My software does not support xml/REC. Philips has deprecated the PAR/REC, but now provides researchers with a direct NIfTI conversion as well as well-specified DICOM files. My software will handle Philips DICOM, but I do not have the time to add support for xml/REC. As far as I know, none of the popular PAR/REC->NIfTI converts (dicm2nii, R2A_GUI, dcm2niix, etc) have supported the xml/REC format. I think your options are 1.) search the web for a tool that supports xml/REC (and if you find one, tell me), 2.) use Philips DICOM or direct NIfTI instead of xml/REC, 3.) Make your own xml/REC converter (you could start with a open source PAR/REC converter like dcm2niix and dicm2nii and share your results with the community with a pull request). A promising avenue might be to contact Alexander Leemans who has developed exploreDTI - I believe his project is closed source, but it is matlab based, and if he is willing to share his xml/REC parser you could bolt that onto dicm2nii without too much effort.