Helical and single-slice conventional CT versus electron beam CT for the quantification of coronary artery calcification. - Becker,C.R.; Jakobs,T.F.; Aydemir,S.; Becker,A.; Knez,A.; Schoepf,U.J.; Bruening,R.; Haberl,R.; Reiser,M.F. (Am J Roentgenol, 2000)