Just realized - you mean Respiratory Rate, not blood pressure... I don't see how the increase in RR might be associated with perfusion. Maybe...
The PREFUL perfusion is calculated as described here: Perfusion quantification using voxel‐wise proton density and median signal decay in PREFUL...
If you're still thinking about trying to replicate these results: "This method can be applied at 1.5T or 3T with standard MR hardware without the...
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