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¼¶±¤ÆÇÀ» »ç¿ëÇÏ´Â Á¶»ç¹®¿µ»ó±â±¸ÀÇ ±âº»ÀûÀÎ ¼±·®¹ÝÀÀ¼º Basic Dose Response of Fluorescent Screen-based Portal Imaging Device

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USA St. Jude Children's Research Hospital Department of Radiation Oncology
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USA St. Jude Children's Research Hospital Department of Radiation Oncology

Abstract

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Purpose : The purpose of this study is to investigate fundamental aspects of the dose
response of fluorescent screen-based electronic portal imaging devices (EPIDS).
Materials and Methods : We acquired scanned signal across portal planes as we
varied the radiation that entered the EPID by changing the thickness arid anatomy of
the phantom as well as the air gap between the phantom and the EPID. In addition, we
simulated the relative contribution of the scintillation light signal in the EPID system.
Results : We have shown that the dose profile across portal planes is a function of
the air gap and phantom thickness. We have also found that depending on the density
change within the phantom geometry, errors associated with dose response based on the
EPID scan can be as high as 7%. We also found that scintillation light scattering within
the EPID system is an important source of error.
Conclusion : This study revealed and demonstrated fundamental characteristics of dose
response of EPID, as relative to that of ion chambers. This study showed that EPID
based on fluorescent screen cannot be an accurate dosimetry system.

Å°¿öµå

Á¶»ç¹®¼±·®ÃøÁ¤¹ý; Á¶»ç¹®¿µ»ó±â±¸; ºûÀÇ »ê¶õ; Portal dosimetry; Electronic portal imaging device (EPID); Light scattering;

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