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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 >Compensation of acoustic attenuation for high resolution photoacoustic imaging with line detectors
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Compensation of acoustic attenuation for high resolution photoacoustic imaging with line detectors

机译：使用线检测器补偿高分辨率光声成像的声衰减

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摘要

Photoacoustic imaging is based on the generation of acoustic waves in a semitransparent sample after illumination with short pulses of light or radio waves. The goal is to recover the spatial distribution of absorbed energy density inside the sample from acoustic pressure signals measured outside the sample (photoacoustic inverse problem). We have proposed a numerical method to calculate directly the time reversed field by retransmitting the measured pressure on the detection surface in reversed temporal order. This model-based time reversal method can solve the photoacoustic inverse problem exactly for an arbitrary closed detection surface. Recently we presented a set up which requires a single rotation axis and line detectors perpendicular to the rotation axis. Using a two-dimensional reconstruction method, such as time reversal in two dimensions, and applying the inverse two-dimensional radon transform afterwards gives an exact reconstruction of a three-dimensional sample with this set up. The resolution in photoacoustic imaging is limited by the acoustic bandwidth and therefore by acoustic attenuation, which can be substantial for high frequencies. This effect is usually ignored in reconstruction algorithms but has a strong impact on the resolution of small structures. It is demonstrated that the model based time reversal method allows to partly compensate this effect.
机译：光声成像基于半透明样品在短脉冲光或无线电波照射后产生的声波。目的是从样品外部测得的声压信号恢复样品内部吸收的能量密度的空间分布（光声反问题）。我们提出了一种数值方法，可以通过以逆时间顺序重新传输检测表面上的测得压力来直接计算时间逆场。这种基于模型的时间逆转方法可以精确地解决任意闭合检测面的光声逆问题。最近，我们提出了一个需要单个旋转轴和垂直于旋转轴的线检测器的设置。使用二维重建方法（例如二维时间反转），然后再应用逆二维radon变换，可以通过此设置对三维样本进行精确重建。光声成像的分辨率受到声带宽的限制，因此受到声衰减的限制，这对于高频而言可能是很重要的。这种影响通常在重建算法中被忽略，但是对小型结构的分辨率有很大影响。结果表明，基于模型的时间逆转方法可以部分补偿这种影响。

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