Alshanqity, M;
Nisbet, A;
(2016)
Dosimetric Performance of A-Si Electronic Portal Imaging Devices.
International Journal of Medical Physics, Clinical Engineering and Radiation Oncology
, 5
(2)
pp. 162-175.
10.4236/ijmpcero.2016.52018.
Preview |
Text
IJMPCERO_2016053110561153.pdf - Published Version Download (1MB) | Preview |
Abstract
The majority of EPID dosimetry literature discusses response linearity and the so-called image lag and ghosting effects despite the lack of a common definition of these quantities. However, the results of these studies are generally not consistent, and it is often difficult to compare the results from different studies. We present here a detailed study of the acquisition and readout characteristics of a-Si EPID and its dosimetric performance. EPID response was assessed over the range of 1 - 500 MU using different dose rates and integration times. In addition, a computer model was designed to simulate the EPID image formation with different dose, dose rate, and integration time combinations. All aspects of image processing and readout simulation were carried out using custom written MatLab codes. Two distinct signal profiles were observed depending on the delivered dose, dose rate and integration time combination. Total integrated signal (ST) is linear with the delivered dose. For dosimetry, image lag and ghosting effects mainly result in the residual signal (SR) that appears as delayed signal after the end of irradiation. At its maximum, SR is less than 2.5% of ST. The readout technique is such that it is impossible to measure SR accurately. SR is definable only when readout equilibrium occurs. Signal profiles provide a through and reliable description of the EPID response incorporating the dose, dose rate, integration time, and the residual signal. The definition of EPID signals based on this method shall provide an accurate universal EPID dosimetry framework.
| Type: | Article |
|---|---|
| Title: | Dosimetric Performance of A-Si Electronic Portal Imaging Devices |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.4236/ijmpcero.2016.52018 |
| Publisher version: | https://doi.org/10.4236/ijmpcero.2016.52018 |
| Language: | English |
| Additional information: | This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | EPID, Portal Dosimetry, Radiotherapy QA |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10106525 |
Archive Staff Only
 |
View Item |
