评估用于小耳畸形重建的不锈钢缝线的 MRI 安全性问题。
Assessment of MRI safety issues for stainless steel sutures used for microtia reconstruction.
机构信息
Department of Surgery, Division of Otolaryngology Head and Neck Surgery, University of New Mexico Health Sciences Center, 1 University of NM MSC 10 5610, Albuquerque, NM 87131, United States.
Department of Surgery, Division of Otolaryngology Head and Neck Surgery, University of New Mexico Health Sciences Center, 1 University of NM MSC 10 5610, Albuquerque, NM 87131, United States.
出版信息
J Plast Reconstr Aesthet Surg. 2018 Oct;71(10):1469-1475. doi: 10.1016/j.bjps.2018.05.050. Epub 2018 Jun 19.
INTRODUCTION
Potential magnetic resonance imaging issues for stainless steel sutures used for microtia reconstruction could be clinically significant for safety and diagnostic yield considerations. Therefore, the purpose of this investigation was to assess magnetic resonance issues (magnetic field interactions, heating, and artifacts) for different types of stainless steel sutures used for microtia reconstruction.
METHODS
Small gauge, commonly used stainless steel sutures from four different manufacturers (5/0 Steelex, Aesculap/B, Braun Medical, Inc.; Nagata 38 Gauge Microtia Wire, Bear Medical Corporation; Auricular Reco Wire, Medicon Surgical Inc.; and 5-0 B&S 35 Surgical Steel Suture, Ethicon, Inc.) were tested using standardized ex vivo techniques to assess magnetic field interactions, heating, and artifacts at 3 Tesla. Before testing, the stainless steel sutures were configured in a manner same as that for cartilage reconstruction used to treat microtia.
RESULTS
Each stainless steel suture exhibited minor magnetic field interactions at 3 Tesla (translational attraction, deflection angle <10°, and no torque). Heating associated with a whole-body averaged specific absorption rate of 2.9 W/kg was not excessive (highest temperature changes, ≤1.8 °C). Artifacts were relatively minor in relation to the size and shape of each stainless steel suture (artifact size in relation to the size and shape of each stainless steel suture extending ≤5 mm).
CONCLUSIONS
The stainless steel sutures that underwent testing do not present additional risks to patients in a 3-Tesla or less magnetic field setting (i.e., magnetic resonance conditional). Artifacts for these sutures may only be an issue within close proximity to the reconstructed ear.
简介
用于小耳畸形重建的不锈钢缝线在潜在磁共振成像方面可能存在安全和诊断效果方面的临床意义。因此，本研究旨在评估不同类型的不锈钢缝线在小耳畸形重建中使用时的磁共振问题（磁场相互作用、加热和伪影）。
方法
采用来自四个不同制造商的小规格常用不锈钢缝线（5/0 Steelex、Aesculap/B、Braun Medical, Inc.；Nagata 38 号微耳线，Bear Medical Corporation；Auricular Reco 线，Medicon Surgical Inc.；以及 5-0 B&S 35 号手术钢缝线，Ethicon, Inc.），使用标准化的离体技术进行测试，以评估 3 特斯拉下的磁场相互作用、加热和伪影。在测试之前，不锈钢缝线以与用于治疗小耳畸形的软骨重建相同的方式进行配置。
结果
每种不锈钢缝线在 3 特斯拉时都表现出轻微的磁场相互作用（平移吸引力、偏转角<10°，且无扭矩）。全身平均比吸收率为 2.9 W/kg 的加热并不过高（最高温度变化，≤1.8°C）。相对于每个不锈钢缝线的大小和形状，伪影相对较小（每个不锈钢缝线的伪影大小延伸不超过 5 毫米）。
结论
在 3 特斯拉或更低磁场环境下（即磁共振条件下），接受测试的不锈钢缝线不会对患者造成额外风险。这些缝线的伪影可能仅在靠近重建耳朵的近距离内才会成为问题。
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