High-speed wide-field multi-parametric photoacoustic microscopy.

Area of Science:

• Biomedical Optics
• Microscopy
• Physiology

Background:

• Multi-parametric photoacoustic microscopy (PAM) is vital for studying microvascular hemodynamics and metabolism.
• Current PAM systems face limitations in scanning speed, hindering the study of rapid physiological responses.

Purpose of the Study:

• To develop a novel multi-parametric PAM system with significantly improved scanning speed.
• To enable high-resolution, real-time imaging of blood perfusion, oxygenation, and flow.

Main Methods:

• Utilized a cylindrically focused ultrasonic transducer to extend the optical scanning range.
• Achieved simultaneous acquisition of 500 B-scans for accelerated data capture.
• Developed a system capable of imaging over a 4.5x1 mm² area at 1 Hz frame rate.

Main Results:

• The new PAM system is 112 times faster than previous designs.
• Demonstrated feasibility in imaging the microvasculature of a living mouse ear.
• Achieved simultaneous, high-resolution imaging of blood perfusion, oxygenation, and flow.

Conclusions:

• The developed multi-parametric PAM system overcomes speed limitations for microvascular studies.
• Future development in reflection mode could allow real-time cortex-wide brain imaging.
• This technology offers a powerful tool for investigating rapid hemodynamic and metabolic changes.