"Who established that the DViS is a low radiation emitting device?"
Who established that it is not a low radiation emitting device?
Just because you think something may be true, does not in fact make it true.
FDA reviews get the technical aspects of the equipment review done early on in the review process. The radiation issue would have been addressed long ago by two different review teams.
Apparently, You still do not see that the article that you referenced proved the opposite of what you were ascerting?
So you now are trying to ascert that the "quality of the images" is the problem. You can not prove either ascertions, nor can you provide any viable evidence of what you claim. Your "Well, if it is a low dose machine, it must be the quality of the images." argument is losing ground fast.
Your opinion is simply your opinion, not proof.