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|Title:||Evaluation of high packing density powder X-ray screens by Monte Carlo methods|
|Authors:||Λιαπαρίνος, Παναγιώτης Φ.|
Κανδαράκης, Ιωάννης Σ.
Κάβουρας, Διονύσης Α.
Καλύβας, Νεκτάριος Ι.
|Contributors:||Παναγιωτάκης, Γεώργιος Σ.|
|Item type:||Journal article|
|Keywords:||X-ray imaging;Phosphor screens;Απεικόνιση με ακτίνες Χ;Οθόνες φωσφόρου|
|Date of availability:||20-Jan-2015|
|Publisher:||Elsevier Science Ltd|
|Abstract:||Phosphor materials are employed in intensifying screens of both digital and conventional X-ray imaging detectors. High packing density powder screens have been developed (e.g. screens in ceramic form) exhibiting high-resolution and light emission properties, and thus contributing to improved image transfer characteristics and higher radiation to light conversion efficiency. For the present study, a custom Monte Carlo simulation program was used in order to examine the performance of ceramic powder screens, under various radiographic conditions. The model was developed using Mie scattering theory for the description of light interactions, based on the physical characteristics (e.g. complex refractive index, light wavelength) of the phosphor material. Monte Carlo simulations were carried out assuming: (a) X-ray photon energy ranging from 18 up to 49 keV, (b) Gd2O2S:Tb phosphor material with packing density of 70% and grain size of 7 μm and (c) phosphor thickness ranging between 30 and 70 mg/cm2. The variation of the Modulation Transfer Function (MTF) and the Luminescence Efficiency (LE) with respect to the X-ray energy and the phosphor thickness was evaluated. Both aforementioned imaging characteristics were shown to take high values at 49 keV X-ray energy and 70 mg/cm2 phosphor thickness. It was found that high packing density screens may be appropriate for use in medical radiographic systems.|
|Description:||Proceedings of the 10 th International Symposium on Radiation Physics-ISRP 10|
|Citation:||Liaparinos, P., Kandarakis, I., Cavouras, D., Kalivas, N., Delis, H., et al. (September 2007). Evaluation of high packing density powder X-ray screens by Monte Carlo methods. Nuclear Instruments and Methods in Physics Research A. 580(1). pp. 427–429. Elsevier Science Ltd. Available from: http://www.sciencedirect.com [Accessed 16/05/2007]|
|Journal:||Nuclear Instruments and Methods in Physics Research A|
|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|
|Appears in Collections:||Δημοσιεύσεις|
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