期刊
PHYSICS IN MEDICINE AND BIOLOGY
卷 67, 期 13, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-6560/ac75a7
关键词
ultrasound; shear wave; artery; waveguide; dispersion
资金
- CTSA grant from the National Center for Advancing Translational Science (NCATS) [UL1TR002377]
- National Heart, Lung, and Blood Institute (NHLBI) [R01 HL145268]
- National Institutes of Health (NIH)
This study investigated the effects of the shape and location of the acoustic radiation force (ARF) beam on the measurements of arterial dispersion ultrasound vibrometry (ADUV). Experimental evaluations on an arterial phantom and in vivo validation showed that the shape of the beam controls the selection and nature of the induced modes, while the location affects the measured dispersion curves.
Objective. Arterial dispersion ultrasound vibrometry (ADUV) relies on the use of guided waves in arterial geometries for shear wave elastography measurements. Both the generation of waves through the use of acoustic radiation force (ARF) and the techniques employed to infer the speed of the resulting wave motion affect the spectral content and accuracy of the measurement. In particular, the effects of the shape and location of the ARF beam in ADUV have not been widely studied. In this work, we investigated how such variations of the ARF beam affect the induced motion and the measurements in the dispersive modes that are excited. Approach. The study includes an experimental evaluation on an arterial phantom and an in vivo validation of the observed trends, observing the two walls of the waveguide, simultaneously, when subjected to variations in the ARF beam extension (F/N) and focus location. Main results. Relying on the theory of guided waves in cylindrical shells, the shape of the beam controls the selection and nature of the induced modes, while the location affects the measured dispersion curves (i.e. variation of phase velocity with frequency or wavenumber, multiple modes) across the waveguide walls. Significance. This investigation is important to understand the spectral content variations in ADUV measurements and to maximize inversion accuracy by tuning the ARF beam settings in clinical applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据