Clinical experience with machine log file software for volumetric-modulated arc therapy techniques.

Area of Science:

• Medical Physics
• Radiation Oncology
• Quality Assurance

Background:

• Intensity-modulated radiation therapy (IMRT) and volumetric-modulated arc therapy (VMAT) require rigorous quality assurance (QA) to ensure accurate patient dose delivery.
• Traditional QA methods can be time-consuming and may require specific device positioning.
• There is a need for efficient and accurate QA tools in radiation therapy.

Purpose of the Study:

• To evaluate the performance of Mobius FX, a novel software module for IMRT/VMAT QA.
• To compare the accuracy and efficiency of Mobius FX against traditional QA methods (ArcCheck) and the treatment planning system (TPS).

Main Methods:

• Thirty VMAT plans delivered on a Varian TrueBeam linac were analyzed.
• Mobius FX was used to calculate and verify 3D doses, utilizing linac treatment logs.
• Comparisons were made between Mobius FX, ArcCheck, and the TPS using gamma analysis (3%-3 mm and 2%-2 mm criteria).

Main Results:

• Mobius FX demonstrated high agreement with the TPS, with average gamma values of 99.96% (3%-3 mm) and 98.80% (2%-2 mm).
• Results from Mobius FX closely matched those obtained using traditional methods (ArcCheck).
• Profile analysis confirmed comparable results between Mobius FX and traditional QA methods.

Conclusions:

• Mobius FX provides a reliable and efficient method for pre-treatment patient-specific QA in VMAT.
• The software's ability to use linac treatment logs without device positioning enhances its practicality.
• Mobius FX is a viable alternative to traditional QA methods, offering comparable accuracy.