颈椎外部固定装置：3.0T 磁共振成像问题评估。
Cervical external immobilization devices: evaluation of magnetic resonance imaging issues at 3.0 Tesla.
机构信息
RadNet Management, Inc., Los Angeles, CA, USA.
出版信息
Spine (Phila Pa 1976). 2010 Feb 15;35(4):411-5. doi: 10.1097/BRS.0b013e3181b0e9f8.
STUDY DESIGN
Laboratory investigation, ex vivo.
OBJECTIVE
Currently, no studies have addressed the magnetic resonance imaging (MRI) issues for cervical external immobilization devices at 3-Tesla. Under certain conditions significant heating may occur, resulting in patient burns. Furthermore, artifacts can be substantial and prevent the diagnostic use of MRI. Therefore, the objective of this investigation was to evaluate MRI issues for 4 different cervical external immobilization devices at 3-Tesla.
SUMMARY OF BACKGROUND DATA
Excessive heating and substantial artifacts are 2 potential complications associated with performing MRI at 3-Tesla in patients with cervical external immobilization devices. Using ex vivo testing techniques, MRI-related heating and artifacts were evaluated for 4 different cervical devices during MRI at 3-Tesla.
METHODS
Four cervical external immobilization devices (Generation 80, Resolve Ring and Superstructure, Resolve Ring and Jerome Vest/Jerome Superstructure, and the V1 Halo System; Ossur Americas, Aliso Viejo, CA) underwent MRI testing at 3-Tesla. All devices were made from nonmetallic or nonmagnetic materials. Heating was determined using a gelled-saline-filled skull phantom with fluoroptic thermometry probes attached to the skull pins. MRI was performed at 3-Tesla, using a high level of RF energy. Artifacts were assessed at 3-Tesla, using standard cervical imaging techniques.
RESULTS
The Generation 80 and V1 Halo devices exhibited substantial temperature rises (11.6 degrees C and 8.5 degrees C, respectively), with "sparking" evident for the Generation 80 during the MRI procedure. Artifacts were problematic for these devices, as well. By comparison, the 2 Resolve Ring-based cervical external immobilization devices showed little or no heating (< or = 0.6 degrees C) and the artifacts were acceptable for diagnostic MRI examinations.
CONCLUSION
The low degree of heating and minor artifacts associated with the Resolve-based cervical external immobilization devices indicated that these products are safe for patients undergoing MRI at 3-Tesla.
研究设计
实验室研究，离体研究。
目的
目前，尚无研究涉及 3T 磁共振成像（MRI）下颈椎外固定装置的问题。在某些情况下，可能会发生显著的加热，导致患者灼伤。此外，伪影可能会很大，从而阻止 MRI 的诊断使用。因此，本研究的目的是评估 4 种不同的颈椎外固定装置在 3T 下的 MRI 问题。
背景资料总结
在有颈椎外固定装置的患者中，在 3T 下进行 MRI 会导致过度加热和大量伪影这两种潜在并发症。本研究使用离体测试技术，在 3T 下对 4 种不同的颈椎设备进行 MRI 相关加热和伪影评估。
方法
对 4 种颈椎外固定装置（第 80 代、Resolve 环和 Superstructure、Resolve 环和 Jerome Vest/Jerome Superstructure 以及 V1 Halo 系统；Ossur Americas，Aliso Viejo，CA）进行了 3T 的 MRI 测试。所有设备均由非金属或非磁性材料制成。通过将附着在颅骨销上的荧光光纤温度探头的凝胶盐水填充颅骨模型来确定加热情况。在 3T 下使用高水平的射频能量进行 MRI，使用标准的颈椎成像技术评估伪影。
结果
第 80 代和 V1 Halo 装置的温度升高明显（分别为 11.6°C 和 8.5°C），在 MRI 过程中第 80 代出现了“火花”。这些设备的伪影问题也很严重。相比之下，2 种基于 Resolve 环的颈椎外固定装置加热程度较低（<或=0.6°C），并且伪影可用于诊断性 MRI 检查。
结论
基于 Resolve 的颈椎外固定装置引起的低程度加热和轻微伪影表明，这些产品在 3T 下进行 MRI 时对患者是安全的。
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