Effect of intrinsic-gain fluctuations on quantum noise of phosphor
materials used inmedical X-ray imaging

dc.contributor.author	Καλύβας, Νεκτάριος Ι.	el
dc.contributor.author	Κωσταρίδου, Ελένη	el
dc.contributor.author	Κανδαράκης, Ιωάννης Σ.	el
dc.contributor.author	Κάβουρας, Διονύσης Α.	el
dc.contributor.author	Νομικός, Κωνσταντίνος Δ.	el
dc.date.accessioned	2015-01-16T09:06:48Z
dc.date.available	2015-01-16T09:06:48Z
dc.date.issued	2015-01-16
dc.identifier.uri	http://hdl.handle.net/11400/4118
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://link.springer.com/	en
dc.subject	Radiography, Medical--Image quality
dc.subject	Ιατρική εικόνα
dc.subject	Οπτική κβάντα
dc.title	Effect of intrinsic-gain fluctuations on quantum noise of phosphor materials used inmedical X-ray imaging	en
heal.type	journalArticle
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.keywordURI	http://id.loc.gov/authorities/subjects/sh85110696
heal.contributorName	Παναγιωτάκης, Γεώργιος Σ.	el
heal.identifier.secondary	DOI: 10.1007/s003399900082
heal.language	en
heal.access	free
heal.recordProvider	Τ.Ε.Ι. Αθήνας. Σχολή Τεχνολογικών Εφαρμογών. Τμήμα Μηχανικών Βιοϊατρικής Τεχνολογίας Τ.Ε.	el
heal.publicationDate	1999
heal.bibliographicCitation	Kalivas, N., Costaridou, L., Kandarakis, I., Cavouras, D., Nomicos, C., et al. (September 1999). Effect of intrinsic-gain fluctuations on quantum noise of phosphor materials used in medical X-ray imaging.Applied Physics A. 69(3). pp. 337-341. Springer-Verlag. Available from: http://link.springer.com [Accessed 14/07/1999]	en
heal.abstract	The quality of a medical image depends, among other parameters, on quantum noise. Quantum noise is affected by the fluctuations in the number of optical quanta produced within the phosphor, per absorbed X-ray (i.e. phosphor intrinsic-gain fluctuations). This effect is considered by means of a factor, called in this study intrinsic-gain noise factor, IGNF(E). In existing theoretical models of quantum noise, the corresponding factor is taken to be equal to one. In this paper, an expression that accounts for the coefficient of variation of the phosphor intrinsic gain is introduced. This expression takes into account the process of electron–hole pair conversion to optical photons and the frequency distribution function of the emitted optical photon energy. Subsequently IGNF(E) is expressed in terms of this coefficient of variation. IGNF(E) has been calculated for several phosphors and for various energies. For all medical X-ray energies studied, phosphors that exhibit a high relative fluctuation of emitted optical photon energy, IGNF(E) exceeds by 2% to over 17% the corresponding factor of the existing theoretical models of quantum noise.	en
heal.publisher	Springer-Verlag	en
heal.journalName	Applied Physics A	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true