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

Abstract

Photoacoustic Tomography (PAT) is a novel biomedical imaging modality, whose reconstructed image is based on the target responds of 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 induce 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 more realistic and with less distortion.