• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Ultrasonic Synthetic-Aperture Interface Imaging
【24h】

Ultrasonic Synthetic-Aperture Interface Imaging

机译：超声波合成孔径界面成像

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Synthetic-aperture (SA) imaging is a popular method to visualize the reflectivity of an object from ultrasonic reflections. The method yields an image of the (volume) contrast in acoustic impedance with respect to the embedding. Typically, constant mass density is assumed in the underlying derivation. Due to the band-limited nature of the recorded data, the image is blurred in space, which is quantified by the associated point spread function. SA volume imaging is valid under the Born approximation, where it is assumed that the contrast is weak. When objects are large with respect to the wavelength, it is questionable whether SA volume imaging should be the method-of-choice. Herein, we propose an alternative solution that we refer to as SA interface imaging. This approach yields a vector image of the discontinuities of acoustic impedance at the tissue interfaces. Constant wave speed is assumed in the underlying derivation. The image is blurred in space by a tensor, which we refer to as the interface spread function. SA interface imaging is valid under the Kirchhoff approximation, where it is assumed that the wavelength is small compared to the spatial dimensions of the interfaces. We compare the performance of volume and interface imaging on synthetic data and on experimental data of a gelatin cylinder with a radius of 75 wavelengths, submerged in water. As expected, the interface image peaks at the gelatin-water interface, while the volume image exposes a peak and trough on opposing sides of the interface.
机译：合成孔径（SA）成像是一种流行的方法，可以从超声波反射中观察物体的反射率。该方法产生关于嵌入的声阻抗的（体积）对比度的图像。通常，在基础推导中假设质量密度恒定。由于所记录数据的带宽限制，图像在空间上模糊不清，这由关联的点扩展函数来量化。 SA体积成像在Born近似下有效，其中假定对比度较弱。当物体相对于波长较大时，是否应该选择SA体积成像是一个问题。在这里，我们提出了一种替代解决方案，称为SA界面成像。该方法产生组织界面处声阻抗不连续的矢量图像。在基础推导中假设恒定波速。张量将图像在空间上模糊，我们将其称为界面扩展函数。在基尔霍夫近似下，SA界面成像是有效的，其中假设波长比界面的空间尺寸小。我们比较了体积和界面成像对合成数据和半径为75个波长的明胶圆柱体的实验数据的性能，该明胶圆柱体浸没在水中。如所预期的，界面图像在明胶-水界面处达到峰值，而体积图像在界面的相对侧暴露出峰和谷。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号