Analysis of the imaging performance in indirect digital mammography detectors by linear systems and signal detection models

dc.contributor.author	Λιαπαρινός, Παναγιώτης	el
dc.contributor.author	Καλύβας, Νεκτάριος	el
dc.contributor.author	Κανδαράκης, Ιωάννης	el
dc.contributor.author	Κάβουρας, Διονύσης	el
dc.date.accessioned	2015-06-07T21:06:35Z
dc.date.available	2015-06-07T21:06:35Z
dc.date.issued	2015-06-08
dc.identifier.uri	http://hdl.handle.net/11400/15560
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.sciencedirect.com	en
dc.subject	Digital mammography
dc.subject	X-ray converters
dc.subject	Ψηφιακή μαστογραφία
dc.subject	Μετατροπείς ακτινών Χ
dc.title	Analysis of the imaging performance in indirect digital mammography detectors by linear systems and signal detection models	en
heal.type	journalArticle
heal.classification	Medicine
heal.classification	Radiology, Medical
heal.classification	Ιατρική
heal.classification	Ραδιολογία, Ιατρική
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh00006614
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh85110777
heal.classificationURI	N/A-Ιατρική
heal.classificationURI	N/A-Ραδιολογία, Ιατρική
heal.identifier.secondary	DOI: 10.1016/j.nima.2012.08.014
heal.language	en
heal.access	campus
heal.publicationDate	2013
heal.bibliographicCitation	Liaparinos, P., Kalyvas, N., Kandarakis, I. and Cavouras, D. (2013) Analysis of the imaging performance in indirect digital mammography detectors by linear systems and signal detection models. "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment", 697, p.87-98	en
heal.abstract	The purpose of this study was to provide an analysis of imaging performance in digital mammography, using indirect detector instrumentation, by combining the Linear Cascaded Systems (LCS) theory and the Signal Detection Theory (SDT). Observer performance was assessed, by examining frequently employed detectors, consisting of phosphor-based X-ray converters (granular Gd 2O 2S:Tb and structural CsI:Tl), coupled with the recently introduced complementary metal-oxide-semiconductor (CMOS) sensor. By applying combinations of various irradiation conditions (filter-target and exposure levels at 28 kV) on imaging detectors, our study aimed to find the optimum system set-up for digital mammography. For this purpose, the signal to noise transfer properties of the medical imaging detectors were examined for breast carcinoma detectability. Methods: An analytical model was applied to calculate X-ray interactions within software breast phantoms and detective media. Modeling involved: (a) three X-ray spectra used in digital mammography: 28 kV Mo/Mo (Mo: 0.030 mm), 28 kV Rh/Rh (Rh: 0.025 mm) and 28 kV W/Rh (Rh: 0.060 mm) at different entrance surface air kerma (ESAK) of 3 mGy and 5 mGy, (b) a 5 cm thick Perspex software phantom incorporating a small Ca lesion of varying size (0.1-1 cm), and (c) two 200 μm thick phosphor-based X-ray converters (Gd2O2S:Tb, CsI:Tl), coupled to a CMOS based detector of 22.5 μm pixel size. Results: Best (lowest) contrast threshold (CT) values were obtained with the combination: (i) W/Rh target-filter, (ii) 5 mGy (ESAK), and (iii) CsI:Tl-CMOS detector. For lesion diameter 0.5 cm the CT was found improved, in comparison to other anode/filter combinations, approximately 42% than Rh/Rh and 55% than Mo/Mo, for small sized carcinoma (0.1 cm) and approximately 50% than Rh/Rh and 125% than Mo/Mo, for big sized carcinoma (1 cm), considering 5 mGy X-ray beam. By decreasing lesion diameter and thickness, a limiting CT (100%) was occurred for size values less than 0.2 cm. Conclusion: CT was found to be affected by the selection of target/filter and exposure combination. It was found that the optimum thickness of CsI:Tl was approximately 190 μm and for Gd 2O 2S:Tb 120 μm for the studied energy and ESAK range.	en
heal.journalName	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true