目的探讨９９ｍＴｃＤＴＰＡ肾动态显像诊断小儿肾盂积水的临床价值。方法常规９９ｍＴｃＤＴＰＡ肾动态显像方法，１５分钟后静脉注射速尿，共检查肾盂积水患儿４５例，其中７例作手术前后比较。定量分析指标包括：肾血流灌注率（ＢＰＲ），高峰摄取率（ＰＵＲ），半排泄时间（Ｔ１／２）。结果①ＢＰＲ随积水程度加重而明显下降，重度积水为１６８％±６８％，中度积水为３５１％±６９％，轻度积水为４０６％±９２％。ＰＵＲ在重度积水时为２１６％±１２９％。②７例患儿中６例术后ＢＰＲ明显升高。术前、术后Ｔ１／２分别为４１３±２０４和２２９±１１９分钟。术后Ｔ１／２明显改善。结论①ＢＰＲ可正确反映肾盂积水和肾功能受损程度，两者呈正相关；②术后肾功能改善情况和速尿介入能正确判断集尿系统有无梗阻存在 Objective To investigate the clinical value of 99mTcDTPA renal dynamic imaging in the diagnosis of pediatric hydronephrosis. Methods Conventional 99mTc DTPA renal dynamic imaging method, intravenous furosemide 15 minutes later, a total of 45 cases of hydronephrosis in children, of which 7 were compared before and after surgery. Quantitative analysis of indicators include: renal perfusion rate (BPR), peak uptake rate (PUR), semi-excretion time (T1 / 2). Results (1) The BPR decreased significantly with the increase of waterlogging, with severe water loss of 168% ± 68%, moderate water loss of 351% ± 69% and mild water loss of 406% ± 9  2%. PUR was 21.6% ± 12.9% in severe waterlogging. ② 7 cases of children with postoperative BPR significantly increased. Preoperative and postoperative T1 / 2 were 413 ± 204 and 229 ± 119 minutes, respectively. T1 / 2 after operation was significantly improved. Conclusion ①BPR can correctly reflect the degree of hydronephrosis and impaired renal function, the two are positively correlated; ② postoperative improvement of renal function and furosemide intervention can correctly determine the presence or absence of obstruction urine collection system