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Related Concept Videos

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Quantifying Cognitive Decrements Caused by Cranial Radiotherapy
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Published on: October 18, 2011

Strategic modulation to avoid radiation toxicities for brain integrity (SMART-BRAIN).

Roman O Kowalchuk1, Piero Fossati2, Janelle Miller1

  • 1Mayo Clinic Department of Radiation Oncology, USA.

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|July 9, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel target volume for medulloblastoma radiotherapy, using proton beams to minimize cognitive toxicity by sparing critical brain regions and reducing neurotoxicity.

Keywords:
Craniospinal irradiationMedulloblastomaNeurotoxicityPersonalized medicineProton therapy

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Area of Science:

  • Radiation Oncology
  • Pediatric Neuro-oncology
  • Medical Physics

Background:

  • Craniospinal irradiation (CSI) is crucial for medulloblastoma control but causes significant morbidity.
  • Cranial irradiation is linked to neurocognitive deficits in pediatric patients.
  • Minimizing radiation dose to healthy brain tissue is essential for reducing long-term side effects.

Purpose of the Study:

  • To develop a novel target volume (CTV_2340 cGy) for medulloblastoma.
  • To explore the dosimetric benefits of proton therapy for reducing cognitive toxicity.
  • To potentially spare non-target brain (NTB) regions, including white matter tracts and thalami.

Main Methods:

  • Literature review to define patterns of medulloblastoma failure.
  • Generation of proton and photon treatment plans for a new CTV_2340 in five pediatric patients.
  • Utilized 3D robust optimization for proton plans, accounting for range and setup uncertainties.
  • Defined planning target goals for V100% ≥ 95% and V98% ≥ 97%.

Main Results:

  • Medulloblastoma recurrence patterns support omitting irradiation of certain non-target brain areas.
  • Proton plans achieved target coverage goals, with median NTB comprising 15% of brain volume.
  • Limited hippocampal sparing was observed due to CTV_2340 overlap (median V18 Gy 99.1%).
  • Photon plans demonstrated inferior target coverage and minimal sparing of NTB.

Conclusions:

  • Proton-based radiotherapy with a novel CTV_2340 offers a strategic approach to reduce neurotoxicity in medulloblastoma.
  • This method shows potential for sparing critical brain regions, thereby minimizing radiotherapy-related neurotoxicity.
  • Further multi-institutional studies are recommended to validate and advance this technique.