Ernstberger Thorsten, Buchhorn Gottfried, Baums Mike Herbert, Heidrich Gabert
Department of Orthopaedic Surgery, University of Göttingen, Germany.
Acta Orthop Belg. 2007 Apr;73(2):244-9.
The purpose of this study was to investigate how different materials affect the magnetic resonance imaging (MRI) detectability of interbody test spacers (ITS). We evaluated the post-implantation MRI scans with T1 TSE sequences for three different ITS made of titanium, carbon fibre-reinforced polymers (CFRP) and titanium-coated CFRP, respectively. The main target variables were total artefact volume (TAV) and median artefact area (MAA). Additionally, implant volume (IV)/TAV and cross section (CS)/MAA ratio were determined. The t test and Newman-Keuls test for multiple comparisons were used for statistical analysis. TAV and MAA did not differ significantly between CFRP and titanium-coated CFRP, but were approximately twice as high for the titanium ITS (p < 0.001). MRI detectability was optimum for CFRP and titanium-coated CFRP, but was limited at the implant-bone interface of the titanium ITS. The material's susceptibility and the implant's dimensions affected MRI artefacting. Based on TAV, the volume of titanium surface coating in the ITS studied has no influence on susceptibility in MRI scans with T1 TSE sequences.
本研究的目的是调查不同材料如何影响椎间融合试验间隔器（ITS）的磁共振成像（MRI）可检测性。我们分别使用T1 TSE序列对由钛、碳纤维增强聚合物（CFRP）和钛涂层CFRP制成的三种不同ITS进行植入后MRI扫描评估。主要目标变量为总伪影体积（TAV）和伪影面积中位数（MAA）。此外，还确定了植入物体积（IV）/TAV和横截面积（CS）/MAA比值。采用t检验和用于多重比较的纽曼-基尔斯检验进行统计分析。CFRP和钛涂层CFRP之间的TAV和MAA无显著差异，但钛制ITS的TAV和MAA约为前两者的两倍（p < 0.001）。CFRP和钛涂层CFRP的MRI可检测性最佳，但钛制ITS在植入物与骨界面处的可检测性受限。材料的磁化率和植入物尺寸影响MRI伪影。基于TAV，在所研究的ITS中钛表面涂层的体积对T1 TSE序列MRI扫描中的磁化率无影响。
