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KMID : 1164220070190010001
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Journal of Korean Society for Radiotherapeutic Technology
2007 Volume.19 No. 1 p.1 ~ p.5
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Analyses of the Setup Errors using on Board Imager (OBI)
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Kim Jong-Deok
Lee Haeng-O
You Jae-Man
Ji Dong-Hwa
Song Ju-Young
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Abstract
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Purpose: As increasing complexity of modern radiotherapy technique, more developing dosimetry is required. Polymer gel dosimeters offer a wide range of potential applications with high resolution and assured quality in the thee-dimensional verification of complex dose distribution such as intensity-modulated radiotherapy (IMRT). The purpose of this study is to find the most sensitive and suitable gel as a dosimeter by varying its composition ratio and its condition such as temperature during manufacturing.
Materials and Methods: Each polymer gel with various ratio of composition was irradiated with the same amount of photon beam accordingly. Various polymer gels were analyzed and compared using a dedicated software written in visual C++ which converts TE images to R2 map images. Their sensitivities to the photon beam depending on their composition ratio were investigated.
Results: There is no dependence on beam energy nor dose rate, and calibration curve is linear.
Conclusion: The polymer gel dosimeter developed by using anti-oxidant in this study proved to be suitable for dosimetry.
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KEYWORD
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OBI (on board imager), setup error, IGRT (image guided radiation therapy)
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