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Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
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Respiratory motion management in particle therapy.

Eike Rietzel1, Christoph Bert

  • 1Abteilung Biophysik, GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, 64291 Darmstadt, Germany. eike@rietzel.net

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Charged particle therapy shows promise, but moving tumors require motion mitigation techniques like rescanning and beam gating. Beam tracking offers precision but needs advanced real-time monitoring for clinical use.

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Area of Science:

  • Medical physics
  • Radiation oncology

Background:

  • Charged particle therapy, particularly scanning beam technology, is advancing towards clinical application.
  • Motion during scanned beam treatments can cause significant dose inaccuracies (over- and underdosage).

Purpose of the Study:

  • To review and evaluate motion mitigation techniques for scanned beam charged particle therapy.
  • To assess the clinical readiness and potential of rescanning, beam gating, and beam tracking.

Main Methods:

  • Discussion of experimental studies on rescanning, beam gating, and beam tracking.
  • Analysis of the principles and limitations of each motion mitigation strategy.

Main Results:

  • Rescanning and beam gating are expected to be clinically available within several years.
  • Beam gating may initially mitigate interplay effects without reducing margins, later enabling margin reduction with improved monitoring.
  • Beam tracking, while precise, requires advanced real-time motion monitoring for clinical implementation.

Conclusions:

  • Motion mitigation is crucial for effective scanned beam charged particle therapy.
  • Rescanning and beam gating represent near-term solutions, with beam gating offering potential for improved dose conformity.
  • Beam tracking holds future promise for highly conformal treatments but requires significant technological advancements.