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Elimination of eddy current artifacts in diffusion‐weighted echo‐planar images: The use of bipolar gradients
Author(s) -
Alexander Andrew L.,
Tsuruda Jay S.,
Parker Dennis L.
Publication year - 1997
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910380623
Subject(s) - eddy current , distortion (music) , planar , echo planar imaging , diffusion , nuclear magnetic resonance , echo (communications protocol) , waveform , physics , materials science , computer science , magnetic resonance imaging , voltage , medicine , amplifier , computer network , computer graphics (images) , optoelectronics , cmos , quantum mechanics , radiology , thermodynamics
Small gradient fields resulting from incompletely canceled eddy currents can cause geometric distortion in echo‐planar images. Although this distortion is negligible in most echo‐planar applications, the large gradient pulses used in diffusion‐weighted echo‐planar imaging can result in significant image distortion. In this report, it is shown that this distortion can be significantly reduced by the application of bipolar gradient waveforms. Both bipolar diffusion‐sensitizing gradients and an inverted gradient preparatory pulse were examined for minimizing the eddy currents responsible for these distortions.