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Dosimetric Characterization of the Dual Layer MLC System for an O-Ring Linear Accelerator
Michele M Kim1, Douglas Bollinger1, Chris Kennedy1
1Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA, USA.
Technology in Cancer Research & Treatment
|November 12, 2019
Summary
Varian
Area of Science:
- Medical Physics
- Radiation Oncology
Background:
- Varian's Halcyon linear accelerator features a novel jawless design.
- It incorporates a dual-layer multileaf collimator (MLC) system for improved performance.
Purpose of the Study:
- To characterize the dosimetric properties of the Halcyon's dual-layer MLC system.
- Evaluate transmission, dosimetric leaf gap, and tongue-and-groove effects.
Main Methods:
- Utilized ionization chambers, diode arrays, and an electronic portal imaging device.
- Measured MLC transmission, penumbra, dosimetric leaf gap, and tongue-and-groove effects.
Main Results:
- Dual-layer MLC transmission was 0.008%; individual banks showed 0.4% transmission.
- Penumbra width ranged from 2.7-3.0 mm at dmax.
- Dosimetric leaf gap values varied for proximal, distal, and combined MLC banks.
Conclusions:
- The Halcyon's dual-layer MLC system demonstrates low transmission and sharp penumbra.
- Characterization provides essential data for clinical implementation and quality assurance.
