Department of Diagnostic Imaging and Nuclear Medicine, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto 606-8507, Japan.
Eur J Radiol. 2010 Jan;73(1):114-8. doi: 10.1016/j.ejrad.2008.08.003. Epub 2008 Oct 1.
The aim of this study was to evaluate image quality of 3D MR cholangiography (MRC) using high sampling efficiency technique (SPACE) at 3T compared with 1.5T.
An IRB approved prospective study was performed with 17 healthy volunteers using both 3 and 1.5T MR scanners. MRC images were obtained with free-breathing navigator-triggered 3D T2-weighted turbo spin-echo sequence with SPACE (TR, >2700ms; TE, 780ms at 3T and 801ms at 1.5T; echo-train length, 121; voxel size, 1.1mmx1.0mmx0.84mm). The common bile duct (CBD) to liver contrast-to-noise ratios (CNRs) were compared between 3 and 1.5T. A five-point scale was used to compare overall image quality and visualization of the third branches of bile duct (B2, B6, and B8). The depiction of cystic duct insertion and the highest order of bile duct visible were also compared. The results were compared using the Wilcoxon signed-ranks test.
CNR between the CBD and liver was significantly higher at 3T than 1.5T (p=0.0006). MRC at 3T showed a significantly higher overall image quality (p=0.0215) and clearer visualization of B2 (p=0.0183) and B6 (p=0.0106) than at 1.5T. In all analyses of duct visibility, 3T showed higher scores than 1.5T.
3T MRC using SPACE offered better image quality than 1.5T. SPACE technique facilitated high-resolution 3D MRC with excellent image quality at 3T.
本研究旨在评估使用高采样效率技术（SPACE）在 3T 与 1.5T 比较的情况下，3D MR 胆管成像（MRC）的图像质量。
本项经机构审查委员会批准的前瞻性研究纳入了 17 名健康志愿者，分别使用 3T 和 1.5T 磁共振扫描仪进行检查。使用自由呼吸导航触发的 3D T2 加权涡轮自旋回波序列（TR>2700ms；TE，3T 时为 780ms，1.5T 时为 801ms；回波链长度，121；体素大小，1.1mmx1.0mmx0.84mm）获取 MRC 图像。比较 3T 和 1.5T 之间胆总管（CBD）与肝脏的对比噪声比（CNR）。使用五分制评分标准比较总体图像质量和胆管第三分支（B2、B6 和 B8）的可视化程度。还比较了胆囊管插入的显示和可见胆管的最高级别。使用 Wilcoxon 符号秩检验比较结果。
CBD 与肝脏之间的 CNR 在 3T 时显著高于 1.5T（p=0.0006）。3T 时的 MRC 总体图像质量显著更高（p=0.0215），B2（p=0.0183）和 B6（p=0.0106）的可视化更清晰。在所有胆管可视性分析中，3T 的评分均高于 1.5T。
使用 SPACE 的 3T MRC 提供了比 1.5T 更好的图像质量。SPACE 技术在 3T 时实现了高分辨率 3D MRC，具有出色的图像质量。
