Concerning this post, as pain patients often do have MRI's; the present article may be of interest to you, concerning upright position scans, the prone position being problematic and often itself being reported as exacerbating (worsening) pain..

 

A technical note:  on this computer the first link was problematic, but the second leads to a list including this article.

 

A direct link may be:

 

Best wishes, and thanks to all, LDMF.

http://www.fonar.com/news
/111507.htm or
http://tinyurl.com/88mon