Filtering of oscillatory B0 behavior in NMR devices
US6271666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1999 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | May 21, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/56563
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention, in one form, provides compensation for the effects of an oscillatory B0 eddy current B.sub.e (t) in an NMR apparatus. In an NMR apparatus having a transmitter generating a spin excitation signal and a receiver detecting an NMR signal, applied gradient signals are analyzed to estimate a resulting oscillatory B0 eddy current B.sub.e (t). The frequency of either the transmitter or the receiver of the NMR apparatus, or both, is shifted in frequency by an amount proportional to B.sub.e (t) to achieve compensation. The applied gradient signals are digitized and filtered using a recursive filter that is based upon an oscillatory model of the oscillatory B0 eddy current B.sub.e (t)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.