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Interpolation of volume values on MRI #609

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ftadel opened this issue Apr 3, 2023 · 0 comments
Open

Interpolation of volume values on MRI #609

ftadel opened this issue Apr 3, 2023 · 0 comments

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@ftadel
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ftadel commented Apr 3, 2023 •
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Exploring the display of the leadfield sensitivity with @tmedani, I found some disturbing behaviors that I haven't had time to investigate.

Two use cases:

  • Right-click on volume head model > View leadfield sensitivity (MRI viewer)
  • Right-click on volume source maps > Cortical activations > Display on MRI (MRI viewer)

Then right-click on the MRI Viewer figure > Overlay options > Interpolation sources-MRI > Resolution...

With Resolution: 2 voxels, I observed results for depth EEG stimulation that seem to be off by a few voxels:
image

With Resolution: 3 voxels, the display is completely off...
image

These menus change the property InterpDownsample, which is then passed as the input parameter nDownsample to grid_interp_mri.m.

The interpolation algorithm used there could probably be fixed and optimized (using newer Matlab interpolation options for example)
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