I don't have a Philips system, and the equations were provided by others. If you want to send me a sample dataset (send dropbox link via private email) I would be happy to examine it. Otherwise, you can make the required modifications yourself to the function PhilipsPreciseVal() in nii_dicom.cpp and submit a github pull request. It sounds like you are suggesting that the line "d.intenScale = l1-l0;" needs to be re-written as the reciprocal, e.g. reading "d.intenScale = 1.0f/l1-l0;". You would want to check that.