Dear All,
We have been using mri_convert to convert .nii format quantitative scans (specifically R1 volumes) into .mgz (float) format, so they can be used as input to mri_vol2surf. Inputting the .nii files to mri_vol2surf has produced an error in values in the output paint file, whereas this issue appears not to occur with the .mgz input.
In running mri_convert, we are encountering an issue with the scaling of image values. Optimally, we would like to preserve the values within the quantitative volume, such that mri_convert does not change these when we output to .mgz. In some cases, we have noted non-linear differences in the output .mgz values, compared to the input volume. We have been using the -ns flag, and still see these issues.
Is there a way to set the output .mgz scale factor to preserve the existing values exactly as per the quantitative input volume?
Any advice would be greatly appreciated. Many thanks in advance.
Best wishes, Dan
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Daniel Carey Marie Curie Ph.D. Fellow, Centre for Brain and Cognitive Development, 32 Torrington Sq., London WC1E 7HX UK
email: d.carey@bbk.ac.uk web: http://www.cbcd.bbk.ac.uk/people/students/daniel_carey