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[Radiotherapy for breast cancer: respiratory and set-up uncertainties]
M G Saliou1, P Giraud, L Simon
1Département d'oncologie-radiothérapie, institut Curie, 26, rue d'Ulm, 75005 Paris, France. mariegabrielle.saliou@curie.net
Summary
Adjuvant radiotherapy for breast cancer reduces recurrence but poses risks. This review examines geometric uncertainties from patient setup and breathing, crucial for precise conformal radiation therapy and minimizing side effects.
Area of Science:
- Radiation Oncology
- Medical Physics
Background:
- Adjuvant radiotherapy improves locoregional control but increases cardiovascular and pulmonary risks.
- Accurate conformal radiation therapy requires identifying and managing geometric uncertainties to prevent under/overdosing.
Purpose of the Study:
- To review geometric uncertainties in breast cancer radiotherapy due to patient setup and respiratory motion.
- To discuss strategies for mitigating these uncertainties to improve treatment precision and safety.
Main Methods:
- Review of existing literature on geometric uncertainties in breast radiotherapy.
- Analysis of setup errors using Central Lung Distance (CLD) as a predictor.
- Discussion of respiratory motion and proposed gating techniques.
Main Results:
- Setup errors (systematic and random) are estimated at 3.8 mm and 3.2 mm, respectively, influenced by immobilization devices.
- Breast motion during respiration can range from 0.8 to 10 mm.
- Central Lung Distance (CLD) is a key indicator for setup uncertainties.
Conclusions:
- Geometric uncertainties from setup and respiration are significant in breast radiotherapy.
- Strategies like improved immobilization, portal imaging, and respiratory gating can reduce these uncertainties.
- Departments should conduct site-specific assessments of geometric uncertainties for optimal treatment planning.