Table 1.

The various tissue equivalent inserts and densities of the electron density phantom.

Low Contrast Material		High Contrast Material
Tissue Equivalent Inserts	Density Relative to Water	Tissue Equivalent Inserts	Density Relative to Water
Breast	$-1\%$	Lung Inhale	$-80\%$
Adipose	$-3\%$	Lung Exhale	$-50\%$
Muscle	$+6\%$	Trabecular Bone	$+16\%$
Liver	$+7\%$	Dense Bone	$+61\%$