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dc.contributor.authorMcDermott, LN
dc.contributor.authorNijsten, SMJJG
dc.contributor.authorSonke, J-J
dc.contributor.authorPartridge, M
dc.contributor.authorvan Herk, M
dc.contributor.authorMijnheer, BJ
dc.date.accessioned2018-07-26T14:56:04Z
dc.date.issued2006-07
dc.identifier.citationMedical physics, 2006, 33 (7), pp. 2448 - 2451
dc.identifier.issn0094-2405
dc.identifier.urihttps://repository.icr.ac.uk/handle/internal/2177
dc.identifier.eissn2473-4209
dc.identifier.doi10.1118/1.2207318
dc.description.abstractMany studies have reported dosimetric characteristics of amorphous silicon electronic portal imaging devices (EPIDs). Some studies ascribed a non-linear signal to gain ghosting and image lag. Other reports, however, state the effect is negligible. This study compares the signal-to-monitor unit (MU) ratio for three different brands of EPID systems. The signal was measured for a wide range of monitor units (5-1000), dose-rates, and beam energies. All EPIDs exhibited a relative under-response for beams of few MUs; giving 4 to 10% lower signal-to-MU ratios relative to that of 1000 MUs. This under-response is consistent with ghosting effects due to charge trapping.
dc.formatPrint
dc.format.extent2448 - 2451
dc.languageeng
dc.language.isoeng
dc.subjectHumans
dc.subjectSilicon
dc.subjectRadiographic Image Interpretation, Computer-Assisted
dc.subjectRadiotherapy Dosage
dc.subjectCalibration
dc.subjectReproducibility of Results
dc.subjectEquipment Design
dc.subjectRadiometry
dc.subjectPhantoms, Imaging
dc.subjectTime Factors
dc.subjectImage Processing, Computer-Assisted
dc.subjectSoftware
dc.titleComparison of ghosting effects for three commercial a-Si EPIDs.
dc.typeJournal Article
rioxxterms.versionofrecord10.1118/1.2207318
rioxxterms.licenseref.startdate2006-07
rioxxterms.typeJournal Article/Review
dc.relation.isPartOfMedical physics
pubs.issue7
pubs.notesNot known
pubs.organisational-group/ICR
pubs.organisational-group/ICR/Primary Group
pubs.organisational-group/ICR/Primary Group/ICR Divisions
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Closed research teams
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Closed research teams/Radiotherapy Physics Functional Imaging
pubs.organisational-group/ICR
pubs.organisational-group/ICR/Primary Group
pubs.organisational-group/ICR/Primary Group/ICR Divisions
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Closed research teams
pubs.organisational-group/ICR/Primary Group/ICR Divisions/Closed research teams/Radiotherapy Physics Functional Imaging
pubs.publication-statusPublished
pubs.volume33
pubs.embargo.termsNot known
icr.researchteamRadiotherapy Physics Functional Imagingen_US
dc.contributor.icrauthorPartridge, Michaelen


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