发明授权
- 专利标题: NMR selective excitation of bent slices
- 专利标题(中): 弯曲切片的NMR选择性激发
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申请号: US871154申请日: 1992-04-20
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公开(公告)号: US5258711A公开(公告)日: 1993-11-02
- 发明人: Christopher J. Hardy
- 申请人: Christopher J. Hardy
- 申请人地址: NY Schenectady
- 专利权人: General Electric Company
- 当前专利权人: General Electric Company
- 当前专利权人地址: NY Schenectady
- 主分类号: G01R33/54
- IPC分类号: G01R33/54 ; G01R33/20
摘要:
A method for reducing distortion in magnetic resonance (MR) images of a subject employs distortion compensating MR pulses in a conventional MR imaging sequence. The distortion compensating pulses are determined by first creating a conventional MR image of a slice of a subject having inherent distortions; constructing a target slice which is distorted in a manner opposite the direction of distortions in the slice image; taking a multi-dimensional Fourier transformation of the target slice to obtain a k-space region; choosing a continuous trajectory which efficiently traverses the k-space region; applying principles of multidimensional selective-excitation design to create simultaneous RF pulses and magnetic field gradient waveforms from the trajectory; and simultaneously applying the RF pulses and gradient waveforms in place of a traditional slice-select pulse in conventional MR imaging sequences to obtain images having reduced distortion as compared with conventional images.
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