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Optical tracking with two markers for robust prospective motion correction for brain imaging.

Aditya Singh1, Benjamin Zahneisen2, Brian Keating2

  • 1Department of Medicine, The Queen's Medical Center, John A. Burns School of Medicine, University of Hawaii, 1356 Lusitana Street 7th Floor, Honolulu, HI, 96813, USA. singha@hawaii.edu.

Magma (New York, N.Y.)
|July 1, 2015
PubMed
Summary

This study introduces a dual-marker prospective motion correction (PMC) system for brain imaging. The enhanced system improves image quality by preventing false corrections from facial movements and maintaining tracking during marker obstruction.

Keywords:
BrainMRIMotion artifactsMotion correctionOptical tracking

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Neuroimaging

Background:

  • Prospective motion correction (PMC) in brain imaging is crucial for artifact reduction.
  • Current camera-based PMC systems using single skin markers face challenges like marker occlusion and false corrections due to non-rigid facial motions.

Purpose of the Study:

  • To develop and validate a modified PMC system to enhance robustness and mitigate common failure modes.
  • To improve the reliability of motion correction in brain MRI.

Main Methods:

  • Simultaneous tracking of two six-degrees-of-freedom markers placed on the forehead.
  • Implementation of adaptive marker tracking and skin movement detection algorithms.
  • Comparison of the dual-marker technique against a single-marker approach.

Main Results:

  • Experimental validation of adaptive marker tracking and skin movement detection theories.
  • Demonstrated significant improvement in image quality when one marker's line-of-sight was obstructed.
  • Successful mitigation of artifacts caused by subject squinting and combined movements.

Conclusions:

  • The proposed dual-marker PMC method effectively eliminates key failure modes of single-marker systems.
  • Substantial improvement in the robustness of prospective motion correction is achieved.
  • The adaptable multi-marker tracking approach can be applied to various optical tracking systems.