Dosimetry and Comparison between Different CT Protocols (Low Dose, Ultralow Dose, and Conventional CT) for Lung Nodules’ Detection in a Phantom

Table 2

Estimated equivalent doses.

Protocol	kV	mA	Equivalent entrance skin dose/uncertainty (mSv)	Equivalent dose to the lung/uncertainty (mSv)
Ultralow dose	80	30	0.5/0.06	0.6/0.06
Low dose (lower mA)	120	20	1.32/0.26	1.32/0.12
Low dose (lower kV)	100	30	1.34/0.3	1.5/0.3
Conventional low dose	120	30	1.8/0.36	2.0/0.16
Conventional HRCT	120	Automatic	9.0/0.8	9.0/0.58