Photoacoustic microscopy with 2-microm transverse resolution.

Area of Science:

• Biomedical Imaging
• Optical Microscopy
• Photoacoustics

Background:

• Photoacoustic microscopy (PAM) offers label-free imaging.
• High resolution is crucial for visualizing subcellular structures and cells.

Purpose of the Study:

• To develop and validate a new-generation optical-resolution confocal photoacoustic microscope.
• To achieve the highest transverse resolution among existing photoacoustic imaging systems.

Main Methods:

• Utilized a 0.25 numerical aperture optical microscope objective.
• Integrated a 75-MHz center-frequency spherically focused ultrasonic transducer.
• Employed optical-resolution confocal configuration.

Main Results:

• Achieved a transverse resolution of 2 micrometers, the highest reported for photoacoustic imaging.
• Demonstrated in situ imaging of mouse ears.
• Successfully resolved individual red blood cells in microvessels.

Conclusions:

• The developed photoacoustic microscope achieves record-breaking resolution.
• The system is capable of visualizing cellular structures in vivo.
• This technology holds significant potential for preclinical research and diagnostics.