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Inverse-scattering of absorptive samples via beam propagation.

Peter Wagenaar1, Jeongsoo Kim1, Mary E Swartz2

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Summary
This summary is machine-generated.

This study introduces a new method for label-free 3D imaging, reconstructing both refractive index and absorptivity of biological tissues. This advances quantitative imaging for complex, light-scattering, and absorbing biological samples.

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Area of Science:

  • Biophotonics
  • Computational Imaging
  • Optical Microscopy

Background:

  • Label-free imaging offers intrinsic contrast without exogenous labels.
  • Existing inverse-scattering methods primarily reconstruct refractive index (RI) for non-absorptive samples.
  • Biological tissues exhibit both scattering and absorption, posing challenges for current methods.

Purpose of the Study:

  • To extend the multi-slice beam propagation (MSBP) framework for complex-valued RI reconstruction.
  • To incorporate both refractive index (real part) and absorptivity (imaginary part) in 3D imaging.
  • To enable accurate label-free volumetric imaging of absorptive biological tissues.

Main Methods:

  • Developed an extended MSBP inverse-scattering framework.
  • Incorporated measurement diversity using angle-varying illumination and sample defocus.
  • Validated the method on dyed microspheres and diverse absorptive scattering biological samples.

Main Results:

  • Successfully reconstructed complex-valued RI, including absorptivity, in scattering samples.
  • Demonstrated that angle-varying illumination alone is insufficient for stable reconstruction.
  • Showcased the biological utility of the method for absorptive tissues.

Conclusions:

  • Reconstructing complex-valued RI requires diverse measurements from both illumination angles and defocus.
  • This extended framework advances label-free quantitative 3D imaging of biological tissues.
  • The method provides intrinsic morphological contrast for scattering and absorbing samples.