Improved optoacoustic microscopy through three-dimensional spatial impulse response synthetic aperture focusing...

Area of Science:

• Medical imaging
• Acoustics
• Optoacoustic microscopy

Background:

• Synthetic aperture focusing technique (SAFT) improves ultrasonic image resolution.
• Standard SAFT requires modifications for optoacoustic imaging due to its unique physical properties.
• Existing methods struggle with focusing-related distortions in optoacoustic scans.

Purpose of the Study:

• To develop and validate a modified SAFT algorithm for scanning optoacoustic microscopy.
• To enhance lateral resolution and signal gain for out-of-focus optoacoustic sources.
• To implement a 3D algorithm applicable to signals at and far from the detector focus.

Main Methods:

• Developed the Spatial Impulse Response-SAFT (SIR-SAFT) algorithm.
• Incorporated the transducer's spatial impulse response (SIR) to weight SAFT contributions.
• Implemented the SIR-SAFT method in full three dimensions.
• Validated the algorithm using simulated and experimental optoacoustic data.

Main Results:

• The SIR-SAFT method significantly improves resolution and signal gains for out-of-focus optoacoustic sources.
• The 3D implementation is effective for signals across various distances from the detector focus.
• SIR-SAFT demonstrated superior performance compared to conventional SAFT algorithms.
• Both simulated and experimental data confirmed the algorithm's effectiveness.

Conclusions:

• SIR-SAFT is a robust and effective algorithm for enhancing scanning optoacoustic microscopy.
• The method addresses limitations of conventional SAFT in optoacoustic modalities.
• SIR-SAFT offers significant advancements in image quality for optoacoustic imaging.