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Development of Dual-Window Phantom for Output Measurement of Medical Linacs  

Jeong, Dong Hyeok (Research Center, Dongnam Inst. of Radiological and Medical Sciences)
Kwak, Dong Won (Research Center, Dongnam Inst. of Radiological and Medical Sciences)
Moon, Young Min (Research Center, Dongnam Inst. of Radiological and Medical Sciences)
Kang, Yeong-Rok (Research Center, Dongnam Inst. of Radiological and Medical Sciences)
Kim, Jeung Kee (Research Center, Dongnam Inst. of Radiological and Medical Sciences)
Lee, Man Woo (Research Center, Dongnam Inst. of Radiological and Medical Sciences)
Publication Information
Progress in Medical Physics / v.23, no.4, 2012 , pp. 229-233 More about this Journal
Abstract
A small water phantom (dual-window phantom) was developed to improve the output measurement efficiency of medical linacs. This phantom is suitable for determining the quality index and output dose for high-energy photon beams. The phantom has two opposite windows and two independently rotating axes. The two axes measure the tissue phantom ratio (TPR) and the percentage depth dose (PDD) simply without requiring chamber movement by rotating the phantom around its axis. High-energy photon beams from a Co-60 irradiator and a medical linac were used to evaluate the phantom. The measured quality index is in good agreement with the reference values; the measured and reference values are within 0.2% of each other for the Co-60 gamma rays and within 1.4% for 6 and 10 MV X-rays. This phantom is more practical for routine output measurements, resulting in the prevention of potential human errors.
Keywords
Dual-window phantom; Output measurement; Beam quality;
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