Imaeda T, Nakamura R, Miura T, Makino N
Department of Orthopaedic Surgery, Nagoya University School of Medicine, Japan.
J Hand Surg Br. 1992 Feb;17(1):20-7. doi: 10.1016/0266-7681(92)90007-o.
The use of a 1.5 tesla superconducting M.R. imager and surface coil was found to enhance the ability of M.R.I. to depict the fine anatomy of the wrist. Five healthy volunteers and 28 patients with scaphoid fractures underwent M.R.I., which made possible a definitive diagnosis of scaphoid fractures at an early stage. A fresh fracture was identified by decreased or iso signal intensity on the T1-weighted image and increased signal intensity on the T2-weighted image. This increase continued until bony union was apparent on radiographs. On the T2-weighted image, high signal intensity was characteristic of fresh fractures and suggested that bony union was possible. When bony union was complete, the intensity of the signal for the scaphoid on both T1- and T2-weighted images returned to normal. M.R.I. should thus prove useful in the diagnosis of scaphoid fractures.
研究发现，使用1.5特斯拉超导磁共振成像仪和表面线圈可增强磁共振成像描绘腕部精细解剖结构的能力。5名健康志愿者和28名舟骨骨折患者接受了磁共振成像检查，这使得在早期就能对舟骨骨折做出明确诊断。新鲜骨折在T1加权图像上表现为信号强度降低或等信号，在T2加权图像上表现为信号强度增加。这种信号增强会持续到X线片上显示出骨愈合。在T2加权图像上，高信号强度是新鲜骨折的特征，提示可能会发生骨愈合。当骨愈合完成时，舟骨在T1加权和T2加权图像上的信号强度均恢复正常。因此，磁共振成像在舟骨骨折的诊断中应会被证明是有用的。
