King's College London

Research portal

Minimization of Nanodroplet Activation Time using Focused-Pulses for Droplet-Based Ultrasound Super-Resolution Imaging

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ge Zhang, Sevan Harput, Jiaqi Zhu, Kirsten Christensen-Jeffries, Jemma Brown, Chee Hau Leow, Chris Dunsby, Robert J. Eckersley, Meng Xing Tang

Original languageEnglish
Title of host publication2019 IEEE International Ultrasonics Symposium, IUS 2019
PublisherIEEE Computer Society
Pages372-375
Number of pages4
Volume2019-October
ISBN (Electronic)9781728145969
DOIs
Publication statusPublished - 1 Oct 2019
Event2019 IEEE International Ultrasonics Symposium, IUS 2019 - Glasgow, United Kingdom
Duration: 6 Oct 20199 Oct 2019

Conference

Conference2019 IEEE International Ultrasonics Symposium, IUS 2019
CountryUnited Kingdom
CityGlasgow
Period6/10/20199/10/2019

King's Authors

Abstract

One of the crucial challenges in the application of ultrasound super-resolution imaging using microbubble contrast agents to the clinic is the long acquisition time. Recently acoustic wave sparsely activated localization microscopy (AWSALM) was developed to activate, image, and destroy nanodroplets to achieve ultrasound super-resolution imaging. The activation and destruction of nanodroplets using focused pulses in AWSALM can generate new localization signals without relying on flow and shows the potential to achieve faster ultrasound super-resolution. However, the technique requires optimization to achieve good activation efficiency with the minimum amount of activation time.This work investigates how the different activation strategies affect the activation time and efficiency. A range of activation sequences with different F-numbers and spacing between transmit foci are used and their activation efficiency and the data acquisition time are quantified. The results show that sweeping the focus of the activation pulse with an F-number of 0.4 and a step size of 2.5 wavelengths can generate the highest droplet activation. By using a larger or smaller spacing between consecutive focused activation beams generated lower contrast, which suggests that densely spaced activation pulses may destroy the activated nanodroplets generated by the previous activation pulse. In summary, this study demonstrates that the rate of activation of nanodroplets can be increased by optimizing the F-number and the sweep step size. This finding can inform the development of droplet-based super-resolution imaging to further minimize the data acquisition time.

View graph of relations

© 2018 King's College London | Strand | London WC2R 2LS | England | United Kingdom | Tel +44 (0)20 7836 5454