Dose values for 45 patient scans with use of the high-quality protocol. Dose values for 45 patient scans with use of the high-quality protocol. A, B, and C show the histogram of patient scans with respect to the CTDI, DLP, and DAP. The distributions are similar for the 3 dose measurement techniques. The DAP measured on-line shows a good linear correlation to the estimated CTDIw value (D). Note: The red lines and red dotted lines indicate the mean value and SD. Y. Kyriakou et al. AJNR Am J Neuroradiol 2008;29:1930-1936 ©2008 by American Society of Neuroradiology