Department of Otolaryngology at UKB, Hospital of University of Berlin, Charité Medical School, Berlin, Germany.
Otol Neurotol. 2011 Sep;32(7):1040-6. doi: 10.1097/MAO.0b013e31822a9816.
To review the current knowledge on magnetic resonance imaging (MRI) safety of the Vibrant Soundbridge (VSB) system, an implantable, active middle ear implant.
National Library of Medicine's online database and clinical reports.
All available articles from 1995 to 2010 on MRI compatibility of the VSB and other active middle ear implants.
Minor demagnetization was found for alignments of the magnets antiparallel to the magnetic field of the scanner, which played no clinically important role. In some cases, the torque forces upon MRI scanning can lead to pain and/or dislocation of the implant or dislocation of the floating mass transducer (FMT) depending on its type of positioning and attachment in the middle ear. Consecutive need of revision surgery is possible. Voltage induction may cause loud audible sounds; however, there were no reports for cochlear hearing loss. No significant heating effects upon MRI scanning were reported. Image artifacts occur especially because of the large magnet. In none of the patient or temporal bone studies, the ossicles, round or oval window, or other middle ear structures were injured, and there was no functional loss of the implant performance (i.e., demagnetization of the FMT).
MRI examinations of up to 1.5T may be of crucial diagnostic importance to the patients implanted with a VSB, but there seems no serious risk of harm to the patient or damage to the VSB. A dislocation of the FMT can be possible during MRI, and this does depend on transducer position and the security of the transducer to the vibratory structure and the coupling mode used. The next generation of VSB systems should consider those possible changes in its design.
回顾关于可植入主动中耳植入物 Vibrant Soundbridge（VSB）系统的磁共振成像（MRI）安全性的现有知识。
美国国家医学图书馆在线数据库和临床报告。
1995 年至 2010 年关于 VSB 和其他主动中耳植入物与 MRI 兼容性的所有可用文章。
发现磁铁与扫描仪磁场平行排列时会发生轻微退磁，但在临床上没有重要作用。在某些情况下，MRI 扫描时的扭矩力可能导致植入物疼痛和/或脱位，或者取决于其在中耳中的定位和固定方式，浮动质量换能器（FMT）脱位。可能需要连续进行修正手术。电压感应可能会导致响亮的可听声音；但是，没有关于耳蜗听力损失的报告。MRI 扫描时没有报道明显的加热效应。图像伪影尤其会因为大磁铁而发生。在患者或颞骨研究中，没有报道听小骨、卵圆窗或其他中耳结构受伤，并且植入物性能（即 FMT 退磁）没有丧失功能。
对于植入 VSB 的患者，1.5T 以下的 MRI 检查可能对诊断至关重要，但似乎对患者或 VSB 没有严重的伤害风险。在 MRI 期间可能会发生 FMT 脱位，这取决于换能器的位置以及换能器对振动结构的安全性和使用的耦合模式。下一代 VSB 系统应考虑在其设计中进行这些可能的更改。
