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Abstract #3550

Error Analysis and Correction of ADC Measurements for Gradient Non-Linearity

Dariya I. Malyarenko1, Brian D. Ross1, Thomas L. Chenevert1

1Radiology - MRI, University of Michigan, Ann Arbor, MI, United States

Gradient non-linearity leads to spatially-dependent b-values and consequently significant non-uniformity error (~10-20%) in ADC measurements over clinically-relevant FOVs. For quantitative analysis of ADC errors, a gradient correction tensor model of spatially-dependent gradient fields was used. The model included the effect of imaging gradients, gradient cross-terms and their influence in presence of media anisotropy. All-inclusive error analysis allowed finding minimal number of spatial correction terms to achieve sufficient ADC error reduction (by 75-95%) for tissue-like diffusion anisotropy. Simplified ADC correction algorithm is suggested for implementation on MR systems based on known gradient hardware properties