Metal artifact reduction sequence: Early clinical applications
Metal artifact reduction sequence: Early clinical applications
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DOI：
10.1148/radiographics.20.3.g00ma10699
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发表时间：
2000-05-01
期刊：
影响因子：
5.5
通讯作者：
Masri, B
中科院分区：
文献类型：
--
作者：
Olsen, RV;Munk, PL;Masri, B
由金属硬件引起的磨损仍然是骨科磁共振成像中的一个重要问题。金属伪影减少序列（MARS）可减少磁场失真引起的磁化率伪影的大小和强度。该序列基于视角倾斜并结合增加的梯度强度，可以方便地与任何自旋回波序列结合使用，并且不需要额外的成像时间。在股骨颈骨折后持续疼痛的患者中，MARS技术可以显示髋关节螺钉附近的骨髓，从而能够诊断或排除缺血性坏死。髋关节中的其他应用包括髋关节置换术后假体周围软组织的评估、骨肿瘤切除和重建后的术后评估以及髋关节置换术翻修手术前未混浊的甲基丙烯酸甲酯骨水泥的定位。在膝关节中，MARS技术允许可视化植入的金属斯台普斯、骨针或螺钉附近的结构。该技术可以显着改善假体周围骨和软组织结构的可视化，即使是在接受全膝关节置换术的患者中。在使用脊柱内固定器械的患者中，MARS技术通常允许可视化椎体和椎管内容物。该技术可用于腕关节融合或舟骨骨折螺钉固定后。
Artifact arising from metal hardware remains a significant problem in orthopedic magnetic resonance imaging. The metal artifact reduction sequence (MARS) reduces the size and intensity of susceptibility artifacts from magnetic field distortion. The sequence, which is based on view angle tilting in combination with increased gradient strength, can be conveniently used in conjunction with any spin-echo sequence and requires no additional imaging time. In patients with persistent pain after femoral neck fracture, the MARS technique allows visualization of marrow adjacent to hip screws, thus enabling diagnosis or exclusion of avascular necrosis. Other applications in the hip include assessment of periprosthetic soft tissues after hip joint replacement surgery, postoperative assessment after resection of bone tumors and reconstruction, and localization of unopacified methyl methacrylate cement prior to hip arthroplasty revision surgery. In the knee, the MARS technique allows visualization of structures adjacent to implanted metal staples, pins, or screws. The technique can significantly improve visualization of periprosthetic bone and soft-tissue structures even in patients who have undergone total knee arthroplasty. In patients with spinal fixation hardware, the MARS technique frequently allows visualization of the vertebral bodies and spinal canal contents. The technique can be helpful after wrist fusion or screw fixation of scaphoid fractures.