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KMID : 0357520080310020183
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Journal of Radiological Science and Technology
2008 Volume.31 No. 2 p.183 ~ p.188
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Feasibility of Two Dimensional Ion Chamber Array for a Linac Periodic Quality Assurance
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Lee Jeong-Woo
Hong Se-Mie
Park Byung-Moon
Kang Min-Young
Kim You-Hyun
Suh Tae-Suk
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Abstract
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Aim of this study is to investigate the feasibility of 2D ion chamber array as a substitute of the water phantom system in a periodic Linac QA. For the feasibility study, a commercial ion chamber matrix was used as a substitute of the water phantom in the measurement for a routine QA beam properties. The device used in this study was the I’m RT MatriXX (Wellhofer Dosimetrie, Germany). The MatriXX consists of a 1,020 vented ion chamber array, arranged in matrix. Each ion chamber has a volume of , spacing of 0.762 cm. We investigated dosimetric parameters such as dose symmetry, energy (), and absolute dose for comparing with the water phantom data with a Farmer-type ionization chamber (FC65G, Wellhofer Dosimetrie, Germany). For the MatriXX measurements, we used the white polystyrene phantom () and also considered the intrinsic layer (, t: 0.36 cm) of MatriXX to be equivalent to water depth. In the preliminary study of geometrical QA using MatriXX, the rotation axis of collimator and half beam junction test were included and compared with film measurements. Regarding the dosimetrical QA, the MatriXX has shown good agreements within compared to the water phantom measurements. In the geometrical test, the data from MatriXX were comparable with those from the films. In conclusion, the MatriXX is a good substitute for water phantom system and film measurements. In addition, the results indicate that the MatriXX as a cost-effective novel QA tool to reduce time and personnel power.
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KEYWORD
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2D ion chamber array (MatriXX), quality assurance, symmetry, energy, absolute dose
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