3.0T磁共振T2WI及重T2技术检测乳糜池的对比研究

目的利用3.0T磁共振脂肪抑制T2WI及重T2技术对乳糜池进行成像,探讨两种技术的优劣性。方法对142例病人进行上腹部脂肪抑制T2WI及三维MR乳糜池成像,观察两种手段显示的乳糜池的形态、位置以及汇入的小淋巴管和网状小淋巴管等情况,并根据冠状T2WI、MR乳糜池成像的原始图像及MIP图像对乳糜池的各个径线进行测量。结果乳糜池在脂肪抑制T2WI图像显示为134例(94.37%),在三维MR乳糜池成像原始图像和MIP图像显示113例(87.77%)。轴位、冠状脂肪抑制T2WI图像结合三平面定位图像可以对乳糜池的位置进行定位,大多数乳糜池位于第一腰椎水平,并位于椎体中央的前方。乳糜池变异较大,多数为管状和梭形,MIP图像上平均的上下径、左右径和前后径分别为(26.34±10.40)mm、(5.20±2.18)mm和(5.25±2.16)mm。结论脂肪抑制T2WI可用于乳糜池的定位,重T2加权技术可以对乳糜池进行准确测量,结合两种技术可提高乳糜池研究的准确性。

Comparative detectability of cisterna chyli at 3. 0 Tesla MR: fat-suppressed T22weighted imaging versus heavily T22weighted techniques

Objective To detect the cisterna chyli on fat-suppressed T2-weighted images and heavily T2-weighted imagesand compare the advantages of two techniques. Methods Fat2suppressed T2-weighted images and three-dimensional MRlymphography (MRL) in 142 patient s were performed. The location, configuration , small lymphatic channels , the mesh-work of tiny lymphatic channels and the mean longitudinal, anteroposterior and t ransverse diameters of the cisterna chyliwere compared in three methods including fat-suppressed T22weighted images , consecutive raw images of the MRL and themaximum intensity projection (MIP) images. Results The cisterna chyli was shown in 94. 37 % of patient s on T22weightedimages , and 87.77% on MRL and the MIP images originally obtained by MRL. The cisterna chyli was located preciselyusing axial and coronal T2WI , and most location was at the level of L1, and anterior to the midline of the vertebral body.The most common configuration was tubular and saccular (61.95 %) on MIP, and the mean longitudinal , anteroposteriorand t ransverse diameters were (26. 34 ±10.40)mm, (5.20 ±2.18) mm,and (5.25 ±2.16) mm, respectively. Conclusion Cisterna chyli can be located on fat2suppressed T22weighted images , while it s dimensions may be measured on MIP images orraw images of MRL using heavily T2-weighted technique. It will increase the detectability of cisterna chyli when combiningthe two methods together.