Table 1.

Physical properties of contrast microbubbles (see Appendix for references to literature and determination procedure)

Initial bubble radius (R0)	1.25 ×10−6 m
Atmospheric pressure (patm)	101325 Pa
Coefficient of diffusivity of air in water (kA)	2.05 ×10−9 m2 s−1
Coefficient of diffusivity of SF6 in water	1.2 ×10−9 m2 s−1
Coefficient of diffusivity of C3F8 in water (kF)	7.45 ×10−10 m2 s−1
Coefficient of diffusivity of C4F10 in water	6.9×10−10 m2 s−1
Coefficient of diffusivity of C5F12 in water	6.3 ×10−10 m2 s−1
Coefficient of diffusivity of C6F14 in water	5.8 ×10−10 m2 s−1
Surface tension (γ)	0.025 N/m
Ostwald coefficient of SF6	5.4 ×10−3
Ostwald coefficient of C3F8 (LF)	5.2 ×10−4
Ostwald coefficient of C4F10	2.02 ×10−4
Ostwald coefficient of C5F12	1.17 ×10−4
Ostwald coefficient of C6F14	2.3 ×10−5
Ostwald coefficient of air (LA)	1.71 ×10−2
Permeability of air through the encapsulation (hA)	2.857 ×10−5 m s−1
Permeability of SF6 through the encapsulation	8.7 ×10−6 m s−1
Permeability of C3F8 through the encapsulation (hF)	1.2 ×10−6 m s−1
Permeability of C4F10 through the encapsulation	2.57 ×10−7 m s−1
Permeability of C5F12 through the encapsulation	9.04 ×10−8 m s−1
Permeability of C6F14 through the encapsulation	4.44 × 10−8 m s−1