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Fig 4. Example of RF inhomogeneity artifact. On the DIR image (A), an apparent cortical lesion is visible (white arrow). On the PSIR image (B), there is again no corresponding hypointensity. On DIR, the signal intensity is 38% higher for the apparent lesion than the contralateral area, compared with 14% for PSIR. The relative insensitivity of PSIR to the RF artifact allows rejection of the lesion on DIR as a false-positive.
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