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在肌肉中植入永久磁铁的MRI安全考虑
Cameron R Taylor1,2, Eric D Anttila3, Steven J Charlebois3
1K. Lisa Yang Center for Bionics, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
Journal of magnetic resonance imaging : JMRI
|September 17, 2025
概括
永久磁铁植入物用于假肢控制在MRI中显示无迁移和最小的去磁化,长达1.5T. 这些发现表明,这些植入物患者可以安全地接受MRI扫描.
科学领域:
- 生物医学工程 生物医学工程
- 材料科学 材料科学 材料科学
- 放射学 放射学是一门学科.
背景情况:
- 永久磁体植入物用于各种医疗设备,包括耳植入物和假肢控制器.
- 由于与磁共振成像 (MRI) 的潜在相互作用,它们的使用需要谨慎使用.
- 之前的研究评估了磁铁稳定性和图像工件,但用于假肢的肌肉磁铁需要进一步评估MRI条件.
研究的目的:
- 评估植入肌肉的3毫米直径球形永久磁铁的位置和磁化稳定性.
- 在MRI条件下评估这些植入物产生的图像工件.
主要方法:
- 进行了一项前性纵向研究,使用猪模型在八个肌肉中植入磁铁.
- 组织学检查评估了植入物迁移和纤维性反应,并补充了CT成像用于二次分析.
- 基板研究量化了最坏的情况下的去磁化和MRI图像文物大小.
主要成果:
- 组织学分析显示,磁铁和对照点周围的纤维囊完好无损,表明没有显著的迁移.
- 在0.55-T和1.5-T的MRI暴露没有影响植入物迁移 (p>0.96).
- 在1.5-T时,最大的去磁化率为13.5%,图像工件延长至71mm.
结论:
- 研究的永久磁体植入物在0.55-T和1.5-TMRI下表现出对迁移的抗性和实质性的去磁化.
- 观察到可以忽略不计的图像工件,这表明这些植入物不禁用MRI,直到1.5T.
- 患有这些肌肉内永久磁体植入物的患者可能可以安全地接受MRI成像.
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