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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Thermoacoustic tomography with integrating area and line detectors
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Thermoacoustic tomography with integrating area and line detectors

机译：集成区域和线检测器的热声层析成像

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摘要

Thermoacoustic (optoacoustic, photoacoustic) tomography is based on the generation of acoustic waves by illumination of a sample with a short electromagnetic pulse. The absorption density inside the sample is reconstructed from the acoustic pressure measured outside the illuminated sample. So far measurement data have been collected with small detectors as approximations of point detectors. Here, a novel measurement setup applying integrating detectors (e.g., lines or planes made of piezoelectric films) is presented. That way, the pressure is integrated along one or two dimensions, enabling the use of numerically efficient algorithms, such as algorithms for the inverse radon transformation, for thermoacoustic tomography. To reconstruct a three-dimensional sample, either an area detector has to be moved tangential around a sphere that encloses the sample or an array of line detectors is rotated around a single axis. The line detectors can be focused on cross sections perpendicular to the rotation axis using a synthetic aperture (SAFT) or by scanning with a cylindrical lens detector. Measurements were made with piezoelectric polyvinylidene fluoride film detectors and evaluated by comparison with numerical simulations. The resolution achieved in the resulting tomography images is demonstrated on the example of the reconstructed cross section of a grape.
机译：热声（光声，光声）断层扫描基于通过短电磁脉冲照射样品产生的声波。样品内部的吸收密度是根据被照射样品外部测得的声压重建的。到目前为止，已经使用小型检测器收集了测量数据作为点检测器的近似值。这里，提出了一种应用积分检测器（例如，由压电膜制成的线或平面）的新颖的测量装置。这样，压力沿一维或二维积分，从而可以将数值有效的算法（例如逆ra变换算法）用于热声层析成像。为了重建三维样本，要么必须将区域检测器沿包围样本的球体切向移动，要么要使线检测器阵列绕单个轴旋转。可以使用合成孔径（SAFT）或通过使用柱面透镜检测器进行扫描，将线检测器聚焦在垂直于旋转轴的横截面上。用压电聚偏二氟乙烯薄膜检测器进行测量，并与数值模拟进行比较进行评估。在重建的断层图像中获得的分辨率在葡萄的横截面示例中得到了证明。

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