Characterisation of polymer shelled microbubbles in wall less flow phantom using high frequency ultrasound and video microscopy

• Published in: Bubble science engineering and technology Vol. 3; no. 2; p. 73
• Main Authors: Chitnis, P V, Lee, P, Dayton, P A, Mamou, J, Ketterling, J A
• Format: Journal Article
• Language: English
• Published: England 01.11.2011
• Subjects: Contrast agents; Polymer shell; High frequency ultrasound
• ISSN: 1758-8960
• DOI: 10.1179/1758897911Y.0000000005

A high frequency ultrasound pulse echo system and a video microscope were combined to investigate the relationship between backscatter from polymer shelled ultrasound contrast agents (UCAs) and their diameter. Individual UCAs (manufactured by Point Biomedical or Philips Research) were imaged while being sonicated with 40 MHz tone bursts. The backscatter magnitude produced by the Philips UCAs was proportional to UCA size, which is consistent with theoretically predicted behaviour of encapsulated microbubbles driven at frequencies above resonance. Despite being smaller, the Point UCAs produced a backscatter magnitude twice that of Philips UCAs, indicating that Point UCAs might behave quasi-resonantly when excited at 40 MHz.