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Volume 16, Number 6, 2011

A study on dosimetric properties of electronic portal imaging device and its use as a quality assurance tool in Volumetric Modulated Arc Therapy

Prabakar Sukumar, Sriram Padmanaban, Prakash Jeevanandam, S.A. Syam Kumar,
Vivekanandan Nagarajan


Aim: In this study, the dosimetric properties of the electronic portal imaging device were
examined and the quality assurance testing of Volumetric Modulated Arc Therapy was
Background: RapidArc involves the variable dose rate, leaf speed and the gantry rotation. The
imager was studied for the effects like dose, dose rate, field size, leaf speed and sag during
gantry rotation.
Materials and methods:
A Varian RapidArc machine equipped with 120 multileaf collimator
and amorphous silicon detector was used for the study. The characteristics that are variable
in RapidArc treatment were studied for the portal imager. The accuracy of a dynamicmultileaf
collimator position at different gantry angles and during gantry rotation was examined
using the picket fence test. The control of the dose rate and gantry speed was verified using
a test field irradiating seven strips of the same dose with different dose rate and gantry
speeds. The control over leaf speed during arc was verified by irradiating four strips of different
leaf speeds with the same dose in each strip. To verify the results, the RapidArc test
procedure was compared with the X-Omat film and verified for a period of 6 weeks using
Results: The effect of gantry rotation on leaf accuracy was minimal. The dose in segments
showed good agreement with mean deviation of 0.8% for dose rate control and 1.09% for
leaf speed control over different gantry speeds.
Conclusion: The results provided a precise control of gantry speed, dose rate and leaf speeds
during RapidArc delivery and were consistent over 6 weeks.

Signature: Rep Pract Oncol Radiother, 2011; 16(6) : 248-255

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