Michael,
Thank you for the quick reply. I have added csf masking.
Here are my values when I compare the perfusion_calib and CBF images (single voxel in the precuneus)
Perfusion_calib value: 175.78
CBF value: 285.97
There is also a significant difference in the signal intensity of the image (the perfusion_calib image is much darker; min-max for perfusion_calib image is 0 to 401, min-max for the CBF image is 0 to 297).
Adding the partition co-efficient to step 3 is good to know, but the values are still high.
Any suggestions?
Raoul
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