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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Implementation of a phase array diffuse optical tomographic imager.

K Rajan1, V Vijayakumar, Samir Kumar Biswas

  • 1Department of Physics, Indian Institute of Science, Bangalore 560012, India. rajan@physics.iisc.ernet.in

The Review of Scientific Instruments
|December 3, 2008
PubMed
Summary
This summary is machine-generated.

This study demonstrates a phase array system for diffuse optical tomography (DOT) to detect small tissue inhomogeneities. The system successfully identifies multiple inhomogeneities as small as 4 mm, offering a promising tool for noninvasive medical imaging.

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Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Photonics

Background:

  • Diffuse optical tomography (DOT) uses near-infrared (NIR) light for noninvasive deep tissue imaging.
  • Quantitative reconstruction of absorption coefficient variations aids in diagnosing metabolic and disease states.
  • Accurate spatial resolution and precision are crucial for medical imaging modalities like DOT.

Purpose of the Study:

  • To evaluate the performance of a phase array system for detecting optical inhomogeneities in tissue.
  • To investigate the capability of detecting and locating small objects in turbid media using amplitude cancellation with dual out-of-phase sources.

Main Methods:

  • Light transport modeled using the diffusion equation, solved via the finite element method for the forward problem.
  • Model-based iterative image reconstruction employed to solve the inverse problem.
  • Amplitude cancellation method with a phase array system utilizing high-frequency (100 MHz) modulated dual out-of-phase laser sources.

Main Results:

  • Simulation studies showed the phase array system can resolve 5 mm inhomogeneities with twice the background absorption coefficient.
  • Experimental validation using a prototype dual-source system detected multiple inhomogeneities as small as 4 mm in a tumor-simulating phantom.
  • Localization error for a 5 mm inhomogeneity was found to be approximately 1 mm.

Conclusions:

  • The phase array system effectively detects and localizes small optical inhomogeneities in turbid media.
  • This technique shows promise for noninvasive diagnosis and monitoring of tissue's metabolic and disease states.
  • The developed prototype validates the potential of dual-source DOT for high-resolution imaging of deep tissue.