Personally identifiable data, explicitly including photographs, are protected health information and are therefore their access and transmission are subject to

Personally identifiable data, explicitly including photographs, are protected health information and are therefore their access and transmission are subject to various legal restrictions in the United States due to HIPAA (at the very least). But the question is much more important than this, so I'd recommend not drawing this particular analogy. The degree to which backscanners are like a physician visit is only minimally related to the degree to which they are intolerable in a free society.