Photoacoustic imaging using an adaptive interferometer with a photorefractive crystal

Area of Science:

• Biomedical Optics
• Acoustic Imaging
• Interferometry

Background:

• Traditional photoacoustic imaging often requires coupling agents for effective ultrasound transmission.
• Limitations exist in imaging rough surfaces and achieving remote measurements.

Purpose of the Study:

• To develop a remote, coupling-agent-free 3D photoacoustic imaging technique.
• To demonstrate the capability of measuring ultrasonic displacements on rough surfaces.

Main Methods:

• Utilized a two-wave mixing interferometer (TWMI) with a photorefractive crystal (PRC).
• Employed Fourier domain synthetic aperture focusing technique (FSAFT) for image reconstruction.
• Performed measurements on phantoms, biological samples, and a human forearm in-vivo.

Main Results:

• Achieved remote 3D photoacoustic imaging without coupling agents.
• Successfully imaged ultrasonic displacements on rough sample surfaces.
• Demonstrated the technique's versatility on various samples, including in-vivo human forearm.

Conclusions:

• The TWMI-based photoacoustic imaging system offers a promising alternative for non-contact 3D imaging.
• This method overcomes limitations of traditional techniques, enabling imaging in challenging scenarios.
• The technology shows potential for various biomedical and material science applications.