Last time, we covered how to use TORTOISE’s DIFF_PREP tool to preprocess Diffusion Weighted Images (DWI) to correct for eddy currents, motion, rotate the b-vectors (alongside the motion correction), and optionally correct b-splines if we used a T2-weighted structural image.  The next step is to use DIFF_CALC to fit tensors, inspect the results, measure ROIs, […]

These instructions are for an older version of TORTOISE, if you would like to read new instructions checkout the updated tutorial HERE! There are many options when deciding how to process Diffusion Weighted Images (DWI) and turn them into Diffusion Tensor Images (DTI).  I’ve written before about preprocessing in FSL (Part 1, Part 2) and AFNI (Part […]