Shear wave focusing for three-dimensional sonoelastography.
Shear wave focusing for three-dimensional sonoelastography.
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DOI：
10.1121/1.1419093
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发表时间：
2002-01
期刊：
影响因子：
--
通讯作者：
Zhe Wu;L. S. Taylor;D. Rubens;K. Parker
中科院分区：
文献类型：
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作者：
Zhe Wu;L. S. Taylor;D. Rubens;K. Parker
一个新的振动计划，以提供局部振动场的三维声弹性成像。计算了垂直于半无限弹性空间表面振动的双条形载荷的理论振动分布。预测了剪切波在双条带载荷之间的局部化或聚焦。在实验上，两个平行的刚性矩形截面杆安装在电磁振荡器。在信号源的驱动下，杆在仿组织体模的表面上振动。双杆源也用于将剪切波传播到具有6 mm“肿瘤”的离体前列腺体模中。高频（400-600 Hz）的组合用于驱动双杆施加器。在体模实验中，证实了理论预测的具有更高振幅和均匀性的剪切波聚焦区。如理论所示，当调节棒的间隔时，聚焦区的位置是可控的。将该振动方案应用于前列腺体模实验，获得了边界清晰的高分辨率肿瘤图像。平行杆是在可控局部体积内产生更均匀振动的理想施加器。场具有均匀性，特别是在沿着条的方向上。
A new vibration scheme is shown to provide localized vibration fields for three-dimensional sonoelastography imaging. The theoretical vibration distributions of double strip loads vibrating normally to the surface of a semi-infinite elastic space are calculated. A localization or focusing of shear waves inbetween the double-strip loads is predicted. Experimentally, two parallel rigid rectangular cross-section bars are mounted on an electromagnetic shaker. Driven by the signal source, the bars vibrate against the surface of a tissue-mimicking phantom. The double-bar source is also used to propagate shear wave into an ex vivo prostate phantom with a 6 mm "tumor" in it. A combination of high frequencies (400-600 Hz) is used to drive the double-bar applicator. In the phantom experiments, a shear wave focal zone with higher vibration amplitude and uniformity predicted by the theory was confirmed. The position of the focal zone is controllable when adjusting the separation of the bars as the theory shows. When this vibration scheme was used in a prostate phantom experiment, high-resolution tumor images with clear boundaries are obtained. The parallel bar is an ideal applicator to create more uniform vibration within a controllable localized volume. The field has uniformity especially in the direction along the bars.