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Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
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Technical note: Tracking target/chest relationship changes during motion-synchronized tomotherapy treatments.

William S Ferris1, Wesley S Culberson1, John E Bayouth2

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This summary is machine-generated.

Radixact Synchrony can adapt to gradual target motion changes during radiotherapy, but abrupt shifts require time. Faster imaging improves accuracy, and software updates enhance performance in tracking respiratory motion correlations.

Keywords:
RadixactSynchronytracking

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Image-Guided Therapy

Background:

  • Radixact Synchrony is an intrafraction motion tracking system for helical tomotherapy.
  • It synchronizes the radiation beam with respiratory motion using kV radiographs and chest LEDs.
  • Previous studies confirmed its efficacy with perfectly correlated chest and target motion.

Purpose of the Study:

  • To evaluate Synchrony's accuracy in adapting to changing target/chest motion correlations.
  • To assess performance under scenarios with imperfect correlation.

Main Methods:

  • A phantom with an ion chamber and fiducials simulated the target.
  • A separate motion stage mimicked respiratory (chest) motion.
  • Sinusoidal movements with introduced rigid shifts and linear drifts in target position were used to test correlation changes.

Main Results:

  • Synchrony adapted to gradual drifts (up to 5 mm/min) with minor error increases at 2 s/img.
  • Abrupt 5 mm shifts were adapted to in ~30 s.
  • Longer imaging periods (>4 s/img) resulted in >5 mm errors, triggering treatment pauses.
  • The measured delta (MD) parameter was more responsive to tracking errors than the potential difference (PD) parameter.
  • A recent algorithm update improved tracking of changing correlations.

Conclusions:

  • Synchrony adapts to gradual target/chest correlation changes but requires time for abrupt shifts.
  • Adaptation capability improves with higher imaging frequency.
  • Users should utilize the latest software (3.0.1+) for optimal performance.
  • Further research is needed on patient-specific miscorrelations.