A new method is presented for the amelioration of eddy-current-induced \(B_{0}\) shifts based on direct FM modulation of the spectrometer transmitter and receiver reference frequencies. The waveform for correction is based on a dynamic spherical-harmonic expansion of the temporal field, requiring no
Correction of eddy-current-induced B0 shifts by receiver reference-phase modulation
β Scribed by Stuart Crozier; Craig D Eccles; Frank A Beckey; James Field; David M Doddrell
- Publisher
- Elsevier Science
- Year
- 1992
- Weight
- 268 KB
- Volume
- 97
- Category
- Article
- ISSN
- 0022-2364
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## Abstract As a consequence of the timeβvarying magnetic field induced by eddy currents, frequency drifting occurs when the sampling window of localized spectroscopy continuously shifts. The frequency drifting and the concomitant phase variations can severely affect spectroscopy results when data
Gradient pulses used in most localization techniques induce time-dependent shifts in Bo that strongly distort NMR signals. A postprocessing correction method requiring no additional hardware is proposed. The phase shift produced by the Bo shift is calculated from a reference free induction decay (FI