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Table 2: Automated tube current modulation: manufacturer and principle
Manufacturer Trade Name Image Quality Reference Principle
GE Healthcare AutomA, SmartmA Noise index Maintain a constant noise level (defined as noise index), using tube current within prescribed minimum and maximum values
Toshiba Sure Exposure SD Maintain a constant noise level (defined in standard deviation), using tube currents and preset minimum and maximum values
Siemens CARE Dose4D Quality reference milliampere-second Maintain the same image quality with reference to target effective milliampere-second levels for standard-size patients
Philips DoseRight Reference image Keep the same image quality as in the reference image

Manufacturer	Trade Name	Image Quality Reference	Principle
GE Healthcare	AutomA, SmartmA	Noise index	Maintain a constant noise level (defined as noise index), using tube current within prescribed minimum and maximum values
Toshiba	Sure Exposure	SD	Maintain a constant noise level (defined in standard deviation), using tube currents and preset minimum and maximum values
Siemens	CARE Dose4D	Quality reference milliampere-second	Maintain the same image quality with reference to target effective milliampere-second levels for standard-size patients
Philips	DoseRight	Reference image	Keep the same image quality as in the reference image