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BioMed Research International
Volume 2015, Article ID 934387, 5 pages
Research Article

A Novel Simple Phantom for Verifying the Dose of Radiation Therapy

1Health Physics Division, Institute of Nuclear Energy Research, Longtan 325, Taiwan
2Department of Radiation Oncology, Koo Foundation Sun Yat-Sen Cancer Center, Taipei 112, Taiwan
3Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei 112, Taiwan
4Department of Anesthesiology, China Medical University Hospital, Taichung 404, Taiwan
5Graduate Institute of Clinical Medical Science, China Medical University, Taichung 404, Taiwan
6School of Medical Laboratory Science and Biotechnology, Taipei Medical University, Taipei 110, Taiwan
7School of Medicine, Tzu Chi University, Hualien 970, Taiwan
8Biophotonics and Molecular Imaging Research Center, National Yang-Ming University, Taipei 112, Taiwan

Received 3 June 2014; Revised 21 October 2014; Accepted 22 October 2014

Academic Editor: Tsair-Fwu Lee

Copyright © 2015 J. H. Lee et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A standard protocol of dosimetric measurements is used by the organizations responsible for verifying that the doses delivered in radiation-therapy institutions are within authorized limits. This study evaluated a self-designed simple auditing phantom for use in verifying the dose of radiation therapy; the phantom design, dose audit system, and clinical tests are described. Thermoluminescent dosimeters (TLDs) were used as postal dosimeters, and mailable phantoms were produced for use in postal audits. Correction factors are important for converting TLD readout values from phantoms into the absorbed dose in water. The phantom scatter correction factor was used to quantify the difference in the scattered dose between a solid water phantom and homemade phantoms; its value ranged from 1.084 to 1.031. The energy-dependence correction factor was used to compare the TLD readout of the unit dose irradiated by audit beam energies with 60Co in the solid water phantom; its value was 0.99 to 1.01. The setup-condition factor was used to correct for differences in dose-output calibration conditions. Clinical tests of the device calibrating the dose output revealed that the dose deviation was within 3%. Therefore, our homemade phantoms and dosimetric system can be applied for accurately verifying the doses applied in radiation-therapy institutions.