发明授权
US06380738B1 Method and apparatus for reducing image artifacts caused by magnet vibration in an MR imaging system
失效
用于降低由MR成像系统中的磁体振动引起的图像伪像的方法和装置
- 专利标题: Method and apparatus for reducing image artifacts caused by magnet vibration in an MR imaging system
- 专利标题(中): 用于降低由MR成像系统中的磁体振动引起的图像伪像的方法和装置
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申请号: US09469864申请日: 1999-12-22
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公开(公告)号: US06380738B1公开(公告)日: 2002-04-30
- 发明人: Xiaohong Zhou
- 申请人: Xiaohong Zhou
- 主分类号: G01V300
- IPC分类号: G01V300
摘要:
A magnetic resonance (MR) imaging system including a method and apparatus for reducing image artifacts caused by magnet vibration is disclosed herein. The system includes a magnetic field vibration quantification and compensation scheme including quantifying a vibration error component included in the magnetic field configured to acquire k-space data corresponding to an MR image, and correcting the k-space data using the vibration error component. The vibration-induced magnetic field perturbation includes a spatially invariant magnetic field, a spatially linear readout magnetic field gradient, a spatially linear phase-encoding magnetic field gradient, and a spatially linear slice-selection magnetic field gradient. The vibration error component can be at least one of a spatially independent phase error of the spatially invariant magnetic field, a kx-space displacement error of the spatially linear readout magnetic field gradient, a ky-space displacement error of the spatially linear phase-encoding magnetic field gradient, and a slice-selection error of the spatially linear slice-selection magnetic field gradient.
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