Monte Carlo study on the imaging performance of powder Lu2SiO5: Ce phosphor screens under x-ray excitation

dc.contributor.author	Λιαπαρίνος, Παναγιώτης Φ.	el
dc.contributor.author	Κανδαράκης, Ιωάννης	el
dc.contributor.author	Κάβουρας, Διονύσης Α.	el
dc.contributor.author	Δελής, Χάρης Β.	el
dc.contributor.author	Παναγιωτάκης, Γεώργιος Σ.	el
dc.date.accessioned	2015-04-28T16:43:03Z
dc.date.available	2015-04-28T16:43:03Z
dc.date.issued	2015-04-28
dc.identifier.uri	http://hdl.handle.net/11400/9196
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.subject	Ανιχνευτές ακτινοβολίας
dc.subject	Οθόνες
dc.subject	Μόντε Κάρλο
dc.subject	Radiation detectors
dc.subject	LSO
dc.subject	Phosphor screens
dc.subject	Monte Carlo
dc.title	Monte Carlo study on the imaging performance of powder Lu2SiO5: Ce phosphor screens under x-ray excitation	en
heal.type	journalArticle
heal.secondaryTitle	comparison with Gd2O2S: Tb screens	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.identifier.secondary	DOI.org/10.1118/1.2724065
heal.language	en
heal.access	free
heal.recordProvider	Τεχνολογικό Εκπαιδευτικό Ίδρυμα Αθήνας. Σχολή Τεχνολογικών Εφαρμογών. Tμήμα Μηχανικών Βιοϊατρικής Τεχνολογίας T.E.	el
heal.publicationDate	2007
heal.bibliographicCitation	Liaparinos, P.F., Kandrakis, I.S., Cavouras, D.A., Dellis, H.B. and Panayiotakis, G.S. (2007) Monte Carlo study on the imaging performance of powder Lu2SiO5: Ce phosphor screens under x-ray excitation: comparison with Gd2O2S: Tb screens. Medical physics, 34 (5). pp.1724-1733.	en
heal.abstract	Lu2SiO5:Ce LSO scintillator is a relatively new luminescent material which has been successfully applied in positron emission tomography systems. Since it has been recently commercially available in powder form, it could be of value to investigate its performance for use in x-ray projection imaging as both physical and scintillating properties indicate a promising material for such applications. In the present study, a custom and validated Monte Carlo simulation code was used in order to examine the performance of LSO, under diagnostic radiology mammography and general radiography conditions. The Monte Carlo code was based on a model using Mie scattering theory for the description of light attenuation. Imaging characteristics, related to image brightness, spatial resolution and noise of LSO screens were predicted using only physical parameters of the phosphor. The overall performance of LSO powder phosphor screens was investigated in terms of the: i quantum detection efficiency ii emitted K-characteristic radiation iii luminescence efficiency iv modulation transfer function v Swank factor and vi zero-frequency detective quantum efficiency DQE 0 . Results were compared to the traditional rare-earth Gd2O2S:Tb GOS phosphor material. The relative luminescence efficiency of LSO phosphor was found inferior to that of GOS. This is due to the lower intrinsic conversion efficiency of LSO 0.08 instead of 0.15 of GOS and the relatively high light extinction coefficient mext of this phosphor 0.239 m−1 instead of 0.218 m−1 for GOS . However, the property of increased light extinction combined with the rather sharp angular distribution of scattered light photons anisotropy factor g=0.624 for LSO instead of 0.494 for GOS reduce lateral light spreading and improve spatial resolution. In addition, LSO screens were found to exhibit better x-ray absorption as well as higher signal to noise transfer properties in the energy range from 18 keV up to 50.2 keV e.g. DQE 0 =0.62 at 18 keV and for 34 mg/cm2, instead of 0.58 for GOS . The results indicate that certain optical properties of LSO optical extinction coefficient, scattering anisotropy factor combined with the relatively high x-ray coefficients, make this material a promising phosphor which, under appropriate conditions, could be considered for use in x-ray projection imaging detectors.	en
heal.journalName	Medical physics	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true