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限制性SAR协议:一种以无条件安全的方式评估MRI线圈原型的方法
Natalia Dudysheva1,2, Franck Mauconduit1, Redha Abdeddaim3
1Paris-Saclay University, CEA, CNRS, BAOBAB, NeuroSpin, Gif-sur-Yvette, France.
Magnetic resonance in medicine
|December 12, 2023
概括
一个新的受限制的特定吸收率 (SAR) 协议允许对射频 (RF) 线圈原型进行安全和高效的体内测试. 这种方法通过绕过复杂的电磁模拟和幻影验证来加速临床翻译.
科学领域:
- 医疗成像医学成像
- 生物医学工程 生物医学工程
- 无线电频率工程 无线电频率工程
背景情况:
- 测试射频 (RF) 线圈原型需要广泛的安全验证,包括电磁模拟和幻影验证,以预测特定吸收率 (SAR).
- 目前的安全程序是繁重和耗时的,阻碍了定制线圈系统从原型到临床应用的快速过渡.
研究的目的:
- 为了简化和更安全的线圈设计验证过程,引入一个受限制的特定吸收率 (rS) 模式.
- 为了使代表性的第一个实验 in vivo,加速定制射频线圈系统的临床翻译.
主要方法:
- 限制SAR (rS) 模式基于最坏的吸收场景,独立于空间SAR分布,为无条件的安全性施加功率限制.
- 一个开发的rS协议包括用于卷轴评估的序列,满足rS条件,并提供定量传输/接收配置文件和定性图像评估.
- 协议验证是在使用健康志愿者进行的商业和原型线圈上进行的.
主要成果:
- 通过rS协议,可在临床上兼容的获取时间内 (不到17分钟) 进行线圈评估.
- 在协议执行期间,全球SAR水平仍然明显低于安全限值 (比IEC限值低100倍).
- 该协议成功地描述了线圈性能和图像质量.
结论:
- rS协议提供了一种无条件安全的方法,用于直接在志愿者身上描述和比较RF线圈原型.
- 这种方法消除了对广泛的电磁计算和幻影验证的需求,简化了线圈开发过程.
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