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An optimized software framework for real-time, high-throughput tracking of spherical beads.

J P Cnossen1, D Dulin1, N H Dekker1

  • 1Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.

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Summary

This study introduces a fast, open-source software for tracking hundreds of beads in real-time, enhancing single-molecule biophysics experiments. The new framework accelerates bead localization calculations, enabling high-throughput analysis.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Image Analysis

Background:

  • Biophysical techniques often rely on tracking spherical beads bound to biomolecules.
  • Advances in camera technology allow simultaneous imaging of many beads, increasing experimental data.
  • Computational limitations in frame rates and tracking algorithms hinder rapid bead coordinate determination.

Purpose of the Study:

  • To develop a scalable, open-source software framework for accelerating bead localization calculations.
  • To enable accurate, real-time tracking of hundreds of beads using consumer hardware.
  • To improve the efficiency and throughput of single-molecule biophysics experiments.

Main Methods:

  • Implementation of a software framework utilizing CUDA parallel computing.
  • Application of the Quadrant Interpolation algorithm for bead localization.
  • Testing and validation on consumer hardware with magnetic tweezers setup.

Main Results:

  • Accurate and simultaneous tracking of hundreds of beads in real-time.
  • Tracking scatter close to the Cramer-Rao Lower Bound, indicating high accuracy.
  • Demonstrated tracking of 228 DNA-tethered beads at 58 Hz with ~1 nm standard deviation.

Conclusions:

  • The developed software framework significantly accelerates bead localization for biophysical techniques.
  • The framework facilitates high-throughput single-molecule approaches by enabling real-time, accurate multi-bead tracking.
  • Identified and reported a previously unreported tracking bias along the optical axis.