Related Experiment Video
Updated: May 25, 2026

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
Published on: February 6, 2019
Impact of using linear optimization models in dose planning for HDR brachytherapy.
Asa Holm1, Torbjorn Larsson, Asa Carlsson Tedgren
1Department of Mathematics, Linköping University, SE 581 83 Linköping, Sweden. asa.holm@liu.se
Mathematical optimization in high-dose-rate (HDR) brachytherapy can lead to long dwell times. Using alternative piecewise linear penalties, instead of simple linear ones, significantly reduces dwell times and hot spots in HDR brachytherapy plans.
Area of Science:
- Medical Physics
- Radiation Oncology
- Computational Biology
Background:
- Optimization models in high-dose-rate (HDR) brachytherapy often produce longer dwell times than manual plans.
- This can result in undesired radiation hotspots, prompting research into mitigation strategies.
Purpose of the Study:
- To investigate if simple linear penalties in objective functions contribute to long dwell times in HDR brachytherapy.
- To evaluate if alternative piecewise linear penalties can reduce individual dwell times.
Main Methods:
- Mathematical analysis of linear and piecewise linear penalties.
- Retrospective comparison of these penalties in HDR brachytherapy dose plans for prostate cancer patients.
Main Results:
- Piecewise linear penalties significantly reduced dwell times compared to linear penalties.
- Average total dwell times decreased by 4.2%, and maximum dwell times by 25%.
Conclusions:
- Linear penalties are a contributing factor to prolonged dwell times in optimized HDR brachytherapy plans.
- Alternative penalties offer a method to significantly shorten dwell times, improving treatment planning.
More Related Videos
05:18Radiation Planning Assistant - A Web-based Tool to Support High-quality Radiotherapy in Clinics with Limited Resources
Published on: October 6, 2023
07:57Positron Emission Tomography-based Dose Painting Radiation Therapy in a Glioblastoma Rat Model using the Small Animal Radiation Research Platform
Published on: March 24, 2022
Related Concept Videos
Impact of Pharmacokinetic–Pharmacodynamic Models: Regulatory Decisions
Determination of Multiple Dosing Parameters: Loading and Maintenance Doses
Dose Size and Dosing Frequency: Determination Methods
Radiation: Applications
The average...
Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast, controlled...