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This figure illustrates the effect of “chamber length” for a 120 kVp spectrum in PMMA with a body bow tie filter. The length of the phantom in all cases is infinite, while the length of integration was 10 mm, 100 mm, and infinite. Thus, this graph compares CTDI10mm, CTDI10mm, and CTDI∞ for the central measurement position. The inset shows the percent increase in dose coefficient as a function of cylinder diameter, from CTDI100 to CTDI∞.
