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Med Dosim. 2011 Spring;36(1):71-4. doi: 10.1016/j.meddos.2009.12.001. Epub 2010 Mar 26.

Monitoring linear accelerator output constancy using the PTW Linacheck.

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  • 1Radiotherapy Physics Section, Department of Medical Physics and Clinical Engineering, Churchill Hospital, Oxford Radcliffe NHS Hospitals Trust, Headington, Oxford, UK.


The PTW-Linacheck was assessed for its ability to monitor linear accelerator radiation output constancy. The key issues that were considered were the setup for daily output measurements, e.g., requirements for build-up and backscatter material, and the reproducibility and linearity of the device with linear accelerator output. An appropriate measurement setup includes a 10 × 10 cm field at 100 cm FSD, 5 cm backscatter, and no added build-up for 4 MeV electron beams, 1 cm added build-up for 6-16 MeV electron beams and 5 cm added build-up for 6-15 MV photon beams. Using this measurement setup, the dose linearity and short-term reproducibility were acceptable; however, the Linacheck should be recalibrated on a monthly basis to ensure acceptable long-term reproducibility.

Copyright © 2011 American Association of Medical Dosimetrists. Published by Elsevier Inc. All rights reserved.

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