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Calculation of absorbed dose distributions from dynamic wedges
P Storchi1, E Woudstra, P Verlinde
1Dr Daniel den Hoed Cancer Center, Rotterdam, The Netherlands.
Physics in Medicine and Biology
|July 3, 1998
Summary
A new algorithm simplifies radiotherapy planning for dynamic wedges by calculating dose distributions using open beam data. This method avoids extensive measurements, improving efficiency in radiation therapy.
Area of Science:
- Medical Physics
- Radiation Oncology
Background:
- Dynamic wedges in photon beam radiotherapy offer flexibility but complicate dose distribution measurements.
- Accurate absorbed dose measurements for dynamic wedges require complete jaw movement, hindering real-time radiotherapy planning.
Purpose of the Study:
- To develop and describe an algorithm for calculating dose distributions from dynamic wedges.
- To enable radiotherapy planning without extensive measurements for each specific dynamic wedge beam.
Main Methods:
- The algorithm employs the convolution of pencil beam kernels with a non-uniform field function.
- Pencil beam kernels are derived from empirical data obtained from open beam measurements only.
Main Results:
- The described algorithm facilitates the calculation of absorbed dose distributions for dynamic wedges.
- The method relies on a limited number of measurements, specifically from the open beam.
Conclusions:
- The developed algorithm provides an efficient method for radiotherapy planning with dynamic wedges.
- This approach reduces the need for comprehensive measurements, streamlining the planning process.