Table 2.

Quantitative assessment of CT number variations in the phantom study before and after the use of TSFF.

	CT number range (HU)			Standard deviation of PSR artifacts (HU)			Noise (HU)
Location	FS	PS	PS + TSFF	FS	PS	PS + TSFF	FS	PS	PS + TSFF
ROI 1	2.3	22.3	1.6	0.6	6.3	0.4	12.4	12.9	12.1
ROI 2	2.9	8.7	2.2	0.7	2.7	0.5	12.1	12.3	11.8
ROI 3	2.2	10.6	1.5	0.5	2.9	0.3	11.5	12.5	11.4