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dc.contributor.authorAnvari, A.en
dc.contributor.authorAghamiri, S.en
dc.contributor.authorMahdavi, S.en
dc.contributor.authorAlaei, P.en
dc.contributor.authorMohammadi, M.en
dc.identifier.citationJournal of Radiotherapy in Practice, 2015; 14(1):27-34en
dc.description.abstractThe aim of this work was to evaluate dose response of fluoroscopic EPID for transit dosimetry applications. Properties studied included warm up time, build-up thickness evaluation, dose history, linearity, stability, and short and long-term reproducibility of EPID response, as well as field size dependence. Pixel value matrices of electronic portal images in DICOM format were analysed in central and 8 off axis points using customised written codes in Matlab. In order to do this, nine 26×26 pixel matrices were selected as regions of interest, the regions represented by these arrays were 1×1 and 0·65×0·65 cm2 at the EPID and isocentre level, respectively. Necessary warm up time for stable operation of EPID is 30 minutes, and there is no need for extra build-up layer to increase the dose response. Linearity tests indicate charged coupled device camera of EPID saturates at 50 cGy level, and does not have linear relationship with dose. Reproducibility and stability of the measurements were excellent and the detector showed same signal with a maximum deviation of <0·3% both in short and long terms. Results of dosimetric evaluation have shown the TheraView fluoroscopic EPID can be used for transit dosimetry purposes.en
dc.description.statementofresponsibilityAkbar Anvari, Seyed Mahmoud Reza Aghamiri, Seyed Rabi Mahdavi, Parham Alaei, Mohammad Mohammadien
dc.publisherCambridge University Pressen
dc.rights© Cambridge University Press 2014en
dc.subjectdose response; dosimetry; epid; portal imagingen
dc.titleDosimetric properties of fluoroscopic EPID for transit dosimetryen
dc.typeJournal articleen
pubs.library.collectionIPAS publicationsen
dc.identifier.orcidMohammadi, M. [0000-0002-2393-8849]en
Appears in Collections:IPAS publications

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