Fourier transform acousto-optic imaging with off-axis holographic detection

Area of Science:

• Biomedical Optics
• Medical Imaging
• Acousto-Optics

Background:

• Acousto-optic (AO) imaging offers in-depth visualization of scattering media.
• In vivo imaging of biological tissues is challenging due to speckle decorrelation on millisecond timescales.
• Camera-based detection requires integration times below these decorrelation scales.

Purpose of the Study:

• To develop a novel 2D acousto-optic imaging system compatible with in vivo imaging.
• To address the limitations of speckle decorrelation in scattering biological tissues.
• To demonstrate a robust method for deep tissue imaging.

Main Methods:

• Fourier transform acousto-optic imaging combined with off-axis holography.
• Utilized plane waves and long-duration pulses for enhanced signal acquisition.
• Employed camera-based detection with integration times suitable for in vivo conditions.

Main Results:

• Demonstrated a 2D imaging system meeting in vivo imaging prerequisites for the first time.
• Successfully performed in-depth imaging within a multiple scattering sample.
• Validated the compatibility of the system with biological tissue imaging challenges.

Conclusions:

• The developed Fourier transform acousto-optic imaging system is suitable for in vivo applications.
• This technique overcomes key limitations of current AO imaging for biological tissues.
• The system represents a significant advancement for deep tissue optical imaging.