高动态范围的映射用于评估并行发射阵列的平行发射阵列
Jörg Felder1,2, Markus Zimmermann1, N Jon Shah1,3,4,5
1Institute of Neuroscience and Medicine - 4, Forschungszentrum Jülich, Jülich, Germany.
Magnetic resonance in medicine
|October 27, 2024
概括
本研究提出了一种创新方法,用于生成高信号噪声比 (SNR) 定量磁共振成像 (qMRI) 参数图,使用梯度回声和实际翻转角度测量. 这种技术特别有利于开发并行传输阵列.
科学领域:
- 磁共振成像 (MRI) 是一种磁共振成像技术.
- 定量成像技术 定量成像技术
- 医学物理 医学物理
背景情况:
- 准确获取定量磁共振成像 (qMRI) 参数图对于各种临床和研究应用至关重要.
- 现有的生成这些地图的方法可以通过信号噪声比 (SNR) 和动态范围来限制,特别是在开发先进的MRI硬件 (如并行传输阵列) 的过程中.
研究的目的:
- 展示一个高动态范围和高SNR的方法来获取绝对地图.
- 开发一种在平行传输阵列的构建和校准过程中特别有用的技术.
主要方法:
- 利用通过单个通道激发获得的低翻转角梯度回声图像来计算相对地图.
- 采用ESPIRiT (Ésperit) 平行图像重建方法,用于在地图计算中增强SNR.
- 通过校准生成绝对地图,使用同步多通道传输进行单个实际翻转角度采集.
主要成果:
- 在获取的地图的SNR中取得了中等到高的收益.
- SNR的改进取决于接收通道的数量和接收元件的空间定位.
结论:
- 拟议的方法非常适合在收发机阵列建设过程中获取地图.
- 与传统方法相比,在没有额外测量的情况下提供更高的SNR地图.
- 由于优化的开源ESPIRiT实现 (例如,BART工具箱),可以轻松采用和快速估计接收通道.
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