Table 1:

Composition of the phantom

Element	Spheres			Annulus
Element	36 HU	34 HU	32 HU	500 HU
H	8.2	8.2	8.2	5.1
C	70.4	70.6	70.7	42.5
N	4.5	4.5	4.5	1.7
O	15.4	15.4	15.3	28.1
Na	0.0	0.0	0.0	0.0
Mg	0.0	0.0	0.0	0.0
Al	0.0	0.0	0.0	0.0
P	0.5	0.4	0.4	7.0
S	0.0	0.0	0.0	0.0
Cl	0.0	0.0	0.0	0.1
K	0.0	0.0	0.0	0.0
Ca	1.0	0.9	0.9	15.5

Data are in wt %.