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Effects of Aberration on Super-Resolution Ultrasound Imaging using Microbubbles

Research output: Contribution to journalConference paperpeer-review

Original languageEnglish
JournalIEEE International Ultrasonics Symposium, IUS
DOIs
Published2021
Event2021 IEEE International Ultrasonics Symposium, IUS 2021 - Virtual, Online, China
Duration: 11 Sep 201116 Sep 2011

Bibliographical note

Publisher Copyright: © 2021 IEEE.

King's Authors

Abstract

Visualizing vasculature beyond the diffraction limit can be achieved using ultrasound super-resolution imaging. Typically, ultrasound scanners model the target medium as homogeneous, assuming a constant speed-of-sound for time-of-flight based calculations. However, variations in ultrasound propagation velocity caused by varying tissue layers affect beamforming operations. This aberration is likely to have considerable effect on super-resolution ultrasound imaging at depth. Here we investigate the effect of aberration on super-resolution ultrasound localization error in soft tissues using simulations. Wave propagation using both linear, B-Mode, and nonlinear, pulse inversion, (PI) imaging acquisition through different tissue media was modelled from a linear array using k-Wave, and the resulting pulse-echo data from a microbubble located at 50 mm depth was beamformed. Media included a control homogeneous propagation medium, and aberrating media typical of liver imaging. Results indicated super-resolution ultrasound localisation errors increased with increasing aberration and were affected by both the imaging method and microbubble sizes. Average localisation errors for PI reached 749m axially and 986m laterally and 844m axially and 734m laterally for B-mode. The scale of these errors relative to micro-vascular structures of interest suggests that aberration will have considerable impact on super-resolution ultrasound performance and requires attention to ensure its success.

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