首页> 外文会议>Photons Plus Ultrasound: Imaging and Sensing 2005; Progress in Biomedical Optics and Imaging; vol.6, no.12 >Investigation of the photorefractive crystal based detection system for acousto-optical imaging (AOI) in highly diffuse media
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Investigation of the photorefractive crystal based detection system for acousto-optical imaging (AOI) in highly diffuse media

机译:基于光折射晶体的高扩散介质中声光成像(AOI)检测系统的研究

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Acousto-optical imaging (AOI) in diffuse media is a hybrid technique that is based on the interaction of multiply scattered laser light with a focused ultrasound beam. A phase-modulated optical field emanates from the interaction region and carries with it information about the local opto-mechanical properties of the insonated media. The goal of AOI is to reveal the optically relevant physiological information while maintaining ultrasonic resolution. Among the state-of-the-art optical detection techniques used for AOI, there is a trade-off between the axial resolution (or ultrasound bandwidth) and the signal-to-noise ratio (SNR). In this paper, a photorefractive-crystal (PRC) based interferometry system is employed to detect acousto-optical (AO) signals in highly diffuse media. This system allows for the use of short pulses of focused ultrasound and is capable of imaging mm-scale inhomogeneities imbedded inside tissue-mimicking phantoms. One-dimensional (1-D) AO image along the transducer axis is obtained from a single, time-averaged time-domain acousto-optical signal, and the axial resolution is determined by the acoustic spatial pulse length, rather than the longer axial dimension of the ultrasonic focal region (as is the case when using a continuous-wave (CW) ultrasound source). Two-dimensional (2-D) images can be constructed by scanning the transducer in one dimension, which results in a reduction in imaging acquisition time and makes fast acousto-optical imaging possible.
机译:扩散介质中的声光成像(AOI)是一种混合技术,该技术基于多重散射的激光与聚焦超声束的相互作用。相位调制的光场从相互作用区域发出,并带有有关声波介质的局部光机械特性的信息。 AOI的目的是在保持超声分辨率的同时揭示光学相关的生理信息。在用于AOI的最新光学检测技术中,需要在轴向分辨率(或超声带宽)和信噪比(SNR)之间进行权衡。在本文中,基于光折射晶体(PRC)的干涉测量系统用于检测高扩散介质中的声光(AO)信号。该系统允许使用聚焦超声的短脉冲,并能够对嵌入组织模拟体模内的毫米级不均匀性进行成像。沿换能器轴的一维(1-D)AO图像是从单个时平均时域声光信号获得的,而轴向分辨率是由声学空间脉冲长度而不是较长的轴向尺寸确定的超声聚焦区域的变化(如使用连续波(CW)超声源时的情况)。可以通过一维扫描换能器来构建二维(2-D)图像,这可以减少成像获取时间,并可以进行快速声光成像。

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