Table 1.

Ground truth mass densities and RSPs (based on Eq. (1)), as well as mean excitation energies and elemental compositions for the CIRS 062M and CIRS Atom M701, M702, and M705 phantoms.

	Tissue surrogate	$\mathit{\rho }\left(\text{g/c}{\text{m}}^{\text{3}}\right)$	RSP	$\text{I}\left(\text{eV}\right)$	H	C	N	O	Mg	P	S	Cl	Ca	Ba
CIRS062M	Lung (Inhale)	0.203	0.202	67.8	8.59	65.92	3.52	19.27				1.69	1.01
	Lung (Exhale)	0.494	0.492	67.3	8.87	66.00	2.38	20.41				0.61	1.73
	Adipose	0.965	0.977	64.2	9.97	71.36	1.79	16.37				0.19	0.32
	BreastTissue	0.996	1.003	65.2	9.60	70.33	1.92	17.02				0.19	0.94
	Muscle	1.059	1.059	66.6	9.07	69.78	2.07	16.80				0.12	2.16
	Liver	1.072	1.070	66.8	8.97	69.45	2.12	17.14				0.13	2.19
	Bone 200 mg/cc	1.157	1.116	76.2	7.00	56.30	2.00	22.70		3.30		0.20	8.50
	Bone 800 mg/cc	1.520	1.404	90.4	4.45	39.11	0.87	33.72				0.05	21.77	0.03
	Bone 1250 mg/cc	1.830	1.647	101. 5	3.60	28.82	1.09	31.99		10.79	0.08	0.04	23.27	0.32
CIRS Atom	Lung	0.205	0.204	67.8	8.59	65.89	3.52	19.29				1.69	1.01
	Breast	0.991	0.982	70.4	9.60	70.26	1.93	17.00				0.20	9.40
	Soft Tissue	1.055	1.041	70.4	8.47	57.44	1.65	24.59	7.62			0.19
	Spinal Cord	1.065	1.035	73.4	7.36	54.27	2.17	26.59	9.37			0.22
	Brain	1.069	1.049	72.2	8.16	53.60	1.53	26.49	9.98			0.19
	(M701/M702)	1.586	1.410	88.3	4.83	37.03	0.97	35.66	6.19			0.05	15.24
	Bone (M705)	1.518	1.422	85.5	5.23	41.63	1.11	33.31	3.54			0.05	15.09