Method for obtaining amplitude and phase profiles of RF pulses for spatially selective excitation
US7999545B2 · kind B2 · utility
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Key dates
| Filing date | Dec 5, 2007 |
| Grant date | Aug 16, 2011 |
| Priority date | — |
| Expiry date | Sep 26, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/586
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining amplitude and phase dependencies of radio frequency pulses that are irradiated during traversal of a defined k-space trajectory to produce a spatial pattern of the transverse magnetization in an MR experiment using at least one RF transmission antenna, is characterized in that, in a calibration step, a set of basic pulses is defined, each basic pulse is irradiated individually, the specified k-space trajectory is traversed and at least one set of basic patterns is produced by detection of the MR signals thus excited, which in a range to be examined of the object, are proportional to the complex transverse magnetization produced, wherein the k-space trajectory is traversed fully identically every time at least from the beginning of the irradiation of each basic pulse, and, in a calculation step, a defined target pattern is approximated with a linear combination of the basic patterns of a set or with a mathematical association of linear combinations, with which, within each set, the basic patterns are identically combined, and the amplitude and phase dependencies to be determined are obtained as the corresponding linear combination of the basic pulses. Experi…
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