NDLI: Dose-Response Function of an Amorphous Silicon Electronic Portal Imaging Device

Content Provider	IEEE Xplore Digital Library
Author	Wenting Lu Linghong Zhou Jun Yang Xin Zhen
Copyright Year	2010
Abstract	Electronic Portal Imaging Devices (EPID) are not only suited for patient set-up verification and detection of organ motion but can also be used for dosimetric verification of treatment techniques or in-vivo dosimetry. The aim of this work is to develop a mapping function which describes the relationship between the pixel value and exit dose of an amorphous silicon (a-Si) EPID. The dose-response function depends on field size, source-detector distance (SDD) and the monitor unit (MU) setting. To experimentally derive the coefficients, EPID data and ionization chamber in a mini-phantom, which are used as reference data, were fit and compared on the central axis for detector distances between 105cm to 125cm from the source, radiation field sizes from 5cm×5cm to 15cm×15cm and monitor unit settings of 50,100,150.All measurements were done using 6 MV photon beams at a Varian Clinac 23EX medical accelerator equipped with the Varian aS1000 a-Si EPID system. Each dose profile was evaluated by comparing the EPID with the ionization chamber measurement. The comparisons indicate a maximum deviation was ＜ 6%. It is found that accuracies of better than 1% could be obtained if field size ≥10cm×10cm, because the effect of the lateral scatter was bigger in small field size. It is concluded that, using our model, EPID measurements can be used to estimate accurate two-dimensional dose distribution in a 6MV beam with 300MU/min.
Starting Page	1
Ending Page	4
File Size	298266
Page Count	4
File Format	PDF
ISBN	9781424447121
ISSN	21517622
DOI	10.1109/ICBBE.2010.5515751
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-18
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radiation monitoring Ionizing radiation Radiation detectors Medical treatment Amorphous silicon Motion detection Dosimetry Ionization chambers Biomedical monitoring Portals
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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