Basic Dose Response of Fluorescent Screen-based Potal Imaging Device / 대한방사선종양학회지
The Journal of the Korean Society for Therapeutic Radiology and Oncology
;
: 249-255, 1999.
Article
in English
| WPRIM
| ID: wpr-57929
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 ANDMETHODS:
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 systemRESULTS:
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
Full text:
Available
Index:
WPRIM (Western Pacific)
Language:
English
Journal:
The Journal of the Korean Society for Therapeutic Radiology and Oncology
Year:
1999
Type:
Article
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