发明名称 |
Pulse sequence for a nuclear magnetic resonance apparatus |
摘要 |
A sequence of chronologically non-equidistant radio frequency excitation pulses and a first gradient are activated during an excitation phase. The existing spin magnetization is divided into sub-groups by each excitation pulse that follows the first excitation pulse. A chronologically graduated focusing of the individual sub-groups ensues during the read-out phase under a further gradient. A number of nuclear magnetic resonance signals can thereby be acquired following a single excitation phase, so that a short image pick-up time becomes possible, without the necessity of a fast switching of the gradients. Further, pure spin echoes can be acquired, which are insensitive to local field inhomogeneities in comparison to gradient echoes.
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申请公布号 |
US5432448(A) |
申请公布日期 |
1995.07.11 |
申请号 |
US19940308970 |
申请日期 |
1994.09.20 |
申请人 |
SIEMENS AKTIENGESELLSCHAFT |
发明人 |
HEID, OLIVER;DEIMLING, MICHAEL |
分类号 |
A61B5/055;G01N24/08;G01R33/46;G01R33/48;G01R33/561;(IPC1-7):G01R33/44 |
主分类号 |
A61B5/055 |
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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