Yoshioka Hiroshi, Ueno Teruko, Tanaka Toshikazu, Shindo Masashi, Itai Yuji
Department of Radiology, University of Tsukuba, Tsukuba, Japan.
Skeletal Radiol. 2003 Oct;32(10):575-81. doi: 10.1007/s00256-003-0672-7. Epub 2003 Aug 27.
To compare MR images of the triangular fibrocartilage complex (TFCC) using microscopy coils with those using a conventional surface coil qualitatively and quantitatively.
Proton density-weighted images and T2*-weighted images of the TFCC from ten normal volunteers were obtained with a conventional surface coil (C4 coil; 80 mm in diameter), a 47-mm microscopy surface coil and a 23-mm microscopy surface coil) at 1.5 T. Qualitative image analysis of MR images with three coils was performed by two radiologists who assigned one of five numerical scores (0, nonvisualization; 1, poor; 2, average; 3, good; 4, excellent) for five TFCC components, which were disc proper, triangular ligament, meniscus homologue, ulnotriquetral and ulnolunate ligament. Quantitative analysis included the signal-to-noise ratio (S/N) of the disc proper of TFCC, the lunate cartilage, the lunate bone and the contrast-noise-ratio (C/N) between articular cartilage and disc proper or bone marrow were measured.
All structures show higher scores qualitatively on MR with microscopy coils than those with a C4 coil, and the difference was significant with the exception of the ulnolunate ligament. MR with microscopy coils showed significantly higher S/N values than those with a conventional surface coil (P<0.05 to P<0.001). T2*-weighted images using microscopy coils showed significantly higher cartilage-disc proper C/N and cartilage-bone marrow C/N (P<0.01 to P<0.001). On proton density-weighted images, the C/N between cartilage and disc proper with two microscopy coils was significantly higher (P<0.01) than that with a conventional coil.
High-resolution MR images of the normal wrist using microscopy coils were superior to those using a conventional surface coil qualitatively and quantitatively. High-resolution MR imaging with a microscopy coil would be a promising method to diagnose TFCC lesions.
定性和定量比较使用显微镜线圈与传统表面线圈获取的三角纤维软骨复合体（TFCC）的磁共振图像。
对10名正常志愿者的TFCC进行质子密度加权成像和T2*加权成像，分别使用传统表面线圈（C4线圈；直径80mm）、47mm显微镜表面线圈和23mm显微镜表面线圈，磁场强度为1.5T。由两名放射科医生对三种线圈的磁共振图像进行定性分析，针对TFCC的五个组成部分（即盘状本体、三角韧带、半月板同源物、尺三角韧带和尺月韧带）给出五个数值评分之一（0分，未显示；1分，差；2分，一般；3分，好；4分，优）。定量分析包括测量TFCC盘状本体、月骨软骨、月骨以及关节软骨与盘状本体或骨髓之间的对比噪声比（C/N）的信噪比（S/N）。
在磁共振成像中，所有结构使用显微镜线圈时的定性评分均高于使用C4线圈时，除尺月韧带外差异均有统计学意义。使用显微镜线圈的磁共振成像显示的S/N值显著高于传统表面线圈（P<0.05至P<0.001）。使用显微镜线圈的T2*加权成像显示软骨 - 盘状本体C/N和软骨 - 骨髓C/N显著更高（P<0.01至P<0.001）。在质子密度加权成像中，两个显微镜线圈的软骨与盘状本体之间的C/N显著高于传统线圈（P<0.01）。
使用显微镜线圈获取的正常腕关节高分辨率磁共振图像在定性和定量方面均优于传统表面线圈。使用显微镜线圈进行高分辨率磁共振成像将是诊断TFCC损伤的一种有前景方法。
