A broadband PA signal enhancement method with morphological frequency convolution for photoacoustic tomography

摘要

Photoacoustic Tomography (PAT) is a novel biomedical imaging modality, which is based on the photoacoustic effect induced by the instantaneous pulse laser excitation. The target emits photoacoustic (PA) signal upon the laser impulse excitation, which contains the information of light absorption of the target. To reconstruct a high-quality image of PAT, recovering the full bandwidth of the PA signal is necessary. While practical transducers cannot cover the full bandwidth of the PA signal, and has low sensitivity for ultralow frequency PA signal that induces the PA image distortion. In this study, a broadband PA signal enhancement method with morphological frequency convolution is proposed to recover PA signal. From the original reconstructed PA image frequency analyses, we get the convolution kernels and process the PA signal. The recovered full-bandwidth signal reconstructed the PA image with higher quality and less distortion.