Filter for {TAIL ~ an X ray device}, and {HEAD ~ X ray device} embodying such a filter 
Filter for { TAIL ~ an X ray device } , and { HEAD ~ X ray device } embodying such a filter
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH