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在没有射频屏蔽的情况下设计和操作全身MRI扫描仪
Stephan Biber1, Stephan Kannengiesser1, Juergen Nistler1
1Siemens Healthineers AG, Erlangen, Germany.
Magnetic resonance in medicine
|November 12, 2024
概括
这项研究表明,0.55T的MRI扫描仪可以在没有射频的情况下运行,有效地使用辅助天线和信号处理来消除干扰工件. 实现电磁兼容性是可能的,尽管潜在的硬件密集型.
科学领域:
- 医疗成像医学成像
- 电磁学 电磁学 电磁学 电磁学
- 信号处理 信号处理
背景情况:
- 传统的磁共振成像 (MRI) 系统需要无线电频率 (RF) 屏蔽房间 (RF),以防止外部电磁干扰.
- 在没有射频屏蔽的情况下操作MRI扫描仪在维护图像质量和实现电磁兼容性 (EMC) 方面存在挑战.
研究的目的:
- 为了评估在没有射频室的情况下运行临床MRI系统的可行性.
- 评估信号处理对干扰取消和主动发射辐射抑制的有效性.
- 为了减轻图像工件,并在未屏蔽的MRI环境中实现EMC.
主要方法:
- 一个0.55T的临床全身MRI扫描仪在没有屏蔽的环境中运行.
- 使用16个辅助接收天线的射频侧环取消算法来消除MR信号的干扰.
- 在环境和人工射频噪声条件下进行了各种MR序列的体内测量.
- 进行模拟以评估使用不同辅助发射天线配置的发射EMC.
主要成果:
- 侧叶取消算法有效地删除了干扰器件,保留了所需的MR信号.
- 模拟表明,使用32个或更多的辅助发射天线可以实现电磁合规.
- 传感器点的数量和位置被确定为性能关键因素.
结论:
- 一个0.55TMRI扫描仪可以在没有射频屏蔽的情况下运行,并成功删除外部干扰器件.
- 主动取消传输显示了实现电磁合规的潜力,尽管实际的硬件实施可能具有挑战性.
- 适度数量的辅助天线足以有效消除干扰.
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