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Title: Light emission efficiency and imaging performance of Gd2O2S:Eu powder scintillator under x-ray radiography conditions
Authors: Μιχαήλ, Χρήστος Μ.
Φούντος, Γεώργιος Π.
Λιαπαρίνος, Παναγιώτης Φ.
Καλύβας, Νεκτάριος Ι.
Βαλαής, Ιωάννης Γ.
Contributors: Κανδαράκης, Ιωάννης Σ.
Παναγιωτάκης, Γεώργιος Σ.
Item type: Journal article
Keywords: X-ray detectors;X-ray optics;Ανιχνευτές ακτίνων-Χ;Οπτικά ακτίνων Χ
Subjects: Medicine
Issue Date: 19-Jan-2015
Date of availability: 19-Jan-2015
Publisher: American Association of Physicists in Medicine
Abstract: Purpose: To evaluate Gd2O2S:Eu powder phosphor as a radiographic image receptor and to compare it to phosphors often used in radiography. Gd2O2S:Eu is nonhygroscopic, emitting red light with decay time close to that of Gd2O2S:Tb. Methods: The light intensity emitted per unit of x-ray exposure rate absolute luminescence efficiency was measured for laboratory prepared screens with coating thicknesses of 33.1, 46.4, 63.1, 78.3, and 139.8 mg/cm2 and tube voltages ranging from 50 to 140 kVp. Parameters related to image quality such as the modulation transfer function MTF and the detective quantum efficiency DQE were also experimentally examined. In addition, a previously validated Monte Carlo code was used to estimate intrinsic x-ray absorption and optical properties, as well as the MTF and the Swank factor I of the Gd2O2S:Eu scintillators. Results: Gd2O2S:Eu light intensity was found higher than that of single CsI:Tl crystal for tube voltages up to 100 kVp. The MTF and the DQE were found to be comparable with those of Gd2O2S:Tb and CsI:Tl screens. MTF estimated by the Monte Carlo code was found very close to the experimental MTF values. Gd2O2S:Eu showed peak emission in the wavelength range 620–630 nm. Its emission spectrum was excellently matched to various optical detectors photodiodes, photocathodes, CCDs, and CMOS employed in flat panel detectors. Conclusions: Gd2O2S:Eu is an efficient phosphor potentially well suited to radiography and especially to some digital detectors sensitive to red light.
Language: English
Citation: Michail, C., Fountos, G., Liaparinos, P., Kalyvas, N., Valais, I., et al. (July 2010). Light emission efficiency and imaging performance of Gd2O2S:Eu powder scintillator under x-ray radiography conditions. Medical Physics. 37(7). pp. 3694-3703. American Association of Physicists in Medicine. Available from:
Journal: Medical Physics
Type of Journal: With a review process (peer review)
Access scheme: Publicly accessible
License: Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες
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