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Related Experiment Video

Updated: Jun 23, 2025

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Dose-Painting Proton Radiotherapy Guided by Functional MRI in Non-enhancing High-Grade Gliomas.

Z Zhu1, G Gong2, L Wang2

  • 1Harbin Medical University, No.157, Baojian Road, Nangang District, Harbin City, 150081, Heilongjiang Province, China; Department of Radiation Oncology Physics and Technology, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, No.440 Jiyan Road, Huaiyin District, Jinan City, 250117, Shandong Province, China.

Clinical Oncology (Royal College of Radiologists (Great Britain))
|June 14, 2024
PubMed
Summary
This summary is machine-generated.

Dose-painting proton radiotherapy (PRT) guided by functional MRI is feasible for non-enhancing high-grade gliomas (NE-HGGs). PRT improves tumor control probability (TCP) while sparing organs at risk (OARs), offering potential clinical benefits.

Keywords:
Dose paintingFunction magnetic resonance imagingGliomaProton radiotherapyThree-dimensional arterial spin labeling

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Area of Science:

  • Radiation Oncology
  • Medical Imaging
  • Neuro-oncology

Background:

  • Non-enhancing high-grade gliomas (NE-HGGs) present treatment challenges.
  • Functional MRI (fMRI) offers insights into tumor biology for precise targeting.
  • Proton radiotherapy (PRT) allows for conformal dose delivery.

Purpose of the Study:

  • To assess the feasibility of dose-painting PRT using fMRI in NE-HGGs.
  • To evaluate the dosimetric and clinical impact of fMRI-guided PRT compared to IMRT.
  • To determine the potential for improved tumor control and reduced toxicity.

Main Methods:

  • Retrospective analysis of 10 NE-HGG patients' MR images (3D-ASL, T2 FLAIR).
  • Defined planning target volumes (PTV) and simultaneous integrated boost (SIB) volumes based on MRI.
  • Generated PRT and IMRT plans with varying dose prescriptions, including dose escalation to SIB.
  • Compared dosimetric parameters and assessed tumor control probability (TCP) and normal tissue complication probability (NTCP) using biological models.

Main Results:

  • PRT plans showed improved sparing of organs at risk (OARs) compared to IMRT, with significant dose reductions (>27-50%) to critical structures.
  • PRT achieved higher tumor control probability (TCP >98% at 96 GyE) compared to IMRT (TCP >91% at 84 Gy).
  • Normal tissue complication probability (NTCP) for the brain (Br-PTV) was comparable (1.30% vs 1.90%), and near zero for other OARs with PRT.

Conclusions:

  • Functional MRI-guided dose-painting PRT is feasible for NE-HGGs.
  • PRT demonstrates potential for enhanced tumor control with significant OAR sparing.
  • This approach may offer a beneficial strategy for managing NE-HGGs.