Tominaga T, Shimizu H, Koshu K, Kayama T, Yoshimoto T
Department of Neurosurgery, Tohoku University School of Medicine, Sendai, Japan.
Neurosurgery. 1995 May;36(5):951-5. doi: 10.1227/00006123-199505000-00010.
Magnetic resonance imaging (MRI) of titanium anterior cervical plating systems and their effect on postoperative images were evaluated ex vivo and in vivo. The Synthes and Caspar plating systems were examined by 0.5- or 1.5-T MRI scanners. A phantom study of these implants showed that in spin-echo modes, the plates and screws were seen as areas of signal loss accompanying a marginal hyperintense band, which was more obvious in higher tesla magnetic fields. Distortion of the magnetic field was more prominent in T2-weighted images. In gradient echo mode, the plate and screws were seen as areas of signal loss larger than the size of the metal because of the magnetic susceptibility effect. Postoperative MRI produced images of the implants similar to those observed ex vivo. The Synthes plating system did not interfere with the evaluation of the spinal cord, and the Caspar screw (which penetrated the posterior cortex of the vertebral body) caused a small artifact to be present at the anterior aspect of the spinal cord. In addition to being able to provide fixation of the cervical spine, titanium anterior cervical plates allow superior MRI of the postoperative spine.
对钛制颈椎前路钢板系统进行了体外和体内磁共振成像（MRI）评估，以及它们对术后影像的影响。使用0.5-T或1.5-T MRI扫描仪对Synthes和Caspar钢板系统进行了检查。对这些植入物的模型研究表明，在自旋回波模式下，钢板和螺钉表现为信号丢失区域，并伴有边缘高信号带，在更高场强的磁场中更明显。在T2加权图像中，磁场畸变更显著。在梯度回波模式下，由于磁敏感性效应，钢板和螺钉表现为信号丢失区域，其大小大于金属本身。术后MRI产生的植入物影像与体外观察到的相似。Synthes钢板系统不干扰脊髓评估，而Caspar螺钉（穿透椎体后皮质）在脊髓前方产生小的伪影。除了能够提供颈椎固定外，钛制颈椎前路钢板还能使术后脊柱获得更好的MRI影像。
