title: Removing effects of eddy currents in proton MR spectroscopy.
abstract: The use of pulsed gradients to define a volume of interest for localized magnetic resonance spectroscopy produces magnetic field perturbations which distort both the free induction decay and the spectrum after Fourier transformation. A technique is presented that removes the artifacts from eddy currents from a sampled free induction decay. To linearize the phase, the nonlinear phase of a reference free induction decay is subtracted from the phase of a sample free induction decay. Next, to move the frequency to resonance and perform a zero-order phase correction, the line fit from a linear regression is subtracted from the phase. After reconstructing the free induction decay, the resulting frequency spectra are sorted into absorption mode and dispersion mode components.
authors.affiliation: Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, Tennessee 37232-2675.
authors.forename: W R
authors.initials: WR
authors.lastname: Riddle
authors.forename: S J
authors.initials: SJ
authors.lastname: Gibbs
authors.forename: M R
authors.initials: MR
authors.lastname: Willcott
mesh_terms: D016477:Artifacts; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*