Usage: estimate distortion (single project)


This is the procedure for a single project. For multiple projects, please see below.

1a. On the "General options" tab, select the option "Single project version: select files manually". Select either just "Estimate voxel displacement map (VDM)" or "Estimate VDM and apply VDM to same data". The voxel displacement map will be saved in *.map file format, which can be overlaid on FMR files; this may be useful to see the algorithm's result.
When selecting "Estimate VDM and apply VDM to same data", the voxel displacement map (VDM) is applied to the data that have been used to estimate the distortion. In case there are no further runs, this eliminates the need to run the second step via the "Apply" tab.

2a. Parameters: Choose the A>>P/P>>A or L>>R/R>>L files using the Browse button on the first two lines. Select the options and parameters via the Parameters tab.

3a. Select the EPI run and the opposite phase-encoded EPI. Also, the volume to estimate from can be selected. For diffusion-weighted data (spin echo EPI), a b=0 volume is usually best.

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Latest update of this page: 3 October 2019