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Iterative time-reversed ultrasonically encoded light focusing in backscattering mode.

Haowen Ruan1, Mooseok Jang1, Benjamin Judkewitz2

  • 1Electrical Engineering, California Institute of Technology, 1200 E California Boulevard, Pasadena, California, 91125, USA.

Scientific Reports
|November 22, 2014
PubMed
Summary

Iterative Time-Reversed Ultrasound-Encoded (iTRUE) light focusing enhances signal intensity and resolution for noninvasive deep tissue imaging. This novel technique improves light focusing in challenging backscattering geometries for biomedical applications.

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Area of Science:

  • Biomedical Optics
  • Acousto-Optics
  • Noninvasive Imaging

Background:

  • Time-Reversed Ultrasound-Encoded (TRUE) light enables deep light focusing in scattering media.
  • TRUE light suffers from low signal-to-noise ratio and limited resolution, especially in backscattering mode.
  • Backscattering geometry is crucial for practical biomedical applications.

Purpose of the Study:

  • To develop an iterative TRUE (iTRUE) light focusing technique.
  • To enhance light intensity and resolution of TRUE focus.
  • To enable TRUE light focusing in backscattering mode.

Main Methods:

  • Developed an iterative TRUE (iTRUE) technique using the TRUE focus as a signal source.
  • Demonstrated iTRUE focusing in a backscattering configuration between scattering layers.
  • Scanned a fluorescent bead to assess focusing resolution.
  • Applied iTRUE to biological samples (chicken tissue and cartilage).

Main Results:

  • Achieved progressive light intensity enhancement by approximately 20-fold at the focus.
  • Improved focusing resolution ~2-fold axially and ~3-fold laterally.
  • Observed similar intensity enhancements in biological tissue samples.

Conclusions:

  • The iterative TRUE (iTRUE) technique significantly enhances light intensity and resolution for noninvasive focusing.
  • iTRUE is effective in backscattering mode, overcoming limitations of conventional TRUE light.
  • This advancement holds promise for improved deep tissue imaging in biomedical applications.