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Non-interferometric photoacoustic remote sensing microscopy.

Parsin Hajireza1,2, Wei Shi1, Kevan Bell1

  • 1Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4 Canada.

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|September 1, 2018
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Summary
This summary is machine-generated.

Photoacoustic remote sensing microscopy uses light-induced sound waves to image subsurface structures without contact. This novel technique achieves high-resolution imaging of microvasculature and tumors.

Keywords:
all opticalmedical imagingoptical resolutionphotoacousticremote sensing

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Area of Science:

  • Biomedical Optics
  • Acousto-Optics
  • Microscopy

Background:

  • Photoacoustic imaging relies on light absorption and ultrasound generation.
  • Elasto-optical effects, or changes in refractive index due to stress, can influence light propagation.
  • Existing photoacoustic microscopy methods may be limited by contact requirements or sensitivity to surface phenomena.

Purpose of the Study:

  • To develop a non-contact photoacoustic microscopy technique.
  • To utilize elasto-optical modulation for signal generation.
  • To achieve high-resolution subsurface imaging.

Main Methods:

  • Developed photoacoustic remote sensing microscopy (PARSM).
  • Employed a non-interferometric, low-coherence probe beam confocal with a scanned excitation beam.
  • Leveraged elasto-optical refractive index modulation from photoacoustic transients for signal detection.

Main Results:

  • Demonstrated signal dependence on optical absorption, refractive index contrast, and excitation fluence.
  • Achieved ~2.7±0.5 μm lateral resolution in phantom studies.
  • Successfully imaged superficial microvasculature and melanoma tumors in vivo.

Conclusions:

  • Photoacoustic remote sensing microscopy is a viable non-contact imaging modality.
  • The elasto-optical effect provides a robust mechanism for photoacoustic signal detection.
  • PARSM offers high resolution for superficial tissue imaging.