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Table 1 Physical properties of media

From: Effects of breast structure on high-intensity focused ultrasound focal error

  Skin Fibroglandular Fat Water
Density (kg/m3) 1090 1032 985 998.2
Sound speed (m/s) 1615 1547 1465 1482
Characteristic impedance (× 106 Pa.s/m) 1.760 1.597 1.443 1.479
Attenuation coefficient (dB/m/MHz) 60 40 0.22