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Summary

Mobius FX software offers efficient quality assurance for intensity-modulated radiation therapy (IMRT) by verifying patient doses using treatment logs. This study found Mobius FX comparable to traditional methods like ArcCheck for VMAT plan QA.

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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.