Role of the activator in the performance of scintillators used in x-ray imaging

dc.contributor.author	Κανδαράκης, Ιωάννης Σ.	el
dc.contributor.author	Κάβουρας, Διονύσης Α.	el
dc.date.accessioned	2015-05-05T11:50:40Z
dc.date.available	2015-05-05T11:50:40Z
dc.date.issued	2015-05-05
dc.identifier.uri	http://hdl.handle.net/11400/9737
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/us/	*
dc.source	http://www.sciencedirect.com/science/article/pii/S0969804300003365	en
dc.subject	Medical scintillators
dc.subject	Scintillator efficiency
dc.subject	Ιατρικοί σπινθηριστές
dc.subject	Αποτελεσματικότητα σπινθηριστή
dc.title	Role of the activator in the performance of scintillators used in x-ray imaging	en
heal.type	journalArticle
heal.classification	Science
heal.classification	Physics
heal.classification	Επιστήμες
heal.classification	Φυσική
heal.classificationURI	http://skos.um.es/unescothes/C03532
heal.classificationURI	http://skos.um.es/unescothes/C02994
heal.classificationURI	N/A-Επιστήμες
heal.classificationURI	N/A-Φυσική
heal.identifier.secondary	doi:10.1016/S0969-8043(00)00336-5
heal.language	en
heal.access	campus
heal.recordProvider	Τ.Ε.Ι. Αθήνας. Σχολή Τεχνολογικών Εφαρμογών. Τμήμα Μηχανικών Βιοϊατρικής Τεχνολογίας Τ.Ε.	el
heal.publicationDate	2001
heal.bibliographicCitation	Kandarakis, I. and Cavouras, C. (May 2001). Role of the activator in the performance of scintillators used in x-ray imaging. Applied Radiation and Isotopes. 54(5). pp. 821-831. Elsevier B.V: 2001. Available from: http://www.sciencedirect.com/science/article/pii/S0969804300003365 [Accessed 05/02/2001]	en
heal.abstract	The aim of this study was to investigate how the activator type affects the performance of X-ray scintillators. To this aim the behavior of scintillator materials was modeled under X-ray excitation conditions, similar to those used in imaging techniques. The model describes the light emission efficiency, the spectral compatibility with optical detectors (films, photodiodes, and photocathodes), and the imaging capabilities of a scintillating layer. Using the model equations the role of the activator type in scintillator performance was examined. Activators affect some important properties of materials, like the intrinsic X-ray to light conversion efficiency, the spectrum of the emitted light, and the light attenuation coefficients. The performances of a high-efficiency material (Gd2O2S) combined with either Tb3+ or Eu3+ activators were compared. Results showed that the terbium-activated material exhibited high emission efficiency (number of emitted photons per incident X-ray) and modulation transfer function (spatial resolution and image contrast) while the europium activated material showed slightly better signal-to-noise ratio properties at low spatial frequencies. Both materials were found to exhibit high spectral compatibility with currently used modern optical detectors. In conclusion, the choice of activator may improve spectral compatibility, but care must be taken because it may also alter emission efficiency and image quality.	en
heal.publisher	Elsevier B.V.	en
heal.journalName	Applied Radiation and Isotopes	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true