3.0T磁共振T2WI及重T2技术检测乳糜池的对比研究

Comparative detectability of cisterna chyli at 3.0 Tesla MR: fat-suppressed T2-weighted imaging versus heavily T2-weighted techniques

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。

Objective To detect the cisterna chyli on fat-suppressed T2-weighted images and heavily T2-weighted images and compare the advantages of two techniques. Methods Fat-suppressed T2-weighted images and three-dimensional MR lymphography （MRL） in 142 patients were performed. The location, configuration, small lymphatic channels, the meshwork of tiny lymphatic channels and the mean longitudinal, anteroposterior and transverse diameters of the cisterna chyli were compared in three methods including fat-suppressed T2-weighted images, consecutive raw images of the MRL and the maximum intensity projection （MIP） images. Results The cisterna chyli was shown in 94.37 % of patients on T2-weighted images, and 87.77% on MRL and the MIP images originally obtained by MRL. The cisterna chyli was located precisely using axial and coronal T2W1, 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, anteroposterior and transverse diameters were （26.3410.40） mm, （5.20±2.18） mm, and （5.25±2.16） mm, respectively. Conclusion Cisterna chyli can be located on fat-suppressed T2-weighted images, while its dimensions may be measured on MIP images or raw images of MRL using heavily T2-weighted technique. It will increase the detectability of cisterna chyli when combining the two methods together.