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J Korean Soc Ther Radiol Oncol > Volume 17(3); 1999 > Article
The Journal of the Korean Society for Therapeutic Radiology and Oncology 1999;17(3): 249-255.
Basic Dose Response of Fluorescent Screen-based Potal Imaging Device
Inhwan J Yeo, Yonas Yohannes, Yunping Zhu
1Department of Radiation Oncology, Samsung Medical Center,College of Medicine, Sung Kyun Kwan University, Seoul, Korea.
2Department of Radiation Oncology, St.Jude Children's Research Hospital, Memphis, USA.
ABSTRACT
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 and 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
Key Words: Portal dosimetry, Electronic portal imaging device (EPID), Light scattering
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