The imaging performance of compact Lu2 O3:Eu powdered phosphor screens

dc.contributor.author	Λιαπαρίνος, Παναγιώτης Φ.	el
dc.contributor.author	Κανδαράκης, Ιωάννης Σ.	el
dc.date.accessioned	2015-06-07T08:57:04Z
dc.date.available	2015-06-07T08:57:04Z
dc.date.issued	2015-06-07
dc.identifier.uri	http://hdl.handle.net/11400/15428
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://scitation.aip.org/content/aapm/journal/medphys	en
dc.subject	Monte Carlo method
dc.subject	Phosphor screens
dc.subject	Radiation detectors
dc.subject	X-ray mammography
dc.subject	Μέθοδος Μόντε Κάρλο
dc.subject	Οθόνες φωσφόρου
dc.subject	Ανιχνευτές ακτινοβολίας
dc.subject	Μαστογραφία με ακτίνες Χ
dc.title	The imaging performance of compact Lu2 O3:Eu powdered phosphor screens	en
heal.type	journalArticle
heal.secondaryTitle	Monte Carlo simulation for applications in mammography	en
heal.classification	Medicine
heal.classification	Technology
heal.classification	Ιατρική
heal.classification	Τεχνολογία
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh00006614
heal.classificationURI	http://zbw.eu/stw/descriptor/10470-6
heal.classificationURI	N/A-Ιατρική
heal.classificationURI	N/A-Τεχνολογία
heal.keywordURI	http://id.loc.gov/authorities/subjects/sh85087032
heal.identifier.secondary	DOI: http://dx.doi.org/10.1118/1.3121423
heal.language	en
heal.access	campus
heal.recordProvider	Σχολή Τεχνολογικών Εφαρμογών. Τμήμα Μηχανικών Βιοϊατρικής Τεχνολογίας Τ.Ε.	el
heal.publicationDate	2009
heal.bibliographicCitation	Liaparinos, P. and Kandarakis, I. (2009) The imaging performance of compact Lu2O3:Eu powdered phosphor screens: Monte Carlo simulation for applications in mammography. "Medical Physics", 36 (6), p. 1985-1997. Available from: http://scitation.aip.org/content/aapm/journal/medphys/36/6/10.1118/1.3121423 [Accessed: 07/07/2015].	en
heal.abstract	In medical mammographic imaging systems, one type of detector configuration, often referred to as indirect detectors, is based on a scintillator layer (phosphor screen) that converts the x-ray radiation into optical signal. The indirect detector performance may be optimized either by improving the structural parameters of the screen or by employing new phosphor materials with improved physical characteristics (e.g., x-ray absorption efficiency, intrinsic conversion efficiency, emitted light spectrum). Lu2 O3:Eu is a relatively new phosphor material that exhibits improved scintillating properties indicating a promising material for mammographic applications. In this article, a custom validated Monte Carlo program was used in order to examine the performance of compact Lu2 O3:Eu powdered phosphor screens under diagnostic mammography conditions (x-ray spectra: 28 kV Mo, 0.030 mm Mo and 32 kV W, 0.050 mm Rh). Lu2 O3:Eu screens of coating weight in the range between 20 and 40 mg/ cm2 were examined. The Monte Carlo code was based on a model using Mie-scattering theory for the description of light propagation within the phosphor. The overall performance of Lu2 O3:Eu powdered phosphor screens was investigated in terms of the (i) quantum detection efficiency, (ii) luminescence efficiency, (iii) compatibility with optical sensors, (iv) modulation transfer function, (v) the Swank factor, and (vi) zero-frequency detective quantum efficiency. Results were compared to the traditional rare-earth Gd2 O2 S:Tb phosphor material. The increased packing density and therefore the light extinction properties of Lu2 O3:Eu phosphor were found to improve the x-ray absorption (approximately up to 21% and 16% at 40 mg/ cm2 for Mo and W x-ray spectra, respectively), the spatial resolution (approximately 2.6 and 2.4 cycles/mm at 40 mg/ cm2 for Mo and W x-ray spectra, respectively), as well as the zero-frequency detective quantum efficiency (approximately up to 8% and 18% at 20 mg/ cm2 for Mo and W x-ray spectra, respectively) of the screens in comparison to the Gd2 O2 S:Tb screens. Data obtained by the simulations indicate that certain optical properties of Lu2 O3:Eu make this material a promising phosphor which, under appropriate conditions, could be considered for use in x-ray mammography imagers.	en
heal.publisher	Williamson, Jeffrey F.	en
heal.journalName	Medical Physics	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true