Department of Electronics and Communication, Visvesvaraya National Institute of Technology, Nagpur, India.
Department of Imaging Science, University of Rochester Medical Center, Rochester, NY, USA.
Ultrason Imaging. 2021 Jan;43(1):46-56. doi: 10.1177/0161734620977838.
Photoacoustic signal recorded by photoacoustic imaging system can be modeled as convolution of initial photoacoustic response by the photoacoustic absorber with the system impulse response. Our goal was to compute the size of photoacoustic absorber using the initial photoacoustic response, deconvolved from the recorded photoacoustic data. For deconvolution, we proposed to use the impulse response of the photoacoustic system, estimated using discrete wavelet transform based homomorphic filtering. The proposed method was implemented on experimentally acquired photoacoustic data generated by different phantoms and also verified by a simulation study involving photoacoustic targets, identical to the phantoms in experimental study. The photoacoustic system impulse response, which was estimated using the acquired photoacoustic signal corresponding to a lead pencil, was used to extract initial photoacoustic response corresponding to a mustard seed of 0.65 mm radius. The recovered radius values of the mustard seed, corresponding to the experimental and simulation studies were 0.6 mm and 0.7 mm.
光声成象系统记录的光声信号可以建模为光声吸收体的初始光声响应与系统脉冲响应的卷积。我们的目标是使用从记录的光声数据中反卷积的初始光声响应来计算光声吸收体的大小。为了进行反卷积，我们提出使用基于离散小波变换的同态滤波估计的光声系统脉冲响应。该方法在不同的仿体产生的实验获得的光声数据上进行了实现，并且通过涉及与实验研究中相同的光声目标的模拟研究进行了验证。使用对应于一支铅笔的采集的光声信号来估计光声系统脉冲响应，并使用它来提取对应于半径为 0.65mm 的芥菜种子的初始光声响应。实验和模拟研究中芥菜种子的恢复半径值分别为 0.6mm 和 0.7mm。
