Fast voice-coil scanning optical-resolution photoacoustic microscopy

Area of Science:

• Biomedical Engineering
• Optical Imaging
• Microscopy

Background:

• Photoacoustic imaging combines optical absorption contrast with ultrasound detection.
• High-resolution, real-time imaging is crucial for observing dynamic biological processes.
• Existing systems often face limitations in speed or resolution.

Purpose of the Study:

• To develop a photoacoustic imaging system with real-time capability and optical resolution.
• To achieve high scanning speeds and fine lateral resolution for in vivo imaging.
• To demonstrate the system's ability to visualize dynamic microvasculature and cellular components.

Main Methods:

• Development of a novel photoacoustic imaging system utilizing a focused laser beam.
• Implementation of real-time scanning capabilities at 20 Hz (9 mm range) and 40 Hz (1 mm range).
• Characterization of lateral resolution (3.4 microm) in a non-scattering medium.

Main Results:

• Achieved real-time imaging with optical resolution.
• Demonstrated high scanning speeds suitable for dynamic processes.
• Successfully imaged micrometer-sized particles, whole blood flow, and individual red blood cells (RBCs) in vivo.
• Achieved a lateral resolution of 3.4 microm.

Conclusions:

• The developed photoacoustic imaging system provides unprecedented real-time, micrometer-scale resolution.
• The system is capable of imaging highly dynamic biological processes in vivo.
• This technology holds significant potential for preclinical research and diagnostics.