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Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope
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Imaging cells and nanoparticles using modulated optically computed phase microscopy.

Xuan Liu1, Rupak Bhakta2, Emily Kryvorutsky3

  • 1Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, NJ, 07102, USA. xliu@njit.edu.

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|January 24, 2025
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Summary
This summary is machine-generated.

We developed modulated optically computed phase microscopy (M-OCPM) for label-free imaging of cell-nanoparticle interactions. This technology overcomes sensitivity-resolution tradeoffs, enabling detailed study of nanoparticle dynamics in drug delivery systems.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Optical Imaging

Background:

  • Nanoparticles (NPs) are crucial for drug delivery, necessitating understanding of cell-NP interactions.
  • Quantitative phase imaging offers label-free insights into these dynamics.
  • Existing phase imaging methods face a sensitivity-resolution tradeoff.

Purpose of the Study:

  • To develop a novel phase imaging technique overcoming the sensitivity-resolution tradeoff.
  • To enable high-sensitivity, high-resolution, label-free imaging of cell-nanoparticle interactions.
  • To assess the feasibility of the new technique for studying nanoparticle dynamics in biological systems.

Main Methods:

  • Developed modulated optically computed phase microscopy (M-OCPM) using low coherence interferometry and optical computation.
  • M-OCPM utilizes optical computation for Fourier transforms and temporal modulation to circumvent the sensitivity-resolution tradeoff.
  • Evaluated M-OCPM performance with various samples, including cultured cells and nanoparticles.

Main Results:

  • M-OCPM demonstrated label-free imaging with nanometer-scale displacement sensitivity and ~250 nm resolution.
  • Successfully imaged nanoparticles interacting with cultured cells.
  • Distinguished signal characteristics for adhered nanoparticles versus those in the medium.

Conclusions:

  • M-OCPM effectively overcomes the sensitivity-resolution tradeoff in phase imaging.
  • The technology is feasible for studying complex cell-nanoparticle interactions.
  • Provides a powerful tool for optimizing nanoparticle-based drug delivery systems.