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Modeling Breast Cancer in Human Breast Tissue using a Microphysiological System
Published on: April 23, 2021
Tissue modeling schemes in low energy breast brachytherapy
Hossein Afsharpour1, Guillaume Landry, Brigitte Reniers
1Département de Radio-Oncologie et Centre de Recherche en Cancérologie de l'Université Laval, Centre Hospitalier Universitaire de Québec, 11 Côte du Palais, Québec, QC G1R2J6, Canada.
Physics in Medicine and Biology
|October 22, 2011
Summary
Accurate breast tissue modeling is crucial for low-energy brachytherapy dosimetry. The segmented breast tissue (SBT) method offers the most reliable geometric models, improving dose calculations in breast cancer treatment.
Area of Science:
- Medical Physics
- Radiation Oncology
- Biomedical Engineering
Background:
- Breast tissue composition (glandular vs. adipose) varies significantly.
- Current brachytherapy dosimetry often uses water-based approximations (AAPM TG43).
- Tissue heterogeneity impacts absorbed dose distributions in accelerated partial breast irradiation.
Purpose of the Study:
- To evaluate different breast tissue modeling schemes for low-energy photon brachytherapy.
- To assess the impact of tissue composition and density on dosimetry.
- To identify optimal modeling for permanent seed implants in breast brachytherapy.
Main Methods:
- Compared six breast tissue models: UWB, NUWB, UGAB, NUGAB, ADB, and SBT.
- Analyzed dosimetry using the PTV D(90) metric (dose to water, D(90(w,m))).
- Evaluated models for a permanent seed implant scenario in 38 patients.
Main Results:
- Non-uniform water breast (NUWB) showed a 4.6% lower dose than UWB.
- G/A breast models (UGAB, NUGAB) demonstrated significant differences (17-26%) compared to TG43, highlighting composition effects.
- Segmented breast tissue (SBT) resulted in a 12% larger D(90(w,m)) than TG43, with patient-specific variations (4-20%).
Conclusions:
- Dosimetry is highly sensitive to the chosen breast tissue modeling scheme.
- The segmented breast tissue (SBT) method provides the most geometrically reliable models.
- Standardization of tissue modeling is recommended for consistent low-energy breast brachytherapy outcomes.
