基于迪克森的B0自导航在辐射星堆中的多回声梯度回声成像
Jonathan Stelter1, Kilian Weiss2, Mingming Wu1,3
1Institute of Diagnostic and Interventional Radiology, School of Medicine and Health, Technical University of Munich, Munich, Germany.
Magnetic resonance in medicine
|August 19, 2024
概括
一种基于迪克森的新方法使用自导航来纠正身体磁场变化.MRI. 这种技术通过解决运动诱导的工件,特别是脂肪含有组织的定量成像,提高了定量成像.
科学领域:
- 磁共振成像 (MRI) 是一种磁共振成像技术.
- 定量身体成像技术 定量身体成像技术
- 生物医学工程 生物医学工程
背景情况:
- 时间磁场 (B0) 变化是定量体MRI的辐射星堆梯度回声成像的一个重大挑战.
- 这些B0变异可能导致信号损失,相位移,以及不准确的定量参数估计,影响诊断可靠性.
- 现有的校正方法可能需要对MRI采集序列进行修改,从而限制了它们的适用性.
研究的目的:
- 开发和验证基于迪克森的自导航方法,用于估计和纠正辐射星梯度回声成像中的时间B0变化.
- 评估B0变化对现场地图,质子密度脂肪分数 (PDFF) 和B0地图的影响.
- 评估拟议方法在纠正缓慢的B0漂移和运动诱导的B0变化的有效性.
主要方法:
- 在过量采样的k空间中心上使用基于图形切割的水脂肪分离算法估计了B0自导航器.
- 应用一维 (1D) 校正,以解决辐射射线之间的相位差异.
- 进行了三维 (3D) 运动解析重建,用于时空B0变异校正,通过模拟,幻影实验和体内部扫描进行验证.
主要成果:
- 时间B0变化导致B0的低估,而PDFF映射显示敏感性较低.
- B0自导航器有效地捕捉了缓慢的漂移和呼吸运动引起的变化.
- 虽然1D校正足以用于幻影研究,但3D校正在体内是必要的,以解决空间变化的B0变化,改善现场图和B0准确性并减少文物.
结论:
- 时间的B0变化对辐射星堆成像中的B0映射产生了重大影响,特别是在脂肪的存在下.
- 开发的自导航方法允许在不改变MR获取协议的情况下进行B0校正.
- 这种方法有效地纠正B0漂移和生理运动诱导的B0变化,提高身体MRI的定量准确性.
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