"Imaging modalities have an inherent contrast resolution intrinsic to the modality itself, e.g. MRI, but this baseline resolution is commonly further modified by the tweaking of scan parameters and/or the use of contrast media."
Line 2:94·An e.g. list gives selected examples, so it should not end with 'and' or 'or': 'e.g. MRI, but this baseline resolution is commonly further modified by the tweaking of scan parameters and/or'.