Ortiz O, Pait T G, McAllister P, Sauter K
Department of Radiology, Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, USA.
Neurosurgery. 1996 Apr;38(4):741-5.
Within recent years, the technologies of radiological imaging and spinal instrumentation have exponentially increased. New methods of preoperative imaging, that is, magnetic resonance imaging (MRI) and computed tomography, have allowed for a better understanding of surgical pathology. Such an understanding is likely to lead to a more successful surgical experience, which certainly is the case with spine surgery with instrumentation. However, after implantation of most instrumentation, imaging is greatly impaired. Metallurgic advancements in titanium were sought to reduce postoperative imaging problems. The purpose of this study is to assess the presence and extent of artifacts seen on postoperative MRI scans in patients with titanium spinal implants. Six patients, four with degenerative spine disease and two with neoplasms, had thoracic and/or lumbar spinal fixation performed with titanium instrumentation. All patients underwent postoperative conventional MRI with the use of T1-weighted, T2-weighted, and gradient-echo sequences. The scans and individual sequences were then analyzed for image quality. A progressive and significant increase in imaging artifact related to the titanium spinal instrumentation was observed on the T1-weighted, T2-weighted, and gradient-echo sequences. Titanium spinal instruments do not allow optimal postoperative imaging on conventional MRI scanners.
近年来，放射成像技术和脊柱内固定技术呈指数级增长。术前成像的新方法，即磁共振成像（MRI）和计算机断层扫描，有助于更好地了解手术病理情况。这种了解可能会带来更成功的手术体验，脊柱内固定手术无疑就是这种情况。然而，在植入大多数内固定装置后，成像会受到极大影响。人们致力于钛金属的冶金技术进步以减少术后成像问题。本研究的目的是评估钛制脊柱植入物患者术后MRI扫描中伪影的存在情况和范围。6例患者，4例患有退行性脊柱疾病，2例患有肿瘤，接受了钛制器械的胸椎和/或腰椎脊柱固定手术。所有患者术后均使用T1加权、T2加权和梯度回波序列进行常规MRI检查。然后对扫描图像和各个序列进行图像质量分析。在T1加权、T2加权和梯度回波序列上观察到与钛制脊柱器械相关的成像伪影有逐渐且显著的增加。钛制脊柱器械在传统MRI扫描仪上无法实现最佳的术后成像。
