. Author manuscript; available in PMC: 2020 Feb 13.

Published in final edited form as: Med Phys. 2019 Dec 10;47(2):441–456. doi: 10.1002/mp.13912

Table VII.

Summary of noise level in virtual single-energy computed tomography (vSECT) images at default and optimized dose partitioning factor (α) for biphasic liver imaging; note: the percentages in the parentheses indicate the noise increase (+) or decrease (−) on vSECT images with optimized $α_{I, G d}$ in reference to the default α.

Tube potential pair (kV)	Biphasic liver imaging
	Noise at default α		Noise at optimized $α_{I, G d}$
	$\sqrt{V_{120 k V, I}}$	$\sqrt{V_{120 k V, G d}}$	$\sqrt{V_{120 k V, I}}$	$\sqrt{V_{120 k V, G d}}$
80/Sn150	67.6	79.7	61.9 (−8.4%)	69.3 (−13.0%)
90/Sn150	99.6	110.3	88.8 (−10.8%)	94.2 (−14.6%)
100/Sn150	153.5	164.8	118.6 (−22.7%)	121.8 (−26.1%)