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KMID : 1038720130240010041
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Progress in Medical Physics
2013 Volume.24 No. 1 p.41 ~ p.47
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The Influence of Volume Effect in 2D-array Ion Chamber on the Measurement of IMRT Dose Distribution
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Kim Sung -Joon
Lee Seoung-Jun
Park In-Kyu
Lee Jeong-Eun
Park Shin-Hyung
Seol Ki-Ho
Kim Jae-Chul
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Abstract
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We evaluated the influence of volume effect on the measurement of IMRT dose distribution by comparing a 2D-array ion chamber and other dosimeters. Matrix phantom which is a 2D-array ion chamber having volume effect was compared with beam image system and film for the measurement of dose distribution. Five intensity-modulated radiation therapy plans were created using five fields in thevirtual phantom. The measured dose distribution was compared with the calculated one by radiation treatment planning system and analysis program. We evaluated the conformity of dose distribution by calculating correlation coefficients and gamma values. The highest error rate of 1.3% was associated with matrix phantom in which volume effect in small field sizes was substantial.
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KEYWORD
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IMRT, Matrix phantom, Beam image system, Film, Volume effect
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