～１９９２年５月行肾脏ＣＴ扫描１０２例，其中诊断肾结石３１例，当时因ＣＴ扫描前准备方法问题，及开始经验不足造成４例无结石的病人误诊为结石。找到误诊结石的原因是ＣＴ扫描前静脉试验及口服泛影葡胺造影剂造成，采取改进ＣＴ扫描前准备方法；（１）扫描前不行静脉试验（２）口服造影剂改为口服温水或牛奶，经上述改进方法，以后未出现造影剂造成肾结石误诊 This article retrospectively analyzed 102 cases of renal CT scan from March 1987 to May 1992, of which 31 cases were diagnosed with kidney stones. At that time, 4 patients without calculus were misdiagnosed as stones because of the preparation method before CT scan and the lack of experience. The reasons for the misdiagnosis of the stones were found to be caused by pre-CT venous tests and oral administration of meglumine diatrizoate to improve the preparation method of CT scan. (1) No intravenous test before scanning (2) Oral contrast agent was changed to oral warm water or milk, After the above improvement methods, did not appear after the contrast agent caused misdiagnosis of kidney stones