Full-frequency correction of spatial impulse response in back-projection scheme using space-variant filtering for...

Area of Science:

• Biomedical optics
• Medical imaging
• Acoustic imaging

Background:

• Optoacoustic mesoscopy (OPAM) image quality relies on accurate reconstruction.
• Incorporating the spatial impulse response (SIR) of transducers improves fidelity but is computationally intensive.
• Existing methods struggle with the large datasets and time demands of high-resolution OPAM.

Purpose of the Study:

• To develop an efficient reconstruction method for OPAM that fully accounts for the spatial impulse response (SIR).
• To improve image fidelity, resolution, and contrast in OPAM while managing large datasets and reducing computational time.

Main Methods:

• A modified back-projection algorithm incorporating a space-variant filter for full-frequency correction of the SIR was developed.
• The method was applied to an OPAM system utilizing a sphere-focused transducer.
• Simulations and experimental data from phantoms and biological tissues were used for validation.

Main Results:

• The modified back-projection method effectively managed large OPAM datasets and reduced processing time.
• Simulations and experiments demonstrated superior image fidelity, resolution, and contrast compared to traditional methods.
• The proposed method achieved full-frequency correction of the SIR.

Conclusions:

• The modified back-projection method offers a computationally efficient solution for high-resolution OPAM image reconstruction.
• This approach significantly enhances image quality by accurately incorporating the spatial impulse response.
• The method shows promise for improved diagnostic capabilities in OPAM applications.