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3 May 2002 Correcting eddy current effects in hybrid spaces using phase gradients
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We propose a new technique for the correction of eddy- current effects in the k-space domain using the non- diffusion weighted image as a reference. To avoid affecting the contrast properties constant masks were derived form the original images by thresholding and averaging. A 2D polynom was calculated in the Fourier domain that describes a distribution of phase gradients which contains the information how to correct the misregistered pixels. The technique does not need any field map or additional calibration scans within the measurement sequence. The distortions in the fiber tracts, the bias and the variance in the anisotropy values were minimized while preserving an acceptable signal to noise ratio. The algorithm is computationally not very intensive and easy to implement.
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Claus Kiefer, Martin Buerki, Andrea Federspiel, and Gerhard Schroth "Correcting eddy current effects in hybrid spaces using phase gradients", Proc. SPIE 4682, Medical Imaging 2002: Physics of Medical Imaging, (3 May 2002);

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