Role of magnetic resonance imaging in the evaluation of the hydroxyapatite orbital implant.
Role of magnetic resonance imaging in the evaluation of the hydroxyapatite orbital implant.
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DOI：
10.1016/s0161-6420(92)31918-9
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发表时间：
1992-05
期刊：
影响因子：
13.7
通讯作者：
P. Potter;C. L. Shields;Jerry A. Shields;A. E. Flanders;Vijay M. Rao
中科院分区：
文献类型：
--
作者：
P. Potter;C. L. Shields;Jerry A. Shields;A. E. Flanders;Vijay M. Rao
磁共振成像（MRI）的作用，在评估纤维血管向内生长的综合羟基磷灰石义眼台进行了评价。15例接受眼球摘除术和羟基磷灰石义眼座植入术的患者在植入物钻孔前，使用表面线圈进行钆-DPTA增强MRI，评价植入物血管分布程度。在T1加权像上，羟基磷灰石球呈中等信号。钆-DPTA给药后，所有患者的植入物均显示增强，与纤维血管向内生长的存在一致。增强在球体的周边部分最明显，并且早在植入后5个月就观察到。对比对比增强计算机断层扫描，超声检查和彩色多普勒成像的钆DPTA增强MRI表明，后者的技术是没有帮助的检测纤维血管组织的眼眶植入物。骨扫描，一种被许多外科医生使用的技术，显示了纤维血管向内生长，但它受到其一维低分辨率图像的限制。由于其三维能力和最高分辨率，表面线圈的对比增强MRI似乎是评价羟基磷灰石眼眶植入物及其纤维血管向内生长的最佳成像方法。
The role of magnetic resonance imaging (MRI) in the assessment of fibrovascular ingrowth in the integrated hydroxyapatite orbital implant is evaluated. Fifteen patients who underwent enucleation and placement of a hydroxyapatite orbital implant were evaluated for degree of implant vascularity with gadolinium-DPTA-enhanced MRI with surface coil before drilling the implant. On T1-weighted images, the hydroxyapatite sphere appeared with intermediate signal. After gadolinium-DPTA administration, all patients showed an enhancement in the implant consistent with the presence of fibrovascular ingrowth. The enhancement was most notable in the peripheral portions of the sphere and was seen as early as 5 months after implantation. Comparison of gadolinium-DPTA-enhanced MRI with contrast-enhanced computed tomography, ultrasonography, and color Doppler imaging suggests that these latter techniques are not as helpful in the detection of the fibrovascular tissue in the orbital implant. Bone scan, a technique used by many surgeons, demonstrates fibrovascular ingrowth, but it is limited by its one-dimensional low-resolution image. Because of its three-dimensional capability and its highest resolution, contrast-enhanced MRI with surface coil appears to be the best imaging method for evaluating the hydroxyapatite orbital implant and its fibrovascular ingrowth.