Non-linear Response and Viscoelastic Properties of Lipid-Coated Microbubbles: DSPC versus DPPC
Ultrasound in Medicine & Biology , Volume 41 - Issue 5 p. 1432- 1445
For successful invivo contrast-enhanced ultrasound imaging (CEUS) and ultrasound molecular imaging, detailed knowledge of stability and acoustical properties of the microbubbles is essential. Here, we compare these aspects of lipid-coated microbubbles that have either 1,2-distearoyl- sn-glycero-3-phosphocholine (DSPC) or 1,2-dipalmitoyl- sn-glycero-3-phosphocholine (DPPC) as their main lipid; the other components were identical. The microbubbles were investigated invitro over the frequency range 1-4MHz at pressures between 10 and 100kPa, and their response to the applied ultrasound was recorded using ultrahigh-speed imaging (15 Mfps). Relative to DPPC-coated microbubbles, DSPC-coated microbubbles had (i) higher acoustical stability; (ii) higher shell elasticity as derived using the Marmottant model (DSPC: 0.26±0.13N/m, DPPC: 0.06±0.06N/m); (iii) pressure amplitudes twice as high at the second harmonic frequency; and (iv) a smaller amount of microbubbles that responded at the subharmonic frequency. Because of their higher acoustical stability and higher non-linear response, DSPC-coated microbubbles may be more suitable for contrast-enhanced ultrasound.
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van Rooij, T, Luan, Y, Renaud, G, van der Steen, A.F.W, Versluis, M, de Jong, N, & Kooiman, K. (2015). Non-linear Response and Viscoelastic Properties of Lipid-Coated Microbubbles: DSPC versus DPPC. Ultrasound in Medicine & Biology, 41(5), 1432–1445. doi:10.1016/j.ultrasmedbio.2015.01.004