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Related Experiment Videos

Peripheral equivalent neutron dose model implementation for radiotherapy patients.

L Irazola1, J A Terrón2, B Sánchez-Nieto3

  • 1Departamento de Fisiología Médica y Biofísica, Universidad de Sevilla, Spain; Servicio de Radiofísica, Hospital Universitario Virgen Macarena, Sevilla, Spain.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
|April 5, 2017
PubMed
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10-MV SBRT FFF IRRADIATION TECHNIQUE IS ASSOCIATED TO THE LOWEST PERIPHERAL DOSE: THE OUTCOME OF 142 TREATMENT PLANS FOR THE 10 MOST COMMON TUMOUR LOCATIONS.

Radiation protection dosimetry·2019

This study improves neutron peripheral dose (PND) estimation for radiotherapy patients of all sizes, reducing cancer risk. The new model accurately estimates PND in children, unlike the previous version.

Area of Science:

  • Medical Physics
  • Radiotherapy Dosimetry
  • Radiation Biology

Background:

  • High-energy radiotherapy can lead to neutron peripheral contamination, increasing secondary cancer risk.
  • Estimating peripheral neutron dose (PND) is crucial, but existing models often lack generalization across patient sizes.
  • Patient size significantly impacts neutron dose distribution, necessitating size-specific dosimetry.

Purpose of the Study:

  • To generalize an existing PND estimation methodology for adult patients to include children and adolescents.
  • To improve the accuracy of PND calculations for implementation in treatment planning systems (TPS).
  • To account for patient anatomy in PND estimations.

Main Methods:

  • Generalized a thermal neutron detector model for broader usability.
Keywords:
Peripheral neutron dose model

Related Experiment Videos

  • Developed a new PND model incorporating total neutron spectra and dose-to-point thermal neutron fluence measurements.
  • Validated the model using three phantom sizes (adult, teen, child) and two treatment sites (H&N, abdomen) across 510 patients.

    • Main Results:

    • The upgraded model demonstrated strong concordance between experimental and theoretical estimations.
    • No significant differences were observed between the upgraded and original models for adult patients.
    • The original model underestimated PND in children by an average of 34.1%.

    Conclusions:

    • An improved, anatomy-aware PND model has been successfully validated in real patients.
    • The methodology is readily implementable in clinical settings and TPS due to easily accessible input parameters.
    • This advancement enhances radiation safety in radiotherapy by providing more accurate PND assessments for all patient demographics.