非强化表观弥散系数值对梗阻早期肾脏的诊断价值

The diagnostic value of kidneys with early phase of obstruction in patients by analyzing apparent diffusion coefficient measurements without intravenous contrast material

目的研究非强化表观弥散系数值对由于尿路结石引起梗阻早期的患者的肾脏的诊断价值。方法筛选36例经静脉内尿路造影术诊断为肾盂肾盏扩张的患者作为研究对象。使用1.5 T超导MR进行单激发自旋回波、回波平面MR扩散成像,其扩散梯度b值分别为:50,400,800 s/mm2。测量正常侧和梗阻侧肾脏的感兴趣区域的肾实质表观弥散系数值。结果虽然患侧肾脏比正常侧肾脏表观弥散系数值较低,但是并没有显著的统计学差异。结论与正常侧肾脏相比较,梗阻侧肾脏的表观弥散系数值并没有显著的不同。

Objective： To evaluate the ability of apparent diffusion coefficient （ADC） measurements in early phase of obstruction due to urolithiasis. Methods ： Thirty - six patients with acute dilatation of the pelvicalyceal system detected by intravenous urography were included in this study. MR imaging was performed using a 1.5 T whole-body superconducting MR scanner. DW imaging was performed using single-shot spin - echo, echo-planar imaging （EPI） sequences with the following diffusion gradient b values： 50,400, 800s/mm^2. Circular region of imerest （ROI） was placed in the renal parenchyma for the measurement of ADC values in the normal and obstructed kidney. Results： The obstructed kidneys had the lower ADC values compared to normal kidneys, but these alterations were statistically insignicant. Conclusion： Signicantly different ADC values of early phase of obstructed kidneys are not observed compared to normal kidneys.