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All-optical optoacoustic micro-tomography in reflection mode.

Tamar Harary1, Yoav Hazan1, Amir Rosenthal1

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Summary
This summary is machine-generated.

We developed a novel optoacoustic micro-tomography system for deep tissue imaging. This epi-illumination setup efficiently images structures up to 5mm deep, overcoming previous limitations.

Keywords:
Imaging techniquesMedical and biological imagingOptoacoustic tomographyPhotoacoustic imaging

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Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Acoustic Imaging

Background:

  • Conventional optoacoustic imaging requires focused ultrasound for deep imaging, limiting resolution.
  • Current tomographic approaches use unfocused detectors but demand full object illumination and trans-illumination, restricting them to thin samples.
  • Inefficient optical power usage and trans-illumination configurations hinder deep-tissue imaging applications.

Purpose of the Study:

  • To develop an optoacoustic micro-tomography system with an epi-illumination configuration for enhanced deep-tissue imaging.
  • To overcome the limitations of point-by-point scanning microscopy and trans-illumination tomography.
  • To enable high-resolution optoacoustic imaging beyond the optical diffusion limit.

Main Methods:

  • Developed an optoacoustic micro-tomography system utilizing an epi-illumination configuration.
  • Scanned both illumination and detector for imaging.
  • Validated the system using phantoms and in vivo mouse ear vasculature imaging.

Main Results:

  • Achieved high-resolution imaging at depths up to 5 mm in phantoms.
  • Successfully imaged the vasculature of a mouse ear in vivo.
  • Demonstrated that relaxed static illumination is feasible due to light diffusion in deep tissues.

Conclusions:

  • The developed optoacoustic micro-tomography system offers efficient, high-resolution deep-tissue imaging.
  • Epi-illumination with scanned illumination and detector overcomes limitations of previous methods.
  • The findings suggest practical feasibility for deep optoacoustic imaging applications.