Influence of |ω|-filter on photoacoustic imaging

Photoacoustic tomography is a potential and noninvasive medical imaging technology. It combines the advantages of pure optic imaging and pure ultrasound imaging. We have explored photoacoustic imaging with different filters, such as RL, SL, Modi-SL and Kwoh-Reed, which take important roles on reconstructed images. The results of simulations and experiments show that the filter of Kwoh-Reed can restrain noise effectively and improve the contrast of images compares with the filters of RL. SL, Modi-SL in the presence of strong noise. A Q-switched Nd:YAG laser operating at 532nm was used as light source. The laser had a pulse width of 7ns and a repetition frequency of 30Hz. A needle PVDF hydrophone with dianieter of 1 mm was used to detect photoacoustic signals.