发明名称 |
Magnetic resonance imaging method |
摘要 |
In order to measure a static field distribution with one scanning operation and to make image distortion corrections with the static field distribution and a gradient field distribution simultaneously considered, an image is reconstructed using a spin echo signal produced under the condition that a time interval between a 90 DEG pulse and a 180 DEG pulse differs from an interval between the 180 DEG pulse and the time origin of the spin echo signal, the static field distribution is evaluated from the relation of distortions to phase errors free from a phase distortion attributed to the characteristic of a detecting part and a phase distortion attributed to the dynamic characteristic of the gradient field, a relations existing between the spatial distortion and phase distortion of the reconstructed image and a magnetic field distribution including the gradient field is obtained, and the distortion magnitude of the reconstructed image is evaluated from the measured magnetic field distribution.
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申请公布号 |
US4724388(A) |
申请公布日期 |
1988.02.09 |
申请号 |
US19860869976 |
申请日期 |
1986.06.02 |
申请人 |
HITACHI, LTD. |
发明人 |
SANO, KOICHI;YOKOYAMA, TETSUO;KOIZUMI, HIDEAKI |
分类号 |
G01R33/565;(IPC1-7):G01R33/20 |
主分类号 |
G01R33/565 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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