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Multileaf Collimator Modeling and Commissioning for Complex Radiation Treatment Plans Using 2-Dimensional (2D) Diode
Jian Guo1, Meng Zhu2, Weijin Zeng3
1Department of Radiation Oncology, The First Affiliated Hospital of Soochow University, Suzhou, China.
Technology in Cancer Research & Treatment
|February 5, 2024
Summary
The ExpressMLC package and MapCHECK2 enable efficient multileaf collimator (MLC) modeling and commissioning for radiation therapy. This combination offers an accurate alternative to traditional film-based methods, improving workflow without compromising precision.
Area of Science:
- Medical Physics
- Radiation Oncology
- Radiotherapy Physics
Background:
- Accurate multileaf collimator (MLC) modeling and commissioning are critical for complex radiation treatment plans.
- Traditional film-based dosimetry methods can be time-consuming for MLC commissioning.
- Developing efficient and accurate data collection tools is essential for modern radiotherapy.
Purpose of the Study:
- To develop a data-collecting package named ExpressMLC for MLC modeling.
- To investigate the applicability of the MapCHECK2 2D diode array for MLC modeling and commissioning.
- To compare the efficiency and accuracy of MapCHECK2 with traditional film-based methods.
Main Methods:
- Developed the ExpressMLC package incorporating realistic MLC parameters.
- Used 8 single-beam plans from ExpressMLC for parameter determination.
- Commissioned the MLC model using 4 AAPM TG 119 IMRT plans, recalculated on MapCHECK2 and compared with Varian accelerator measurements.
Main Results:
- MapCHECK2 achieved gamma passing rates >90.9% (3%/2mm) and >89.3% (2%/2mm) for per-beam dose verification.
- MapCHECK2 demonstrated composite beam dose verification with gamma passing rates >95.9% (3%/2mm) and >90.3% (2%/2mm).
- No statistically significant difference (p > 0.36) was found between MapCHECK2 and film-based verification, indicating comparable accuracy.
Conclusions:
- The ExpressMLC package and MapCHECK2 are suitable for MLC modeling and commissioning, providing sufficient data for parameter determination.
- MapCHECK2 serves as an effective alternative to films for MLC modeling and commissioning.
- This approach enhances the efficiency of MLC modeling and commissioning without sacrificing accuracy in radiation therapy.
