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A Novel Framework for the Optimization of Simultaneous ThermoBrachyTherapy.
Ioannis Androulakis1, Rob M C Mestrom2, Miranda E M C Christianen1
1Department of Radiotherapy, Erasmus MC Cancer Institute, University Medical Center Rotterdam, 3015 Rotterdam, The Netherlands.
Cancers
|March 25, 2022
Summary
Simultaneous ThermoBrachyTherapy combines high-dose-rate brachytherapy (HDR-BT) and interstitial hyperthermia (IHT) for prostate cancer. This optimized approach reduces radiation dose to healthy tissues while maintaining tumor control.
Area of Science:
- Oncology
- Medical Physics
- Biomedical Engineering
Background:
- High-dose-rate brachytherapy (HDR-BT) combined with interstitial hyperthermia (IHT) aims to enhance prostate cancer treatment efficacy.
- Simultaneous application of HDR-BT and IHT is hypothesized to maximize tumor radiosensitization.
Purpose of the Study:
- To develop and present a method for optimizing the 3D temperature distribution in simultaneous HDR-BT and IHT.
- To calculate the equivalent physical dose (EQDphys) of the combined treatment to optimize electrode settings.
Main Methods:
- Precomputation of temperature distribution from each electrode.
- Calculation of EQDphys using a temperature-dependent linear-quadratic model.
- Optimization algorithm to determine optimal electrode settings for simultaneous ThermoBrachyTherapy.
Main Results:
- The method was applied to 10 patient cases using established thermoradiobiological parameters.
- Achieved equivalent dose coverage of the target with a 20% reduction in physical radiation dose.
- Demonstrated a significant reduction in EQDphys to organs at risk (p < 0.001).
Conclusions:
- Simultaneous ThermoBrachyTherapy offers a potential therapeutic benefit for prostate cancer patients.
- This approach allows for dose reduction to surrounding healthy tissues.
- Optimized temperature distribution is key to maximizing treatment efficacy and minimizing toxicity.
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