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在高性能梯度系统上的3D轴向螺旋堆成像中,对二次并发场进行回顾性校正

Afis Ajala¹, Nastaren Abad¹, Thomas K F Foo¹

¹GE HealthCare, Technology and Innovation Center, Niskayuna, New York, USA.

Magnetic resonance in medicine

|April 23, 2024

概括

这项研究引入了一种新的方法来纠正3D螺旋图像中的并发场所引起的MRI文物. 该技术显著减少了模糊,改善了高级神经成像应用的图像质量.

科学领域:

磁共振成像是一种磁共振成像技术.
医学物理医学物理
神经成像是一种神经成像.

背景情况:

在MRI中高性能梯度系统,特别是3D螺旋堆 (SoS) 读数,容易受到二次并发场的影响.
这些场引发空间变化的工件,如信号丢失和模糊,随着距离梯度同心的距离而恶化.

研究的目的:

描述和评估一种用于补偿二次并发场的新方法,用于3D轴向SoS图像重建中的二次并发场.
为了减轻图像工件和提高先进的MRI序列的诊断准确度.

主要方法:

开发了一种回顾性校正方法,应用基于名义螺旋轨迹的切片依赖k空间相补偿.
该方法纠正了3D SoS数据中二次并发场引起的相位错误.
使用幻影和健康志愿者的3T扫描与3D伪连续动脉旋转标记 (ASL) 使用SoS快速旋转回声读出进行了有效性测试.

主要成果:

提出的方法可以大幅减少图像模糊.
幻影扫描显示~53%的模糊减少在98毫米从同心点.
在体内3DASL扫描显示了高达10%的差异在纠正与未经纠正的图像 (质子密度, perfusion-weighted,和脑血流图) 在78毫米从同位中心,特别是在灰白物质接口.

结论:

开发的回顾性校正方法有效地解决了三维轴向SoSMRI中二次并发场引起的相位错误.
这种技术为在先进的MRI应用中提高图像质量和可靠性提供了有价值的工具.

关键词:

三维螺旋的堆.同时发生的梯度场.高性能梯度梯度的高性能性能梯度.perfusion 图像成像技术的使用

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