Evaluation of high packing density powder X-ray screens by Monte Carlo methods

dc.contributor.author	Λιαπαρίνος, Παναγιώτης Φ.	el
dc.contributor.author	Κανδαράκης, Ιωάννης Σ.	el
dc.contributor.author	Κάβουρας, Διονύσης Α.	el
dc.contributor.author	Καλύβας, Νεκτάριος Ι.	el
dc.contributor.author	Δελής, Χ.	el
dc.date.accessioned	2015-01-20T12:46:14Z
dc.date.available	2015-01-20T12:46:14Z
dc.date.issued	2015-01-20
dc.identifier.uri	http://hdl.handle.net/11400/4319
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.elsevier.com	en
dc.subject	X-ray imaging
dc.subject	Phosphor screens
dc.subject	Απεικόνιση με ακτίνες Χ
dc.subject	Οθόνες φωσφόρου
dc.title	Evaluation of high packing density powder X-ray screens by Monte Carlo methods	en
heal.type	journalArticle
heal.generalDescription	Proceedings of the 10 th International Symposium on Radiation Physics-ISRP 10	en
heal.classification	Medicine
heal.classification	Physics
heal.classification	Ιατρική
heal.classification	Φυσική
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh00006614
heal.classificationURI	http://skos.um.es/unescothes/C02994
heal.classificationURI	N/A-Ιατρική
heal.classificationURI	N/A-Φυσική
heal.contributorName	Παναγιωτάκης, Γεώργιος Σ.	el
heal.identifier.secondary	doi:10.1016/j.nima.2007.05.070
heal.language	en
heal.access	free
heal.recordProvider	Τ.Ε.Ι. Αθήνας. Σχολή Τεχνολογικών Εφαρμογών. Τμήμα Μηχανικών Βιοϊατρικής Τεχνολογίας Τ.Ε.	el
heal.publicationDate	2007
heal.bibliographicCitation	Liaparinos, P., Kandarakis, I., Cavouras, D., Kalivas, N., Delis, H., et al. (September 2007). Evaluation of high packing density powder X-ray screens by Monte Carlo methods. Nuclear Instruments and Methods in Physics Research A. 580(1). pp. 427–429. Elsevier Science Ltd. Available from: http://www.sciencedirect.com [Accessed 16/05/2007]	en
heal.abstract	Phosphor materials are employed in intensifying screens of both digital and conventional X-ray imaging detectors. High packing density powder screens have been developed (e.g. screens in ceramic form) exhibiting high-resolution and light emission properties, and thus contributing to improved image transfer characteristics and higher radiation to light conversion efficiency. For the present study, a custom Monte Carlo simulation program was used in order to examine the performance of ceramic powder screens, under various radiographic conditions. The model was developed using Mie scattering theory for the description of light interactions, based on the physical characteristics (e.g. complex refractive index, light wavelength) of the phosphor material. Monte Carlo simulations were carried out assuming: (a) X-ray photon energy ranging from 18 up to 49 keV, (b) Gd2O2S:Tb phosphor material with packing density of 70% and grain size of 7 μm and (c) phosphor thickness ranging between 30 and 70 mg/cm2. The variation of the Modulation Transfer Function (MTF) and the Luminescence Efficiency (LE) with respect to the X-ray energy and the phosphor thickness was evaluated. Both aforementioned imaging characteristics were shown to take high values at 49 keV X-ray energy and 70 mg/cm2 phosphor thickness. It was found that high packing density screens may be appropriate for use in medical radiographic systems.	en
heal.publisher	Elsevier Science Ltd	en
heal.journalName	Nuclear Instruments and Methods in Physics Research A	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true