摘要
目的探讨同一解剖位置不同检查者测量结果间的相关性及可复性。方法选取32例健康志愿者,其中男15例,女17例,年龄18～30岁,平均(25.4±3.4)岁。应用3.0TMR两次测量中脑导水管不同解剖位置的脑脊液(CSF)流动。由两位医师先后对同一志愿者进行独立扫描,所有图像由另一医师进行后处理。选用T2WI正中矢状面定位,先后垂直导水管入口段、中间段、出口段进行扫描。在导水管显示面积最大的幅度图像上沿其边缘绘制ROI,重复3次取其结果平均值。取收缩期向下峰值流速(PPV)、舒张期向上峰值流速(PNV)及绝对每搏出量(ASV)进行对比分析。取2位医师测量结果的平均数用于比较不同解剖定位对测量结果的影响。结果不同解剖定位间平均PPV、PNV存在统计学差异,上段高于下段(P<0.05),两两均数比较,入口段与出口段流速存在差异(P<0.05);而ASV三者间无差异(P>0.05)。不同医师测量相同解剖定位时,两次PPV测量结果相关性以中间段最高,相关系数r=0.94,出口段r=0.82,入口段r=0.78。结论①中脑导水管不同解剖位置的CSF流速存在差异,上段流速高于下段,而ASV无差异;②导水管中间段测量结果可复性最佳,可作为理想的测速位置。
Objective To explore the correlation and repeatability of the measured results on the same anatomical localization by different surveyor. Methods 32 healthy volunteers were selected for research, including 15 males and 17 female, aged 18- 30 yeas old, mean 25.4 ±3.4 yeas old. We measured CSF flow of the aqueduct with 3T MR on different anatom-ical localization repeatedly. All volunteers were examined by two physicians independently and all images were postpro cessed by another physician. The localizer was placed perpendicular to the inlet, ampulla, pars posterior of the aqueduct on the median sagittal T2-weighted image. The region of interest （ROD was drew in the amplitude image when the aqueduct could be seen optimally, the result was measured thrice and general average was calculated. Evaluated parameters were the peak positive velocity （PPV）, the peak negative velocity （PNV）, and the absolute stroke volume （ASV） were selected for comparative analysis. We took the average by the two physicians, and compared the influences of different anatomical localization. Results The PPV and PNV showed significant difference in different anatomical localization, the flow rates of upper segment were faster than the lower ones （ P 〉0.05）, but ASV showed no statistical difference （ P 〈0.05）, when compared each other, the flow rates of the inle were faster than the pars posterior of the aqueduct （ P 〈0.05）. As for the same anatomical position measured by different surveyor, the correlation of results showed most compacted on ampulla and the coefficient correlation r = 0.94, r =0.82 on the pars posterior, r = 0.78 on the inlet. Conclusion ①The flow rates showed significant difference in different anatomical localization, the upper segments were faster than the lower ones （ P d0.05）, ASV showed no statistical difference （ P 〉0.05） ②The metered results of ampulla showed the best repeat ability, the ampulla of cerebral aqueduct could become the desirable anatomical localization of PC-MR measurement.
出处
《医学影像学杂志》
2013年第3期355-358,共4页
Journal of Medical Imaging
