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Hi,
 
I have a question about how trilinear interpolation works.
 
Briefly I am working on perfusion images with a voxel size of 4x4x6 mm. and T1 images with 1x1x1 mm. I have obtained GM segmentation on T1, I have the PVE map. I would like to obtain the perfusion value for GM. Therefore I obtained the linear tranformation matrix from T1 to perfusion image using FLIRT.
 
I am trying to find percentage volume of GM for a given perfusion image voxel. I believe it would NOT be very accurate to transform the PVE map to the perfusion image space using ApplyXFM using trilinear interpolation.
 
I understand how trilinear interpolation works while reslicing a low resolution image to get a high resolution image. But I am not sure how/which the PVE values are combined to obtain the PVE map for a lower resolution image using trilinear interpolation.
 
I hope my question is clear enough.
 
Thank you very much in advance.
 
Deniz.