Table 3:

Comparison of pCT and x-ray CTs RSP for the pig’s head. Differences are between the pCT and respective x-ray scans.

Region	Volume (cm3)	pCT RSP			Hor CTa RSP	Diff (%)	Hor CTb RSP	Diff (%)	Vert CT RSP	Diff (%)
		Mean	SD	SE(%)
Bullae	0.8	0.491	0.24	1.7	0.684	−39.3	0.690	−40.5	0.634	−29.1
Adipose	3.7	0.950	0.14	0.2	0.961	−1.2	0.962	−1.3	0.954	−0.4
Muscle	2.0	1.033	0.16	0.3	1.058	−2.4	1.059	−2.5	1.052	−1.8
Tongue	9.4	1.047	0.23	0.2	1.035	1.1	1.036	1.1	1.031	1.5
Brain Stem	0.7	0.994	0.16	0.6	1.038	−4.4	1.038	−4.4	1.016	−2.2
Brain	2.5	1.025	0.16	0.3	1.037	−1.2	1.039	−1.4	1.031	−0.6
Lens	0.1	1.099	0.12	1.6	1.078	1.9	1.080	1.7	1.076	2.1
Eye Left	0.5	1.015	0.13	0.5	1.015	0.0	1.017	−0.2	1.018	−0.3
Eye Right	0.8	1.011	0.15	0.5	1.021	−1.0	1.021	−1.0	1.014	−0.3
Skull	0.5	1.266	0.12	0.4	1.297	−2.4	1.303	−2.9	1.320	−4.3
Mandible	0.5	1.540	0.16	0.5	1.559	−1.2	1.565	−1.6	1.562	−1.4
Sinus Air	0.1	0.067	0.12	17	0.057	15	0.058	13	0.039	42

^aLow dose protocol

^bHigh dose protocol