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(a) Dose spread function over an infinitely long CTDI phantom for a thin beam (38.4 mm full width) generated by the Monte Carlo simulation. (b) Example tube current profiles of TCM and constant tube current scans. (c) Accumulated dose profile for TCM and constant tube current scan derived by convolving the dose spread function with tube current profiles. (d) Dose ratio derived by dividing the accumulated dose profile of TCM scan by constant tube current scan.
