. 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 VIII.

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

Tube potential pair (kV)	Small bowel imaging
	Noise at default α		Noise at optimized α_I,Bi
	$\sqrt{V_{120 k V, I}}$	$\sqrt{V_{120 k V, B i}}$	$\sqrt{V_{120 k V, I}}$	$\sqrt{V_{120 k V, B i}}$
80/Sn150	14.9	19.1	15.3 (+2.7%)	16.8 (−12.0%)
90/Sn150	15.7	19.5	16.5 (+5.1%)	17.5 (−10.3%)
100/Sn150	20.8	25.5	20.0 (−3.8%)	19.5 (−23.5%)