title: Single bubble acoustic characterization and stability measurement of adherent microbubbles.
abstract: This article examines how the acoustic and stability characteristics of single lipid-shelled microbubbles (MBs) change as a result of adherence to a target surface. For individual adherent and non-adherent MBs, the backscattered echo from a narrowband 2-MHz, 90-kPa peak negative pressure interrogation pulse was obtained. These measurements were made in conjunction with an increasing amplitude broadband disruption pulse. It was found that, for the given driving frequency, adherence had little effect on the fundamental response of an MB. Examination of the second harmonic response indicated an increase of the resonance frequency for an adherent MB: resonance radius increasing of 0.3 ± 0.1 μm for an adherent MB. MB stability was seen to be closely related to MB resonance and gave further evidence of a change in the resonance frequency due to adherence.
authors.affiliation: Imaging Sciences Department, Imperial College, London, UK.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Casey
authors.forename: Charles
authors.initials: C
authors.lastname: Sennoga
authors.forename: Helen
authors.initials: H
authors.lastname: Mulvana
authors.forename: Jo V
authors.initials: JV
authors.lastname: Hajnal
authors.forename: Meng-Xing
authors.initials: MX
authors.lastname: Tang
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Eckersley
mesh_terms: D003287:Contrast Media / Q000737:chemistry*; D004355:Drug Stability; D008055:Lipids / Q000737:chemistry*; D008422:Materials Testing; D045423:Microbubbles; D014463:Ultrasonography / Q000379:methods*
chemical_list: D003287:Contrast Media; D008055:Lipids