Two-sided residual refocusing for an acoustic lens-based photoacoustic imaging system.
Two-sided residual refocusing for an acoustic lens-based photoacoustic imaging system.
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DOI：
10.1088/1361-6560/aac8c5
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发表时间：
2018-07-02
影响因子：
3.5
通讯作者：
Rao N
中科院分区：
文献类型：
--
作者：
Francis KJ;Chinni B;Channappayya SS;Pachamuthu R;Dogra VS;Rao N
在光声（PA）相机中，基于声学透镜的系统可以形成物平面的聚焦图像。实时C扫描PA图像可以通过简单地时间选通换能器响应来形成。虽然大部分聚焦动作是由透镜完成的，但是需要残余重聚焦来同时以高分辨率对多个深度进行成像。然而，PA相机的重聚焦算法还没有研究到目前为止，在文献中。在这项工作中，我们将PA相机的残余重聚焦问题重新表述为平面传感器阵列的双边波传播。问题的一部分涉及前向波传播，而另一部分涉及时间反演。我们选择了一个快速傅立叶变换（FFT）为基础的波传播模型的重新聚焦，以保持系统的实时性。我们已经在多个深度进行了点扩展函数（PSF）测量实验，并使用所提出的方法重新聚焦信号。分析了重聚焦后点扩展函数的半高宽、峰值和信噪比，量化了重聚焦对点扩展函数的影响。我们相信，使用二维换能器阵列结合所提出的重新聚焦，可以导致实时体积成像使用PA相机。
In Photoacoustic (PA) cameras, an acoustic lens-based system can form a focused image of an object plane. A real-time C-scan PA image can be formed by simply time gating the transducer response. While most of the focusing action is done by the lens, residual refocusing is needed to image multiple depths with high resolution simultaneously. However, a refocusing algorithm for PA camera has not been studied so far in the literature. In this work, we reformulate this residual refocusing problem for a PA camera into a two-sided wave propagation from a planar sensor array. One part of the problem deals with forward wave propagation while the other deals with time reversal. We have chosen a Fast Fourier Transform (FFT) based wave propagation model for the refocusing to maintain the real-time nature of the system. We have conducted Point Spread Function (PSF) measurement experiments at multiple depths and refocused the signal using the proposed method. Full Width at Half Maximum (FWHM), peak value and Signal to Noise Ratio (SNR) of the refocused PSF is analyzed to quantify the effect of refocusing. We believe that using a two-dimensional transducer array combined with the proposed refocusing, can lead to real-time volumetric imaging using a PA camera.
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影响因子：
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作者：
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通讯作者：
Wan, Wei
影响因子：
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