Abstract: Objective：To investigate whether CT value combined with entropy can predict the efficacy of extracorporeal shock wave lithotripsy（ESWL）in the treatment of upper ureteral calculi.Methods：A total of 83 patients with upper ureteral calculi who underwent unenhanced multislice spiral CT（MDCT）and extracorporeal shock wave lithotripsy from October 2017 to June 2018 were collected.According to the stone removal effect 4 weeks after treatment，the patients were divided into successful group（n=52）and failure group（n=31）.The success of ESWL was defined as the absence of residual stone fragments or residual stone fragments no larger than 2mm after 4 weeks of single lithotripsy.The basic data of the two groups，such as sex，age and stone diameter，were analyzed and compared.At the same time，the CT value and entropy of stones in the two groups were statistically compared，and the predictive value of stone CT combined with entropy to the therapeutic effect of ESWL was analyzed.Results：31 patients（37%）failed in lithotripsy.There was no significant difference in basic data such as sex，age and stone diameter between the two groups（P>0.05）.The CT value of success group was（691.73±171.34）HU，and that of failure group was（852.74±180.98）HU.There was significant difference between the two groups.The entropy value of success group was（4.25±0.57），and that of failure group was（4.81±0.41）.There was significant difference between the two groups（P<0.05）.According to the CT value and entropy value，the patients were divided into four risk categories：Ct value >750HU and entropy value >4.5（10/29），Ct value ≤750HU and entropy value >4.5（7/13），Ct value >750HU and entropy value ≤4.5（11/14），Ct value ≤750HU and entropy value≤4.5（24/27），the related ESWL stone removal rates were 34.5%，53.8%，78.6% and 88.9%，respectively.Conclusion：The CT value combined with entropy can predict the therapeutic effect of ESWL in patients with upper ureteral calculi.The lower the CT value and entropy value，the higher the stone clearance rate after ESWL treatment.

Key words: extracorporeal shock wave lithotripsy, proximal ureteral stone, CT value, entropy