目的探讨64层螺旋CT平扫结合 输尿管曲面重组图像诊断微小隐匿结石的 临床价值。方法 68例临床高度怀疑输尿 管结石患者，行64层螺旋CT平扫后，重建 0.625mm图像传至CT三维工作站进行曲面 重组（CPR），分别对比观察断层图像及 曲面重组出输尿管的全程图像，了解输尿 管结石的大小、位置。结果 68例中轴位 图像能明确诊断输尿管结石的有53例，15 例因结石体积过小、所处解剖位置受血管 钙化和静脉石等因素影响不能明确诊断， 通过曲面重组后获得了68例输尿管全程图 像，显示了97个输尿管结石，大小约0.3- 0.8cm，其中上段结石32例，中段结石21 例，下段结石44例；右侧30例37个结石， 左侧28例33个结石，双侧10例27个结石。 结论 输尿管曲面重组可以获得良好的输 尿管全程图像，能准确清晰显示输尿管结 石的大小、位置和数量，对输尿管结石的 临床诊断和鉴别诊断具有重要价值。

Objective To assess the clinical value of unenhanced 64-slice spiral CT combining ureteral curved planar reformation(CPR) technique on diagnosis of latent ureteral calculi. Methods 68 patients with ureteral calculi underwent unenhanced 64- slice spiral CT scan. Reconstructed images (slice thickness=0.625mm) were transferred to CT workstation to reformat the whole ureters images by CPR. To observe the location and size of ureteral calculi by comparing axial images and the whole ureters images reformatted by CPR. Results 53 out of all 68 patients were diagnosed ureteral calculi by axial images. Due to small size of calculi, anatomical location affected by vascular calcification and phlebolith, definite diagnosis could not be made by axial images for the other 15 cases. The whole ureters images reformatted by CPR of all 68 patients showed positive results and displayed the size and location of all 97 calculi (0.3-0.8cm), which 32 calculi were located in upper ureters, 21 calculi in middle ureters, 44 calculi in lower ureters. 30 cases of 37 calculi were in right ureters, while 28 cases of 33 calculi were in left ureters and 10 cases of 27 calculi in both ureters. Conclusion Unenhanced 64-slice spiral CT combining ureter curved planar reformation can achieve whole ureters images with good imaging quality and display ureteral calculi accurately, it has great important value in clinical diagnosis and differential diagnosis of ureteral calculi.