Table 1.

The mean ± 95% confidence interval of the viscoelastic shell properties of Definity® at room temperature and physiological temperature obtained using the de Jong model (de Jong et al. 1992). The shell properties reported for Definity^® at room temperature by other investigators (Faez et al. 2011; Goertz et al. 2007; Raymond et al. 2014) are listed for comparison along with the temperature and frequency-range used in the measurement.

Temperature	Frequency range (MHz)	Sp (N/m)	Sf × 106 (kg/s)
Room temperature
Present study	2 – 25	1.76 ± 0.18	0.21 ± 0.07
Goertz et al. (2007)	2 – 50	1.71 ± 0.24	0.015 ± 0.015
Faez et al. (2011)	5 – 15	1.64 ± 0.33	0.15 ± 0.02
Raymond et al. (2014)	2 – 25	1.76 ± 0.16	0.47 ± 0.05
Physiological temperature
Present study	2 – 25	1.01 ± .07	0.04 ± 0.04