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加快的2D卡尔特斯核磁共振 (MRI) 使用8通道的局部B0线圈阵列与并行成像相结合
Rui Tian1, Martin Uecker2,3,4,5, Mathias Davids6,7
1High-Field MR center, Max Planck Institute for Biological Cybernetics, Tübingen, Germany.
Magnetic resonance in medicine
|October 23, 2023
概括
这项研究优化了使用局部线圈阵列在磁共振成像 (MRI) 中的磁场调制. 这种新方法显著加快了二维卡尔特斯扫描的速度,实现了三倍和八倍的加速度,没有可见的工件.
科学领域:
- 磁共振成像 (MRI) 是一种磁共振成像技术.
- 医学物理 医学物理
- 生物医学工程 生物医学工程
背景情况:
- 磁共振成像 (MRI) 使用线性梯度和射频接收器灵敏度配置文件进行空间编码,从而导致较长的扫描时间.
- 卡尔特斯核磁共振 (MRI) 是一种常见的临床技术,可以在信号读取过程中使用并行成像和快速磁场调制来加速.
研究的目的:
- 为了研究一个优化的调制方案采样效率使用一个8通道局部线圈阵列加快2D卡尔提斯核磁共振扫描.
- 探索非线性编码以实现更快的MRI采集.
主要方法:
- 采用8通道局部线圈阵列,在信号读取过程中传输正弦电流,以加速二维卡特西安扫描.
- 基于重现内核希尔伯特空间的MRI采样理论被用来分析非线性编码效率.
- 使用电流监控器和ESPIRiT算法进行的现场校准方法促进了图像的重建.
- 各种调制场形状,别名控制和频率被评估为优化,并进行安全评估.
主要成果:
- 局部线圈阵列的最佳调制场接近2D卡特西安MRI的线性梯度场.
- 开发的现场校准技术使得体内扫描的速度加快了三倍和八倍.
- 实现了没有可见文物的加速扫描,有或没有SENSE (灵敏度编码).
- 安全性评估证实体内扫描是安全的.
结论:
- 该研究介绍了一种非线性编码分析工具,一种现场校准方法,以及加速MRI的安全评估程序.
- 这些通过体内扫描证明的进步,显著促进了使用局部线圈阵列的MRI扫描速度的增加.
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