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Updated: Mar 2, 2026

Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
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SU-E-T-383: Pulsed Low Dose Rate Radiotherapy Using Advanced Treatment Methods: A Novel Technique for Patient

M Lin1, R Price1, S Koren1

  • 1Fox Chase Cancer Center, Philadlephia, PA.

Medical Physics
|May 19, 2017
PubMed
Summary

Pulsed low dose-rate radiotherapy (PLDR) using Intensity-Modulated Radiation Therapy (IMRT) and RapidArc techniques shows promise for recurrent cancers. This approach offers dosimetric and radiobiological benefits, potentially improving outcomes for previously irradiated patients.

Keywords:
CancerDosimetryIntensity modulated radiation therapyLungsMedical radiation safetyRadiation therapyTissues

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Cancer Treatment

Background:

  • Pulsed low dose-rate radiotherapy (PLDR) re-irradiation aims to reduce late normal tissue toxicity while maintaining tumor control for recurrent cancers.
  • PLDR delivers 20cGy pulses every 3 minutes, achieving an effective dose rate of 6.7cGy/min, contrasting with conventional rates of 400-600cGy/min.

Purpose of the Study:

  • To investigate the planning strategy and delivery quality of PLDR treatment using Intensity-Modulated Radiation Therapy (IMRT) and RapidArc techniques.
  • To evaluate the feasibility of PLDR for various cancer sites, including prostate, pancreas, lung, head-and-neck, breast, and pelvis.

Main Methods:

  • Twenty cases were analyzed, with 10 treated using PLDR IMRT and 10 for evaluation.
  • IMRT and RapidArc plans were generated using the Eclipse Treatment Planning System (TPS).
  • Dose contribution to the planning target volume (PTV), machine operation dose rate, plan quality, and dose delivery accuracy were assessed.

Main Results:

  • Mean PTV dose varied: 16.1-26.1cGy/arc for RapidArc and 10.3-36.7cGy/field for IMRT.
  • IMRT PTV dose contribution depended on beam arrangement and optimization.
  • A machine operation dose rate of 100 MU/min ensured superior delivery accuracy (>97.7% gamma-passing rate for 3%/3mm criteria) for both techniques.

Conclusions:

  • PLDR radiotherapy with IMRT and RapidArc offers dosimetric and radiobiological advantages.
  • This technique holds significant potential for improving outcomes in previously irradiated patients with recurrent cancers.