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Each marker represents a brain region. When the coil is located 12mm away from isocenter (top), FA is under-estimated by approximately 11% in most brain regions. The under-estimation of FA becomes more pronounced (−16%) at a 18 mm coil offset to isocenter (middle). When the coil is furthest away from isocenter, at a 24 mm offset, FA is underestimated by 21% (bottom).
