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Related Experiment Video

Updated: Nov 27, 2025

Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
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Cleaning the dose falloff in lung SBRT plan.

Dharmin Desai1, Ganesh Narayanasamy2, Milan Bimali3

  • 1Memorial Hospital, Chattanooga, TN, USA.

Journal of Applied Clinical Medical Physics
|December 7, 2020
PubMed
Summary

A new planning technique significantly reduced dose spillage in lung Stereotactic Body Radiation Therapy (SBRT) plans. This method improved target conformity and organ-at-risk sparing, meeting RTOG protocol tolerances.

Keywords:
dose falloffdose gradientdose spilllung SBRTnormal tissue toxicity

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiotherapy Planning

Background:

  • Lung Stereotactic Body Radiation Therapy (SBRT) requires precise dose delivery to minimize spillage.
  • Current planning techniques may struggle to meet strict dose falloff criteria (R50%, D2cm) outlined in RTOG protocols.
  • Optimizing dose conformity and sparing organs-at-risk (OARs) remains a challenge in lung SBRT.

Purpose of the Study:

  • To investigate a novel planning technique utilizing shell structures to reduce low-to-intermediate dose spillage in lung SBRT.
  • To assess the ability of this technique to improve R50% and D2cm values beyond established RTOG tolerances.
  • To evaluate the impact of the new technique on target conformity and OAR doses.

Main Methods:

  • Retrospective analysis of 102 lung SBRT VMAT plans.
  • Re-planning of 32 plans violating RTOG R50% or D2cm tolerances using novel shell structures and optimization constraints.
  • Implementation of "OptiForR50" shell and a 0.5 cm thick shell for D2cm constraints.
  • Statistical comparison using Wilcoxon signed-rank test.

Main Results:

  • Re-optimization significantly reduced mean R50% from 4.68 to 3.89 (P < 0.01) and D2cm from 56.49 to 52.51 (P < 0.01).
  • The novel technique successfully brought all re-planned cases within RTOG protocol limits.
  • Statistically significant improvements were observed in target conformity index, PTV 105% isodose volume, normal lung V20, and mean heart/aorta doses (P < 0.05).

Conclusions:

  • The developed planning methodology, incorporating novel shell structures like OptiForR50, effectively reduces dose spillage in lung SBRT.
  • This technique leads to significant improvements in R50% and D2cm values, ensuring compliance with RTOG protocols.
  • The approach enhances target conformity and OAR sparing, representing a valuable advancement in lung SBRT planning.