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Optimization and comparison of balloon-based partial breast brachytherapy using a single source, a standard plan line
Katie Eyre1, Diane Whitney, Mukesh Mukesh
1Department of Medical Physics, Addenbrooke's Hospital, Cambridge, UK. katie.eyre@addenbrookes.nhs.uk
Brachytherapy
|June 27, 2012
Summary
Multilumen brachytherapy significantly improves partial breast irradiation coverage and reduces organ-at-risk dose compared to single-source techniques. Forward-planned multilumen (ML) is a practical option, expanding treatment eligibility.
Area of Science:
- Radiation Oncology
- Medical Physics
- Brachytherapy
Background:
- Partial breast irradiation (PBI) is an alternative to whole breast irradiation for early-stage breast cancer.
- Balloon-based brachytherapy offers precise radiation delivery.
- Optimizing dosimetric techniques is crucial for treatment efficacy and safety.
Purpose of the Study:
- To directly compare the dosimetric performance of four balloon-based partial breast brachytherapy techniques.
- Techniques compared include single source, standard line source, forward-planned multilumen (ML), and inverse-planned ML.
- To evaluate the feasibility of using a standard line source plan as a starting point for forward-planned ML.
Main Methods:
- Dosimetric evaluation of 12 patients treated with PBI.
- Comparison of single-source, standard line source, forward-planned ML, and inverse-planned ML techniques.
- Adherence to specific dosimetric constraints: PTV_EVAL D95 ≥95% of prescribed dose, maximum skin/rib dose ≤125%, breast V150 ≤50cc, and V200 ≤10cc.
Main Results:
- The proportion of patients meeting all dosimetric constraints increased from 1/12 (single-source) to 6/12 (inverse ML) and 7/12 (forward ML).
- Standard line source and ML plans significantly improved PTV_EVAL D95 compared to single-source plans.
- Forward-planned ML took approximately 7 minutes longer than inverse-planned ML.
Conclusions:
- Multilumen techniques enhance target coverage, particularly at catheter ends, and reduce dose to organs at risk.
- Forward-planned ML, using a standard line source as a base, offers a practical approach for centers lacking inverse planning software.
- ML techniques expand treatment eligibility to patients previously unsuitable for single-catheter PBI.
