Why should standard eddy-current distortion correction techniques be avoided even for moderately high b-value data?
Mark S Graham 1 , Ivana Drobnjak 1 , and Hui Zhang 1
Department of Computer Science and Centre
for Medical Image Computing, UCL, London, United Kingdom
This work highlights issues with the current practice
for correcting eddy-current (EC) distortions on
moderately high b-value data and demonstrates their
mitigation with a simple alternative. Both techniques
are evaluated on real and simulated data, and the
importance of EC correction for estimating
microstructure is illustrated with the NODDI model. We
demonstrate that correcting moderately high b-value data
with standard EC correction techniques introduces
distortion that compromises the anatomical
correspondence between the DWIs and leads to
questionable estimates of microstructural features. We
show our alterative circumvents these issues and
provides good correction.
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