It will not used trilinear interp. Try it with nearest neighbor

On 2/10/19 11:55 AM, Matthieu Vanhoutte wrote:

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Dear Douglas,

Before using "mri_gtmpvc --psf 0 --no-tfe -- rbv" according your advice to obtain voxel-wise output rescaled without PVC correction, I have done sequentially the different steps to obtain this output. However, when comparing voxel-wise rescaled output (rbv.nii.gz) between the two methods, final values at each voxel are not the same…

To obtain first rescaled voxel-wise output I have used sequentially these steps:

1. Concatenate transforms from PET space to gtmseg.mgz
2. Register native PET into gtmseg space (trilin. interpolation)
3. Compute mean PET inside reference regions (with regions masks from gtmseg.mgz)
4. Compute intensity normalized PET images in gtmseg space

Doesn’t the "mri_gtmpvc --psf 0 --no-tfe -- rdv" command use these same steps ?

Best, Matthieu

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