BIRN License Yes NITRC Gradient Non-linearity Unwarping Tool Linux Yes Python, C The Brain Morphometry testbed of the BIRN provides a tool to correct gradient non-linearity distortions in MR structural images. This correction improves test-retest reproducibility crucial for multi-site studies. 2009-7-01 4 - Beta 2.01 2009-2-26 4 - Beta 2.0 2008-1-01 4 - Beta V1.0 Gradient Non-linearity Unwarping Tool Artifact Removal, 4 - Beta, Python, MR, Console (Text Based), End Users, BIRN License, English, Linux, C, DICOM, NIfTI-1, Hypertension, Bipolar Disorder,