Microwave-induced thermoacoustic tomography: reconstruction by synthetic aperture.
Microwave-induced thermoacoustic tomography: reconstruction by synthetic aperture.
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DOI：
10.1118/1.1418015
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发表时间：
2001-12
期刊：
影响因子：
3.8
通讯作者：
Dazi Feng;Yuan Xu;G. Ku;Lihong V. Wang
中科院分区：
文献类型：
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作者：
Dazi Feng;Yuan Xu;G. Ku;Lihong V. Wang
我们已经应用合成孔径方法的线性扫描微波诱导热声成像在生物组织。采用非聚焦超声换能器接收热声信号，采用延迟求和算法进行图像重建。我们大大提高了图像的横向分辨率，并获得了清晰的视图的圆形边界的掩埋圆柱形物体，这不能得到传统的线性扫描微波热声层析成像的基础上聚焦换能器。两个微波源，其频率分别为9和3 GHz，分别用于实验中进行比较。在近地表成像中，3 GHz系统具有比9 GHz系统大得多的成像深度，但信噪比较低。
We have applied the synthetic-aperture method to linear-scanning microwave-induced thermoacoustic tomography in biological tissues. A nonfocused ultrasonic transducer was used to receive thermoacoustic signals, to which the delay-and-sum algorithm was applied for image reconstruction. We greatly improved the lateral resolution of images and acquired a clear view of the circular boundaries of buried cylindrical objects, which could not be obtained in conventional linear-scanning microwave-induced thermoacoustic tomography based on focused transducers. Two microwave sources, which had frequencies of 9 and 3 GHz, respectively, were used in the experiments for comparison. The 3 GHz system had a much larger imaging depth but a lower signal-noise ratio than the 9 GHz system in near-surface imaging.