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KMID : 0357520080310040407
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Journal of Radiological Science and Technology
2008 Volume.31 No. 4 p.407 ~ p.413
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A Study of Peripheral Doses for Physical Wedge and Dynamic Wedge
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Ko Shin-Gwan
Han Dong-Kyoon
Park Heung-Deuk
Lee Je-Hee
Min Je-Sun
Na Kyoung-Su
Park Heung-Deuk
Han Dong-Kyoon
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Abstract
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Measurements of the peripheral dose were performed using a 2D array ion chamber and solid water phantom for a , source-surface distance (SSD) 90cm, 6 and 15MV photon beam at depths of 0.5cm, 5cm through . Measurements of peripheral dose at 0.5cm and 5cm depths were performed from 1cm to 5cm outside of fields for the dynamic wedge and physical wedge , . For 6MV photon beam, the average peripheral dose of dynamic wedge were lower by 1.4% and 0.1% than that of physical wedge For 15MV photon beam, the peripheral dose of dynamic wedge were lower by maximum 1.6% that of physical wedge. The results showed that dynamic wedge can reduce scattered dose of clinical organ close to the field edge. The wedge systems produce different peripheral dose that should be considered in properly choosing a wedge system for clinical use.
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KEYWORD
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physical wedge, dynamic wedge, peripheral dose
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