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BioMed Research International
Volume 2013 (2013), Article ID 349437, 8 pages
http://dx.doi.org/10.1155/2013/349437
Research Article

Dose Verification in Intensity Modulation Radiation Therapy: A Fractal Dimension Characteristics Study

1Department of Information Engineering, I-Shou University, No. 1, Sec. 1, Syuecheng Road, Dashu District, Kaohsiung City 84001, Taiwan
2Department of Radiation Oncology, E-Da Hospital, Kaohsiung, Taiwan
3Department of medical Imaging and Radiological Science, Central Taiwan University of Science and Technology, Taichung, Taiwan
4Department of Medical Imaging and Radiological Sciences, I-Shou University, No. 1, Sec. 1, Syuecheng Road, Dashu District, Kaohsiung City 84001, Taiwan

Received 25 April 2013; Accepted 3 June 2013

Academic Editor: Ching Chong Jack Yang

Copyright © 2013 Jia-Ming Wu 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.

Abstract

Purpose. This study describes how to identify the coincidence of desired planning isodose curves with film experimental results by using a mathematical fractal dimension characteristic method to avoid the errors caused by visual inspection in the intensity modulation radiation therapy (IMRT). Methods and Materials. The isodose curves of the films delivered by linear accelerator according to Plato treatment planning system were acquired using Osiris software to aim directly at a single interested dose curve for fractal characteristic analysis. The results were compared with the corresponding planning desired isodose curves for fractal dimension analysis in order to determine the acceptable confidence level between the planning and the measurement. Results. The film measured isodose curves and computer planning curves were deemed identical in dose distribution if their fractal dimensions are within some criteria which suggested that the fractal dimension is a unique fingerprint of a curve in checking the planning and film measurement results. The dose measured results of the film were presumed to be the same if their fractal dimension was within 1%. Conclusions. This quantitative rather than qualitative comparison done by fractal dimension numerical analysis helps to decrease the quality assurance errors in IMRT dosimetry verification.