Mass density (g/cm3)

Electron density

Air

0.00

0.00

Lung

0.28

0.29

Adipose

0.94

0.93

Breast

0.98

0.96

Water

1.00

1.00

Soft tissue

1.02

1.01

Muscle

1.05

1.02

Liver

1.10

1.06

Mineral bone

1.15

1.10

Cortical bone

1.82

1.69