The Monte Carlo evaluation of noise and resolution properties of granular phosphor screens

dc.contributor.author	Λιαπαρίνος, Παναγιώτης Φ.	el
dc.contributor.author	Κανδαράκης, Ιωάννης Σ.	el
dc.date.accessioned	2015-06-07T11:22:22Z
dc.date.available	2015-06-07T11:22:22Z
dc.date.issued	2015-06-07
dc.identifier.uri	http://hdl.handle.net/11400/15455
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://iopscience.iop.org/0031-9155/	en
dc.subject	Computer Simulation
dc.subject	Computer-aided design
dc.subject	equipment design
dc.subject	Equipment Failure Analysis
dc.subject	Image Interpretation
dc.subject	Computer-Assisted
dc.subject	statistical models
dc.subject	Monte Carlo method
dc.subject	X-Ray Intensifying Screens
dc.subject	Προσομοίωση υπολογιστή
dc.subject	Σχεδιασμός με τη βοήθεια υπολογιστή
dc.subject	Σχεδιασμός εξοπλισμού
dc.subject	Ανάλυση βλάβης εξοπλισμού
dc.subject	Ερμηνεία της εικόνας
dc.subject	Υπολογιστική βοήθεια
dc.subject	Στατιστικά μοντέλα
dc.subject	Μέθοδος Μόντε Κάρλο
dc.subject	Ενισχυτικές οθόνες με ακτίνες Χ
dc.title	The Monte Carlo evaluation of noise and resolution properties of granular phosphor screens	en
heal.type	journalArticle
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/sh2002006170
heal.keywordURI	http://lod.nal.usda.gov/21008
heal.keywordURI	http://lod.nal.usda.gov/53192
heal.keywordURI	http://id.loc.gov/authorities/subjects/sh85087032
heal.identifier.secondary	DOI: 10.1088/0031-9155/54/4/003
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 Monte Carlo evaluation of noise and resolution properties of granular phosphor screens. "Physics in Medicine and Biology", 54 (4), p. 859-874. Available from: http://iopscience.iop.org/0031-9155/54/4/003/ [Accessed: 06/07/2015].	en
heal.abstract	The imaging performance of phosphor screens, used as x-ray detectors in diagnostic medical imaging systems, is affected by their both noise and resolution properties. Amplification and blurring processes are due to a sequence of conversion stages within the screen which contribute to fluctuations in the number and spatial distribution of the optical quanta recorded by the optical detector (e.g. film, television camera, CCD, etc). The purpose of this paper is to investigate the stochastic noise arising from granularity as well as the variation of spatial resolution of granular fluorescent screens in terms of the detector's structure. Using a custom-validated Monte Carlo model, the parameters of interest were evaluated for the widely used Gd2O2S:Tb phosphor material. We have studied the variations of (i) the modulation transfer function, (ii) the Swank factor and (iii) the zero-frequency detective quantum efficiency (DQE), under several conditions employed in conventional and digital mammography and radiology. Several evaluations are provided for the imaging metrics as a function of the x-ray energy (18 keV, 49 keV and 51 keV), phosphor coating weight (20 mg cm−2, 34 mg cm−2 and 60 mg cm−2), grain size (from 4 µm up to 13 µm) and packing density (from 50% up to 85%). It was found that screens of high packing density can combine high zero-frequency DQE with improved resolution properties. For a digital mammographic imaging system (34 mg cm−2, 18 keV), a packing density of 85% can improve the spatial resolution of the screen by 1.6 cycles mm−1 in comparison to that of 50% packing density. Similarly, for radiographic cases (60 mg cm−2, 49 keV), the spatial resolution can be improved by 1.7 cycles mm−1. The aforementioned findings provide the resolution benefits of using high packing density screens.	en
heal.publisher	Cherry, S. R.	en
heal.journalName	Physics in Medicine and Biology	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true