Evaluation of ZnS:Cu phosphor as X-ray to light converter under mammographic conditions

Kandarakis, I.; Cavouras, D.; Nikolopoulos, Dimitrios; Αναστασίου, Α.; Dimitropoulos, N.; Kalivas, N.; Ventouras, E.; Kalatzis, Ioannis; Nomicos, C.; Panayiotakis, George

doi:10.1016/j.radmeas.2004.02.023

Cited by 30 publications

(13 citation statements)

References 22 publications

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“…LSO was purchased from Phosphor Technology Ltd. (UK, code: ZBK58/N-S1) with mean grain size of approximately 8 mm. Sodium orthosilicate (Na 2 SiO 3 ) was used as binding material between the powder grains [7,8]. The phosphor was used in the form of a thin layer (test screen) with coating weight of 25 mg/cm 2 for approximating the thickness of screens employed in X-ray mammography.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of the imaging performance of LSO powder scintillator for use in X-ray mammography

Michail

Stoppa

Liaparinos

et al. 2007

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Methodsmentioning

confidence: 99%

Evaluation of the imaging performance of LSO powder scintillator for use in X-ray mammography

Michail

Stoppa

Liaparinos

et al. 2007

Nuclear Instruments and Methods in Physics Research Section A:

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“…The modulation transfer function (MTF), describes the variation of contrast with spatial frequency and hence expresses spatial resolution (Dobbins, 2000;Kandarakis et al, 2005;Marshall, 2006). The MTF was measured by means of a PTW Freiburg tungsten edge test device.…”

Section: Modulation Transfer Function (Mtf)mentioning

confidence: 99%

Experimental measurement of a high resolution CMOS detector coupled to CsI scintillators under X-ray radiation

Michail

Valais

Seferis

et al. 2015

Radiation Measurements

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“…The semi-transparency allows use of the field-markings without removing the lid and it is normally removed only when doing the read-out to reduce the risk of excitation by surrounding light (see fig. 6) The FPA comprises a long afterglow phosphor screen where ZnS:Cu is the main component [9] [19]. It is intended to work mainly in the reflective mode, facing the x-ray tube, positioned at a SDD (Source to Detector Distance) not exceeding 100 cm.…”

Section: The Devices -Their Function and Corresponding Optimization Smentioning

confidence: 99%

Optimizing two radioluminescence based quality assurance devices for diagnostic radiology utilizing a simple model

et al. 2014

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The extrinsic (absolute) efficiency of a phosphor is expressed as the ratio of light energy emitted per unit area at the phosphor surface to incident x-ray energy fluence. A model described in earlier work has shown that by knowing the intrinsic efficiency, the particle size, the thickness and the light extinction factor ξ, it is possible to deduce the extrinsic efficiency for an extended range of particle sizes and layer thicknesses for a given design. The model has been tested on Gd 2 O 2 S:Tb and ZnS:Cu fluorescent layers utilized in two quality assurance devices, respectively, aimed for the assessment of light field and radiation field congruence in diagnostic radiology. The first unit is an established device based on both fluorescence and phosphorescence containing an x-ray sensitive phosphor (ZnS:Cu) screen comprising a long afterglow. Uncertainty in field edge position is estimated to 0.8 mm (k=2). The second unit is under development and based on a linear CCD sensor which is sensitized to x-rays by applying a Gd 2 O 2 S:Tb scintillator. The field profiles and the corresponding edge location are then obtained and compared. Uncertainty in field edge location is estimated to 0.1 mm (k=2).The properties of the radioluminescent layers are essential for the functionality of the devices and have been optimized utilizing the previously developed and verified model. A theoretical description of the maximization of phosphorescence is also briefly discussed as well as an interesting finding encountered during the development processes: focal spot wandering. The oversimplistic physical assumptions made in the radioluminescence model have not been found to lead the optimizing process astray. The obtained functionality is believed to be adequate within their respective limitations for both devices.

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Evaluation of ZnS:Cu phosphor as X-ray to light converter under mammographic conditions

Cited by 30 publications

References 22 publications

Evaluation of the imaging performance of LSO powder scintillator for use in X-ray mammography

Evaluation of the imaging performance of LSO powder scintillator for use in X-ray mammography

Experimental measurement of a high resolution CMOS detector coupled to CsI scintillators under X-ray radiation

Optimizing two radioluminescence based quality assurance devices for diagnostic radiology utilizing a simple model

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