Fix the simulation up such that the classes of image data in contrast generator are of SIRF types,
i.e. the contrast_filledvolumes in PET and MRContrastGenerator can be interfaced easily with the SIRFReg resampler and the whole project is more consistent.
Fix the simulation up such that the classes of image data in contrast generator are of SIRF types, i.e. the contrast_filledvolumes in PET and MRContrastGenerator can be interfaced easily with the SIRFReg resampler and the whole project is more consistent.