As I understand it in the US you legally have access to the data as it's part of your medical records. In my experience it's as simple as asking, they give you

As I understand it in the US you legally have access to the data as it's part of your medical records. In my experience it's as simple as asking, they give you a CD-R containing some DICOM files and a freeware DICOM viewer. Maybe more modern health systems will let you just download the files.