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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 >Speed-of-sound imaging in a photoacoustic imager
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Speed-of-sound imaging in a photoacoustic imager

机译：光声成像仪中的声速成像

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摘要

The effects of an inappropriately chosen speed-of-sound in photoacoustic imaging reconstructions are to cause blurring of images and impairment of contrast. Here we outline a new methodology to measure the speed-of-sound in a photoacoustic imager with little or no additional cost and without the need to perform extra measurements. The method uses a strong absorber of light which is placed in the path of the light illuminating the sample. This acts as a source of ultrasound whose interaction with the sample can be measured at the far-end of the sample using the same ultrasound detector used for photoacoustics. This yields time-of-arrival measurements of the ultrasound transient at the multi-element detector. Such measurements are made at various angles around the sample in a computerized tomography approach. Reconstruction of the time-of-arrival or speed-of-sound tomogram of the object can be made by implementing a fan-beam projection reconstruction algorithm. We present the concept and validate the method on a speed-of-sound phantom.
机译：光声成像重建中音速选择不当的影响将导致图像模糊和对比度下降。在这里，我们概述了一种新的方法来测量光声成像仪中的音速，而几乎不需要或不需要额外的成本，而无需执行额外的测量。该方法使用强光吸收剂，该吸收剂置于照亮样品的光的路径中。这充当超声源，可以使用与光声相同的超声检测器在样品的远端测量与样品的相互作用。这样就可以在多元素检测器上获得超声瞬变的到达时间测量值。在计算机断层摄影方法中，以围绕样品的各种角度进行此类测量。可以通过实现扇形束投影重建算法来重建对象的到达时间或声速断层图。我们提出了这一概念，并在音速体模上验证了该方法。

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