在婴儿幻影上对8通道并行传输双极阵列的模拟验证:包括RF损失以与实验结果有稳健的相关性
Jérémie Daniel Clément1,2, Özlem Ipek2
1System Technologies, Siemens Healthineers AG, 91052 Erlangen, Germany.
Sensors (Basel, Switzerland)
|April 13, 2024
概括
本研究通过包括射频损失来验证平行传输 (pTx) 阵列的模拟模型. 在7T时对pTx阵列的精确模拟可以降低安全边际.
科学领域:
- 磁共振成像技术 磁共振成像技术
- 电磁学 电磁学 电磁学 电磁学
- 生物医学工程 生物医学工程
背景情况:
- 平行传输 (pTx) 技术提高了MRI的性能.
- 由于性能不确定性,当前的pTx阵列模拟具有限制性的安全边际.
- 需要精确的模拟到制造相关性来优化pTx系统.
研究的目的:
- 为了验证一个模拟模型的8通道双极平行传输 (pTx) 阵列在7特斯拉 (7T).
- 评估将射频 (RF) 损失纳入模拟模型的影响.
- 将模拟的性能指标与实验测量进行比较.
主要方法:
- 开发了一个包括RF损失的模拟模型,用于8通道双极pTx阵列.
- 将模拟的S矩阵 (反射和合系数) 与实验数据进行比较.
- 经过验证的模拟单个B1+场地图与实验测量使用规范化根-平方平均误差 (NRMSE) 的实验测量.
主要成果:
- 包括射频损失的RF模型实现了反射系数的平均相对差异为~1.1%和~4.2%的第1合项.
- 对于第二个合项,观察到约9.4%的平均相对差异.
- 对于B1+现场地图比较,获得了4.8%的最大NRMSE,证明了高精度.
结论:
- 拟议的模拟模型准确地预测了平行传输 (pTx) 阵列在7T的性能.
- 纳入射频损失显著改善了模拟和实验数据之间的相关性.
- 这种经过验证的模型可以帮助减少pTx系统的安全差距,从而改善临床应用.
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