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3D Orbital Tracking in a Modified Two-photon Microscope: An Application to the Tracking of Intracellular Vesicles
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Improving z-tracking accuracy in the two-photon single-particle tracking microscope.

C Liu1, Y-L Liu1, E P Perillo1

  • 1Department of Biomedical Engineering, University of Texas at Austin , Austin, Texas 78712, USA.

Applied Physics Letters
|November 10, 2015
PubMed
Summary

We developed a maximum likelihood estimator (MLE) method to enhance z-tracking accuracy in the TSUNAMI microscope. This technique improves 3D particle localization and enables precise analysis of biological processes like DNA hybridization kinetics.

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Area of Science:

  • Biophysics
  • Microscopy
  • Computational Biology

Background:

  • Single-particle tracking (SPT) is crucial for observing molecular dynamics.
  • The TSUNAMI (Tracking of Single particles Using Nonlinear And Multiplexed Illumination) microscope offers advanced capabilities but requires improved z-axis accuracy.
  • Accurate 3D positioning is essential for quantitative analysis of biological processes at the nanoscale.

Purpose of the Study:

  • To enhance the z-tracking accuracy of the TSUNAMI microscope.
  • To develop a robust method for precise 3D particle localization using advanced statistical estimation.
  • To demonstrate the utility of improved tracking for analyzing dynamic biological systems.

Main Methods:

  • Implementation of a maximum likelihood estimator (MLE) to determine particle 3D positions.
  • Utilizing time-correlated photon count distributions to maximize positional likelihood.
  • Employing Monte Carlo simulations to validate and quantify improvements in tracking accuracy.
  • Applying the method to analyze *in silico* DNA hybridization-melting kinetics.

Main Results:

  • The MLE-based method improved the z-tracking accuracy of the TSUNAMI microscope by 1.7-fold.
  • MLE significantly reduced the temporal correlation of z-tracking errors.
  • Precise recovery of DNA hybridization-melting kinetics was achieved from numerous short single-particle trajectories.
  • The developed method shows general applicability to other 3D SPT techniques.

Conclusions:

  • The MLE approach offers a substantial improvement in z-tracking accuracy for TSUNAMI microscopy.
  • Reduced tracking errors enable more reliable quantitative analysis of molecular dynamics.
  • This method provides a valuable tool for advancing 3D single-particle tracking applications in various biological studies.