Local Phase Velocity Based Imaging: A New Technique Used for Ultrasound Shear Wave Elastography.
Local Phase Velocity Based Imaging: A New Technique Used for Ultrasound Shear Wave Elastography.
复制标题
基于局部相速度的成像：超声剪切波弹性成像的新技术。
DOI：
10.1109/tmi.2018.2874545
复制
发表时间：
2019-04
影响因子：
10.6
通讯作者：
Urban MW
中科院分区：
文献类型：
--
作者：
Kijanka P;Urban MW
Ultrasound shear wave elastography is an imaging modality for noninvasive evaluation of tissue mechanical properties. However, many current techniques overestimate a lesion’s dimension or shape especially when small inclusions are taken into account. In this study we propose a new method called local phase velocity based imaging (LPVI) as an alternative technique to measure tissue elasticity. Two separate acquisitions with ultrasound push beams focused once on the left side and once on the right side of the inclusion were generated. A local shear wave velocity is then recovered in the frequency domain (for a single frequency or frequency band) for both acquired data sets. Finally, a two-dimensional shear wave velocity map is reconstructed by combining maps from two separate acquisitions. Robust and accurate shear wave velocity maps are reconstructed using the proposed LPVI method in calibrated liver fibrosis tissue mimicking homogeneous phantoms, a calibrated elastography phantom with stepped cylinder inclusions and a homemade gelatin phantom with ex vivo porcine liver inclusion. Results are compared with an existing phase velocity based imaging approach and a group velocity based method considered as the state-of-the-art. Results from the phantom study showed that increased frequency improved the shape of the reconstructed inclusions and contrast-to-noise ratio between the target and background.
