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Related Experiment Video

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Remote Magnetic Navigation for Accurate, Real-time Catheter Positioning and Ablation in Cardiac Electrophysiology Procedures
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Dynamic electronic collimation method for 3-D catheter tracking on a scanning-beam digital x-ray system.

David A P Dunkerley1, Jordan M Slagowski1, Tobias Funk2

  • 1University of Wisconsin-Madison, Department of Medical Physics, Madison, Wisconsin, United States.

Journal of Medical Imaging (Bellingham, Wash.)
|April 26, 2017
PubMed
Summary

Dynamic electronic collimation (DEC) significantly reduces radiation dose during scanning-beam digital x-ray (SBDX) 3-D catheter tracking. This method maintains high tracking accuracy, making it a feasible approach for dose reduction in medical imaging.

Keywords:
catheter trackingcollimationinverse geometryscanning-beam digital x-rayx-ray fluoroscopy

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Area of Science:

  • Medical Imaging
  • Radiology
  • Biomedical Engineering

Background:

  • Scanning-beam digital x-ray (SBDX) enables 3-D catheter tracking using tomosynthesis.
  • Reducing radiation dose is crucial in fluoroscopic procedures.

Purpose of the Study:

  • To propose and evaluate a dose-reduced 3-D catheter tracking method using dynamic electronic collimation (DEC) in SBDX systems.
  • To assess the impact of DEC on radiation dose and tracking accuracy.

Main Methods:

  • Retrospective evaluation of SBDX detector data from a phantom study.
  • Implementation of dynamic electronic collimation (DEC) by selectively deactivating focal spot positions.
  • Monte Carlo simulations to calculate dose-area product (DAP) and peak skin dose (PSD).

Main Results:

  • DEC reduced active focal spots per frame to 7.6% of the full field-of-view (FOV) value.
  • Average DAP was reduced to 7.8% of the full FOV value.
  • Peak skin dose (PSD) for moving catheters ranged from 33.6% to 34.8% of full FOV values.
  • Root-mean-squared-deviation between DEC and full FOV 3-D tracking coordinates was < 0.1 mm.

Conclusions:

  • Dynamic electronic collimation (DEC) is a feasible method for dose reduction in SBDX 3-D catheter tracking.
  • DEC maintains high accuracy in 3-D catheter tracking, with minimal deviation compared to full FOV methods.