TABLE I.

Comparison of RSP measurements obtained using the pCT scanner and using a water phantom depth-dose range shift measurement.

	Range shift		pCT
Material	RSP	${\sigma }_{\mathrm{RSP}}$	RSP	${\sigma }_{\mathrm{RSP}}$
Lung	0.267	0.005	0.268	0.001
Adipose	0.947	0.007	0.943	0.002
Muscle	1.032	0.008	1.037	0.002
Brain	1.062	0.007	1.064	0.002
Liver	1.076	0.005	1.078	0.002
Cortical bone	1.599	0.007	1.595	0.002