发明授权
US5652514A Correction for field variation in steady-state MRI by repeated
acquisition of zero k-space line
失效
通过重复采集零k空间线来校正稳态MRI中的场变化
- 专利标题: Correction for field variation in steady-state MRI by repeated acquisition of zero k-space line
- 专利标题(中): 通过重复采集零k空间线来校正稳态MRI中的场变化
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申请号: US621240申请日: 1996-03-25
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公开(公告)号: US5652514A公开(公告)日: 1997-07-29
- 发明人: Weiguo Zhang , David M. Kramer , David M. Goldhaber
- 申请人: Weiguo Zhang , David M. Kramer , David M. Goldhaber
- 申请人地址: CA Tustin
- 专利权人: Toshiba America MRI, Inc.
- 当前专利权人: Toshiba America MRI, Inc.
- 当前专利权人地址: CA Tustin
- 主分类号: G01R33/54
- IPC分类号: G01R33/54 ; A61B5/055 ; G01R33/565 ; G01V3/00
摘要:
Methods and apparatus for correcting image artefacts caused by variations in the main magnetic field of an MRI system are disclosed, particularly for MRI with steady-state spin precession. For field correction in MRI with steady-state spin precession, the effects of the field changes can be corrected by quantifying the time course of the field drifts by repeated acquisition of the zero k-space lines. The change in the phase between consecutive zero k-space lines is used as an indicator of field variation and for correction of associated image artifacts. By using for field correction the zero k-space lines acquired using the imaging sequence itself, the steady-states of spin precession are undisturbed throughout the MRI data acquisition.