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SU-E-J-42: Motion Adaptive Image Filter for Low Dose X-Ray Fluoroscopy in the Real-Time Tumor-Tracking Radiotherapy

N Miyamoto1, M Ishikawa1, K Sutherland1

  • 1Graduate School of Medicine, Hokkaido University, Sapporo, Japan.

Medical Physics
|May 19, 2017
PubMed
Summary
This summary is machine-generated.

A new recursive image filter improves fiducial marker detection in low-dose fluoroscopy for radiotherapy. This method maintains tracking accuracy, comparable to high-dose imaging, reducing patient radiation exposure.

Keywords:
DosimetryFluoroscopyGoldImage detection systemsImage processingImage registrationMedical image qualityMedical imagingRadiation therapySolution processes

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Area of Science:

  • Medical physics
  • Radiotherapy technology
  • Image processing

Background:

  • Real-time tumor-tracking radiotherapy relies on X-ray fluoroscopy for fiducial marker detection.
  • Optimizing fluoroscopic parameters to minimize radiation dose is crucial.
  • Low-dose imaging often compromises marker visibility due to statistical noise, impacting tracking accuracy.

Purpose of the Study:

  • To develop and evaluate a recursive image filter for enhancing fiducial marker detection in low-dose fluoroscopy.
  • To maintain marker tracking accuracy and stability while reducing imaging dose.
  • To address the challenge of marker recognition in noisy, low-dose fluoroscopic images.

Main Methods:

  • A recursive image filter was designed and applied to fluoroscopic images of a gold fiducial marker.
  • Experiments simulated respiratory motion by sequentially shifting recorded images.
  • Image registration error and pattern recognition score (PRS) were measured under low-dose and high-dose imaging conditions, with and without the filter.

Main Results:

  • In low-dose imaging, the recursive filter reduced image registration error from 2.15±1.21 to 1.48±0.82 pixels.
  • The filter improved the pattern recognition score (PRS) from 46.67±6.40 to 67.80±4.51.
  • Low-dose imaging with the filter achieved results comparable to high-dose imaging without the filter.

Conclusions:

  • The proposed recursive image filter effectively enhances fiducial marker tracking stability and accuracy.
  • The filter enables reliable marker detection in low-dose fluoroscopy, crucial for radiotherapy.
  • This approach allows for reduced radiation exposure without sacrificing tracking performance.