Abstract
In the inhomogeneous medium, acoustic scattering is always a fundamental challenge for photoacoustic imaging. We implement a correlation full-matrix filter (CFMF) combing with a time reversal operator to improve the imaging quality of acoustic sources in complex media. The correlation full-matrix filtering process extracts the direct wave component from the detected signal and preserve all the useful information at the same time. A location factor is considered in the time reversal operator to compensate for the image distortion and false contrast caused by the limited-view detection. The numerical simulations demonstrate that the proposed approach can perform good imaging quality with the higher image signal-noise ratio and better resolution in an acoustic scattering environment. This scheme might be applied to improve the photoacoustic imaging for inhomogeneous biological tissues.
Highlights
Probing or imaging an acoustic source in an acoustic scattering environment is a fundamental challenge in disordered systems theory[1,2,3,4] but highly desirable
The length of the time window ∆t is set to 5 μs, which promises that the direct waves within region of interest (ROI) are at the same time window[32]
We present a full-matrix filter based on the correlation of direct waves to overcome the obstacles of photoacoustic imaging in the inhomogeneous media
Summary
Probing or imaging an acoustic source in an acoustic scattering environment is a fundamental challenge in disordered systems theory[1,2,3,4] but highly desirable. Classical methods usually locate or image the acoustic sources by achieving coherent beamforming, which utilizes the deterministic signal phases in the direct wave component. Benefitting from this correlation filter, the imaging quality of acoustic sources is significantly improved.
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