目的 探究非增强CT值在预测体 外冲击波碎石术(extracorporeal shock wave lithotripsy，ESWL)治疗肾结石的 应用价值研究，为体外冲击波碎石疗效预 测提供理论依据。方法 本研究纳入对象 为2016年4月-2017年4月于我院接受ESWL 治疗的120例肾结石患者，术前采用非增 强CT进行结石软组织窗CT值的测定，按CT 值≤500HU、500-1000HU、≥1000HU分为 低(49例)、中(36例)、高密度组(35例)， 所有患者均采用ESWL治疗，比较三组患者 碎石效果，记录三组患者ESWL次数以及平 均冲击次数。结果 低密度组碎石无效、 碎片残留率最低，碎石有效率最高，三组 碎石无效、碎片残留率、碎石有效率差异 显著，组间两两比较差异具有统计学意义 (P<0.05)，低密度组结石粉碎率最高，显 著高于中、高密度组，差异具有统计学意 义(P<0.05)，中、高密度组结石粉碎率差 异无统计学意义(P>0.05)；低密度组平均 冲击次数、ESWL次数、CT值最低，三组比 较差异显著，组间两两比较差异具有统计 学意义(P<0.05)。结论 不同非增强CT值 肾结石患者ESWL治疗效果差异显著，临床 可运用非增强CT值预测ESWL治疗效果，为 肾结石治疗方案的确定提供理论依据。

Objective To investigate the application value of non-contrast CT (NCCT) in the outcomes prediction of extracorporeal shock wave lithotripsy (ESWL) for renal stone, and to provide a theoretical basis for the curative effect prediction of ESWL. Methods In this study, 120 patients with renal stone underwent ESWL in our hospital from April 2016 to April 2017 were enrolled. The CT value ranges of the soft tissue window were determined by NCCT, patients were divided into three groups according to the CT values, namely low-density group (49 cases), middle-density group (36 cases), highdensity group (35 cases) with CT values ranging from ≤ 500 HU, 500 -1000 HU, ≥ 1000 HU respectively. All patients underwent ESWL, and the stone crushing rate, the sessions of lithotrispy and shock wave number were recorded and compared among the three groups. Results The low-density group had the lowest invalid rate, calculi residual rate, and the highest efficiency rate, the comparison of the invalid rate, calculi residual rate and efficiency rate among three groups showed a significant difference, moreover the paired comparison showed statistic difference(P<0.05). The stone free rate of the lowdensity group was the highest, which was significantly higher than that of the middle and high-density group(P<0.05), no statistic difference was found between the middle and high density group(P>0.05). The shock wave number, sessions of lithotrispy and CT values was lowest in the low-density group, the difference of the three groups was significant, and the paired comparison had statistically significant difference(P<0.05). Conclusion The curative effect of ESWL for renal stone varies with the CT value, suggesting that the application of NCCT can predict the curative effect of ESWL, and provide a theoretical basis for the treatment of renal stone.