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Proceedings Paper

Correcting eddy current effects in hybrid spaces using phase gradients
Author(s): Claus Kiefer; Martin Buerki; Andrea Federspiel; Gerhard Schroth
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Paper Abstract

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.

Paper Details

Date Published: 3 May 2002
PDF: 8 pages
Proc. SPIE 4682, Medical Imaging 2002: Physics of Medical Imaging, (3 May 2002); doi: 10.1117/12.465622
Show Author Affiliations
Claus Kiefer, Univ. Bern Univ. Hospital of Clinical Psychiatry (Switzerland)
Martin Buerki, Univ. Bern Hospital (Switzerland)
Andrea Federspiel, Univ. Hospital of Clinical Psychiatry (Switzerland)
Gerhard Schroth, Univ. Bern Hospital (Switzerland)

Published in SPIE Proceedings Vol. 4682:
Medical Imaging 2002: Physics of Medical Imaging
Larry E. Antonuk; Martin Joel Yaffe, Editor(s)

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