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Published on: May 9, 2014
Response of the ArcCHECK® device at 6 MV and 15 MV for VMAT and IMRT quality control
Miguel Jiménez-Melguizo1, Miguel Espinosa2, Joaquín Montes2
1Servicio de Radiofísica y Protección Radiológica, Hospital Universitario "Virgen de las Nieves", E-18014 Granada, Spain; Unidad de Radiofísica, Hospital Universitario Clínico "San Cecilio", E-18016 Granada, Spain.
Purpose:
To study the response of the ArcCHECK® device as VMAT and IMRT verification system.
Methods:
Various tests analyzing the linearity, the repeatability and the angular dependence of the device response, its dependence with the pulse repetition rate and the leakage losses were performed. The long-term response in dose measurements and the uniformity of the detectors conforming the system were controlled using a statistical process control program. The Elekta Infinity™ 6 and 15MV photon beams were used.
Results:
The device showed excellent repeatability and linearity. The differences between the responses obtained for any pair of angular incidences were less than 2%. The absorbed dose increased by 3% when the pulse repetition rate varied from 50 to 600MU/min. Results are in overall agreement with those found in previous works for the ArcCHECK®, in which a reduced number of the device diodes were analyzed, and for the MapCheck®, an older 2D device that used the same diodes. Charge losses were found to be negligible except for some of the diodes of the device. The statistical process control program is a very useful tool to control the correct functioning of the device in the long term.
Conclusions:
The results of the analysis carried out indicate that the working and stability conditions of the ArcCHECK® device are adequate for its purpose. The dependence with the pulse repetition rate should be considered when VMAT or similar treatments are evaluated. A control program for the statistical monitoring of the device would be desirable and useful.
