Luminescence efficiency of (Gd/sub 2/SiO/sub 5/:Ce) scintillator under x-ray excitation

Valais, I.; Kandarakis, I.; Nikolopoulos, Dimitrios; Sianoudis, I.; Dimitropoulos, N.; Cavouras, D.; Nomicos, C.; Panayiotakis, George

doi:10.1109/nssmic.2004.1466256

Cited by 3 publications

(18 citation statements)

References 21 publications

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“…An additional major consideration in medical imaging detectors is the light emission spectrum and its compatibility to the spectral sensitivity of various optical photon detectors. Spectral compatibility may be estimated by the spectral matching factor (SMF) and the effective efficiency (EE) (EE Z AE Â SMF) [10].…”

Section: Methodsmentioning

confidence: 99%

“…The absolute luminescence efficiency was determined by performing X-ray exposure and light flux measurements, previously described by Valais et al [10]. Six optical photon detectors currently used in digital radiography, computed tomography and nuclear medicine and their spectral matching factor with the scintillator crystals' X-ray excited light spectrum were examined ( Table 1).…”

Section: Methodsmentioning

confidence: 99%

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A comparative study of the luminescence properties of LYSO:Ce, LSO:Ce, GSO:Ce and BGO single crystal scintillators for use in medical X-ray imaging

Valais¹,

Michail²,

Stoppa³

et al. 2008

Physica Medica

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

A comparative study of the luminescence properties of LYSO:Ce, LSO:Ce, GSO:Ce and BGO single crystal scintillators for use in medical X-ray imaging

Valais¹,

Michail²,

Stoppa³

et al. 2008

Physica Medica

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“…Type I measurements were performed by an Ocean Optics S2000 grating monochromator (Ocean Optics Inc) (Valais et al, 2005) after excitation with a Vilber Lourmat, VL-215M, 312 nm UV lamp. The light emitted by the excited QD samples was transferred to the spectrometer through an 1 m long fiber optic cable (Avantes, Inc. FCB-UV400e2, Colorado, USA).…”

Section: Uv Excitation Of the Quantum Dotsmentioning

confidence: 99%

“…The light emitted by the excited QD samples was transferred to the spectrometer through an 1 m long fiber optic cable (Avantes, Inc. FCB-UV400e2, Colorado, USA). Following a well tested methodology (Valais et al, 2005), the optical spectrum was collected with the UV lamp placed 2 cm away from the QD sample. Corrections for light signal degradation due to fiber optic light losses were taken into account.…”

Section: Uv Excitation Of the Quantum Dotsmentioning

confidence: 99%

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Radioluminescence properties of the CdSe/ZnS Quantum Dot nanocrystals with analysis of long-memory trends

Nikolopoulos

Valais

Michail

et al. 2016

Radiation Measurements

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h i g h l i g h t sLuminescence properties of CdSe/ZnS QDs under UV and X-ray irradiation. Detrended fluctuation analysis used to identify long-memory trends in the signal. QDs of high concentrations exhibited high absolute efficiency up to 80 kVp. CdSe/ZnS showed potential for detection of X-rays in the medical imaging energies. a b s t r a c tThis paper reports radioluminescence properties of the CdSe/ZnS quantum dots. Three quantum dot samples were prepared with concentrations 14.2 Â 10 À5 mg/mL, 21.3 Â 10 À5 mg/mL and 28.5 Â 10 À5 mg/ mL, respectively. The ultraviolet induced emission spectra of CdSe/ZnS dots exhibited a peak at 550 nm ranging between 450 nm and 650 nm. Discrepancies observed between 250 nm and 450 nm were attributed to the solvent and cuvette. The absolute efficiency calculated from random fractional-Gaussian luminescence segments varied. Long-memory fractional-Brownian segments were also found. The quantum dot solution with concentration of 21.3 Â 10 À5 mg/mL exhibited the maximum absolute efficiency value at 90 kVp. The CdSe/ZnS dots have demonstrated potential for detection of X-rays in the medical imaging energy range.

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A comparative investigation of Lu₂SiO₅:Ce and Gd₂O₂S:Eu powder scintillators for use in x-ray mammography detectors

Michail

Fountos

Stoppa

et al. 2009

Meas. Sci. Technol.

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The dominant powder scintillator in most medical imaging modalities for decades has been Gd2O2S:Tb due to the very good intrinsic properties and overall efficiency. Apart from Gd2O2S:Tb, there are alternative powder phosphor scintillators such as Lu2SiO5:Ce and Gd2O2S:Eu that have been suggested for use in various medical imaging modalities. Gd2O2S:Eu emits red light and can be combined mainly with digital mammography detectors such as CCDs. Lu2SiO5:Ce emits blue light and can be combined with blue sensitivity films, photocathodes and some photodiodes. For the purposes of the present study, two scintillating screens, one from Lu2SiO5:Ce and the other from Gd2O2S:Eu powders, were prepared using the method of sedimentation. The screen coating thicknesses were 25.0 and 33.1 mg cm−2 respectively. The screens were investigated by evaluating the following parameters: the output signal, the modulation transfer function, the noise equivalent passband, the informational efficiency, the quantum detection efficiency and the zero-frequency detective quantum efficiency. Furthermore, the spectral compatibility of those materials with various optical detectors was determined. Results were compared to published data for the commercially employed ‘Kodak Min-R film-screen system’, based on a 31.7 mg cm−2 thick Gd2O2S:Tb phosphor. For Gd2O2S:Eu, MTF data were found comparable to those of Gd2O2S:Tb, while the MTF of Lu2SiO5:Ce was even higher resulting in better spatial resolution and image sharpness properties. On the other hand, Gd2O2S:Eu was found to exhibit higher output signal and zero-frequency detective quantum efficiency than Lu2SiO5:Ce.

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Luminescence efficiency of (Gd/sub 2/SiO/sub 5/:Ce) scintillator under x-ray excitation

Cited by 3 publications

References 21 publications

A comparative study of the luminescence properties of LYSO:Ce, LSO:Ce, GSO:Ce and BGO single crystal scintillators for use in medical X-ray imaging

A comparative study of the luminescence properties of LYSO:Ce, LSO:Ce, GSO:Ce and BGO single crystal scintillators for use in medical X-ray imaging

Radioluminescence properties of the CdSe/ZnS Quantum Dot nanocrystals with analysis of long-memory trends

A comparative investigation of Lu₂SiO₅:Ce and Gd₂O₂S:Eu powder scintillators for use in x-ray mammography detectors

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Luminescence efficiency of (Gd/sub 2/SiO/sub 5/:Ce) scintillator under x-ray excitation

Cited by 3 publications

References 21 publications

A comparative study of the luminescence properties of LYSO:Ce, LSO:Ce, GSO:Ce and BGO single crystal scintillators for use in medical X-ray imaging

A comparative study of the luminescence properties of LYSO:Ce, LSO:Ce, GSO:Ce and BGO single crystal scintillators for use in medical X-ray imaging

Radioluminescence properties of the CdSe/ZnS Quantum Dot nanocrystals with analysis of long-memory trends

A comparative investigation of Lu2SiO5:Ce and Gd2O2S:Eu powder scintillators for use in x-ray mammography detectors

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A comparative investigation of Lu₂SiO₅:Ce and Gd₂O₂S:Eu powder scintillators for use in x-ray mammography detectors