Sullivan P K, Smith J F, Rozzelle A A
Division of Plastic Surgery, Brown University School of Medicine, Providence, R.I.
Plast Reconstr Surg. 1994 Oct;94(5):589-96.
A study was undertaken to evaluate the safety of magnetic resonance imaging (MRI) of metallic implants used in cranio-orbital reconstruction (stainless steel wire and titanium and Vitallium plates) and also to compare the degree of artifact created on computed tomographic (CT) scanning and MRI by each material. Samples of each material were tested for deflection (movement) in a 1.5-T MRI field and for temperature change under conditions simulating a clinical MRI scan. None of the materials exhibited any deflection, and none exhibited any significant temperature change compared with water. Standardized bars of each material and commonly used, commercially available titanium and Vitallium implants (plates, mesh) were evaluated for artifact. On blinded evaluation by three radiologists and on quantitative computer analysis of the CT images, the stainless steel produced the most artifact on both CT scan and MRI, followed by the Vitallium, with the least artifact caused by titanium. All the titanium images were felt to be acceptable to detect orbital pathology, while only the images with the thinnest Vitallium (micromesh) implant were acceptable.
开展了一项研究，以评估用于颅眶重建的金属植入物（不锈钢丝、钛板和维他灵板）进行磁共振成像（MRI）的安全性，并比较每种材料在计算机断层扫描（CT）和MRI上产生的伪影程度。对每种材料的样本进行了测试，以检测其在1.5-T MRI场中的偏转（移动）情况以及在模拟临床MRI扫描的条件下的温度变化。与水相比，没有一种材料出现任何偏转，也没有出现任何显著的温度变化。对每种材料的标准棒以及常用的市售钛和维他灵植入物（板、网）进行了伪影评估。在三位放射科医生的盲法评估以及对CT图像的定量计算机分析中，不锈钢在CT扫描和MRI上产生的伪影最多，其次是维他灵，钛产生的伪影最少。所有钛制图像被认为可用于检测眼眶病变，而只有最薄的维他灵（微网）植入物的图像是可接受的。
