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Electron postmastectomy chest wall plus comprehensive nodal irradiation technique using Electron Monte Carlo dose

Linda Hong1, Ase Ballangrud1, Beryl McCormick2

  • 1Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, NY, USA.

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
|October 17, 2017
PubMed
Summary

This study introduces a novel electron beam technique for left-sided postmastectomy patients, effectively sparing the heart while delivering precise radiation doses to the chest wall and lymph nodes, even with complex anatomy.

Keywords:
Electron Monte Carlo dose calculationsElectron postmastectomy chest wall irradiationHeart sparing

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiotherapy Techniques

Background:

  • Traditional radiotherapy techniques for left-sided postmastectomy patients can be challenging due to anatomical variations.
  • Abnormal chest wall contours, heart proximity, or extensive excision scars can impede effective radiation delivery.
  • Comprehensive nodal irradiation is crucial for optimal treatment outcomes in these patients.

Purpose of the Study:

  • To develop and evaluate a novel electron beam irradiation technique for left-sided postmastectomy patients with challenging anatomy.
  • To assess the dosimetric feasibility of this technique, focusing on target coverage and organ-at-risk sparing.
  • To determine the efficacy of the Electron Monte Carlo (EMC) dose algorithm in calculating electron beam doses for complex treatment plans.

Main Methods:

  • A dosimetry study was conducted on ten left-sided postmastectomy patients with complex anatomical features.
  • An en face electron beam technique was designed using a single isocenter and gantry angle with varying energy beams and cutouts.
  • The Electron Monte Carlo (EMC) dose algorithm was employed for accurate dose calculations, and fields were matched to photon supraclavicular fields.

Main Results:

  • The electron chest wall irradiation technique successfully delivered the prescribed 50 Gy dose to target volumes while meeting institutional normal tissue dose constraints.
  • Mean heart dose was significantly reduced, averaging 3.0 Gy ± 0.8 Gy.
  • Acceptable ipsilateral lung doses (V20Gy 33.2% ± 4.5%) and minimal doses to the contralateral lung (V5Gy 5.1% ± 5.0%) and breast (V5Gy 3.3% ± 3.1%) were achieved.

Conclusions:

  • The developed electron chest wall irradiation technique, utilizing the EMC dose algorithm, is a feasible and effective method for treating left-sided postmastectomy patients with challenging anatomy.
  • This technique allows for adequate dose delivery to the chest wall and nodal regions while achieving significant heart sparing.
  • The dosimetric results demonstrate the potential of this technique to improve treatment outcomes and reduce toxicity in a complex patient population.