On diffusive scaling in acousto-optic imaging

Francis J. Chung, Ru Yu Lai, Qin Li

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Acousto-optic imaging (AOI) is a hybrid imaging process. By perturbing the to-be-reconstructed tissues with acoustic waves, one introduces the interaction between the acoustic and optical waves, leading to a more stable reconstruction of the optical properties. The mathematical model was described in [27], with the radiative transfer equation serving as the forward model for the optical transport. In this paper we investigate the stability of the reconstruction. In particular, we are interested in how the stability depends on the Knudsen number, Kn, a quantity that measures the intensity of the scattering effect of photon particles in a media. Our analysis shows that as Kn decreases to zero, photons scatter more frequently, and since information is lost, the reconstruction becomes harder. To counter this effect, devices need to be constructed so that laser beam is highly concentrated. We will give a quantitative error bound, and explicitly show that such concentration has an exponential dependence on Kn. Numerical evidence will be provided to verify the proof.

Original languageEnglish
Article number085011
JournalInverse Problems
Issue number8
StatePublished - Aug 2020

Bibliographical note

Publisher Copyright:
© 2020 IOP Publishing Ltd.


  • Knudsen number
  • acousto-optic imaging
  • radiative transfer equation

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Signal Processing
  • Mathematical Physics
  • Computer Science Applications
  • Applied Mathematics


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