Table 2.

Relative dose and fixed tube current setting for the different simulated patient sizes. Because only one low contrast detectability phantom size was available, different tube current settings were used to achieve noise levels representing scans of different sizes of patients.

Dose	Small ($\mathrm{FBP}\text{noise}=12\mathrm{HU}$)	Medium ($\mathrm{FBP}\text{noise}=17.5\mathrm{HU}$)	Large ($\mathrm{FBP}\text{noise}=22\mathrm{HU}$)
Full dose	180 mA	90 mA	60 mA
75% dosea	140 mA	70 mA	45 mA
50% dose	90 mA	45 mA	30 mA
33% dose	60 mA	30 mA	20 mA
25% doseb	45 mA	20 mA	NA

^aIndicates 77% dose for the small and medium size settings.

^bIndicates 22% for the medium size setting.