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. Author manuscript; available in PMC: 2017 Jul 7.

Published in final edited form as: Phys Med Biol. 2017 May 4;62(13):5556–5574. doi: 10.1088/1361-6560/aa7122

Table 4.

The detail scan protocol for the physical phantom.

	120 kVp		90 kVp

	Normal-Dose	Low-Dose	Normal-Dose	Low-Dose
Exposure time (ms)	1776	1776	1776	1776
Tube current (mA)	282	56	282	56
CTDIvol (mGy)	53.1	10.6	24.1	4.8
Noise level $σ^{2}$ ( $\times 10^{- 4}$ )	0.012	1.682	0.034	2.328