Subject: Accuracy of 6 motion parameters with a big voxel size: 3x3x4 mm^3
Dear Colleagues,
I would like to ask you for your opinion about the SPM-Output including the 6 motion parameters (TXT-File from realignment) when using a BIG voxel size of 3x3x4 mm^3.
What is the accuracy of the numbers written in the txt-file?
While motion within the range of a half voxel length (around 1.5mm) may be a reliable number, values smaller than 0.4 mm (that would be smaller than 1/7 of a voxel length) have probably a low accuracy.
Does it make sense to discuss motion in the range between 0.0 and 0.4 mm when using voxels of 3x3x4 mm^3?
Are there comparisons between the SPM-values and a motion tracking system using such a big voxel size?
Thank you very much for your suggestions,
Best wishes,
Karsten
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