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首页> 外文会议>Photons Plus Ultrasound: Imaging and Sensing 2007; Progress in Biomedical Optics and Imaging; vol.8 no.14; Proceedings of SPIE-The International Society for Optical Engineering; vol.6437 >Imaging of optically diffusive media by use of opto-elastography
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Imaging of optically diffusive media by use of opto-elastography

机译：使用光弹性成像对光学扩散介质成像

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摘要

We present a camera-based optical detection scheme designed to detect the transient motion created by the acoustic radiation force in elastic media. An optically diffusive tissue mimicking phantom was illuminated with coherent laser light, and a high speed camera (2 kHz frame rate) was used to acquire and cross-correlate consecutive speckle patterns. Time-resolved transient decorrelations of the optical speckle were measured as the results of localised motion induced in the medium by the radiation force and subsequent propagating shear waves. As opposed to classical acousto-optic techniques which are sensitive to vibrations induced by compressional waves at ultrasonic frequencies, the proposed technique is sensitive only to the low frequency transient motion induced in the medium by the radiation force. It therefore provides a way to assess both optical and shear mechanical properties.
机译：我们提出了一种基于相机的光学检测方案，该方案旨在检测由弹性介质中的声辐射力产生的瞬态运动。用相干激光照射模仿幻像的光学扩散组织，并使用高速相机（2 kHz帧频）获取并交叉关联连续的斑点图案。测量了光斑的时间分辨瞬态解相关，作为由辐射力和随后传播的剪切波在介质中引起的局部运动的结果。与经典的声光技术相反，经典的声光技术对超声频率上的压缩波引起的振动敏感，而提出的技术仅对辐射力在介质中引起的低频瞬态运动敏感。因此，它提供了一种评估光学和剪切机械性能的方法。

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