{HEAD ~ An X ray generator} 12, wherein {TAIL ~ said negative potential} is controlled so as to regulate a tube current 
wherein
{ HEAD ~ An X ray generator } 12 , wherein { TAIL ~ said negative potential } is controlled so as to regulate a tube current
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH