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Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
Published on: June 7, 2015
Modeling simulation and visualization of conformal 3D lung tumor dosimetry
Anand Santhanam1, Twyla R Willoughby, Sanford L Meeks
1Department of Radiation Oncology, M D Anderson Cancer Center Orlando, 1400S Orange Ave., Orlando, FL 32806, USA.
Physics in Medicine and Biology
|October 2, 2009
Summary
Lung tumors move during breathing, affecting radiation therapy accuracy. This study presents a validated simulation framework to accurately calculate radiation dose delivery to moving lung tumors and surrounding tissues in real-time.
Area of Science:
- Medical Physics
- Radiation Oncology
- Computational Biology
Background:
- Lung tumor motion during respiration compromises accurate radiation dose delivery.
- Variations in tumor motion depend on patient physiology and breathing patterns.
- Precise dose calculation for moving targets is crucial for effective radiotherapy.
Purpose of the Study:
- To develop and validate a computer-based simulation framework for calculating radiation dose delivered to 3D moving lung tumors.
- To predict the impact of tumor motion (rate, amplitude, direction) and size on radiation dose accumulation.
- To assess the real-time capability of the simulation framework for adaptive radiotherapy.
Main Methods:
- A computer simulation framework was developed to model 3D lung tumors and their motion during simulated radiation dose delivery.
- Tumor motion was simulated with varying rates, amplitudes, and directions, mimicking breathing variations.
- Radiation dose was extracted from a treatment plan, and accumulated dose on the tumor was calculated in real-time.
- Simulation results were validated using 2D film dosimetry measurements with a 4D motion phantom.
Main Results:
- Simulated radiation dose accumulation on the tumor significantly varied with tumor size, motion rate, amplitude, and direction.
- Smaller tumors accumulated a smaller percentage of the radiation dose for a given motion profile.
- The simulation framework demonstrated real-time capability with 40 motion steps per breath, exceeding 4D CT capabilities.
- Validation confirmed the accuracy of the simulation framework against experimental measurements.
Conclusions:
- The developed simulation framework accurately calculates radiation dose delivered to moving lung tumors.
- Tumor motion characteristics and size are critical factors influencing radiation dose distribution.
- The framework's real-time capability supports integration with real-time tumor monitoring for adaptive radiotherapy.
