Light emission efficiency and imaging performance of  powder scintillator under x‐ray radiography conditions

Michail, C.; Fountos, G.; Liaparinos, P.; Kalyvas, N.; Valais, I.; Kandarakis, I.; Panayiotakis, George

doi:10.1118/1.3451113

Cited by 54 publications

(37 citation statements)

References 37 publications

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“…Comparing the Gd 2 O 2 S:Eu screen with the thinner LuPO 4 films (67 and 100 lm), the DQE of Gd 2 O 2 S:Eu is higher for the whole range of frequencies because of its better noise properties. One point that can explain the better noise properties of Gd 2 O 2 S:Eu screen is its higher luminescence efficiency under similar irradiation conditions as shown by Michail et al [15].…”

Section: Discussionmentioning

confidence: 67%

“…l tot;en ðEÞ is the total energy absorption coefficient of the scintillator, which includes all mechanisms of energy deposition locally at the point of X-ray interaction within the scintillators mass. All secondary photons, created just after the primary interaction effect, were assumed to escape the irradiated material [15]. l tot ðEÞ is the X-ray total attenuation coefficient.…”

Section: X-ray Detection Parametersmentioning

confidence: 99%

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On the response of semitransparent nanoparticulated films of LuPO4:Eu in poly-energetic X-ray imaging applications

et al. 2016

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In the present work, we demonstrate the fabrication technique of highly translucent layers of nanoparticulated (*50 nm) LuPO 4 :Eu phosphor, present their basic luminescent properties and give results of their performance in a planar imaging system coupled to a CMOS photodetector. For comparison, the imaging performance of an opaque Gd 2 O 2 S:Eu phosphor screen prepared by sedimentation is also shown. The X-ray detection parameters as well as the luminescence efficiency of the investigated films were discussed. Results show that the in-line transmittance at *600-700 nm, in the range of the phosphor luminescence, varies with respect to the thickness of the films from 40 to 50 % for a film of 67 lm thick to 4-12 % when the thickness increases to 460 lm. Yet, X-ray detection parameters get enhanced as the thickness of the films increases. Those results affect the luminescence efficiency curves of the films under poly-energetic X-ray radiation of various tube energies. The normalized noise power spectrum values were found similar for LuPO 4 :Eu films and a phosphor screen made using commercial Gd 2 O 2 S:Eu powder. The detective quantum efficiency of our films is clearly lower compared to the Gd 2 O 2 S:Eu screen from 2 to 10 cycles mm -1 frequency range while the modulation transfer function is lower from 0 to 5.5 cycles mm -1 frequency range. The acquired data allow to predict that high-temperature sintering of our films under pressure may help to improve their imaging quality, since such a processing should increase the luminescence efficiency without significant growth of the grains and thus without sacrificing their translucent character.

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Section: Discussionmentioning

confidence: 67%

Section: X-ray Detection Parametersmentioning

confidence: 99%

On the response of semitransparent nanoparticulated films of LuPO4:Eu in poly-energetic X-ray imaging applications

et al. 2016

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“…On the other hand, ceramic scintillators have gained attention in recent years due to their homogeneous doping and relatively simple method of preparation. Some effort has been made to produce transparent or translucent sintered ceramics [9,10], and ceramic powders (non-sintered polycrystalline materials) can be used in scintillation screens for high-resolution X-ray imaging [11]. For this reason, it is important to investigate the defects present in polycrystalline CdWO 4 in order to determine how the structural disorder of these micro-sized particles could affect its scintillation.…”

Section: Introductionmentioning

confidence: 99%

Thermally stimulated luminescence of polycrystalline CdWO4 at low temperatures

Novais¹,

Silva²,

Macedo³

2011

Journal of Luminescence

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“…The sensor pitch is 22.5 m  . The Quantum Detection Efficiency (QDE), Α(E), and the matching factor (α s ), Q(E), were calculated according to Michail et al [18].…”

Section: Methodsmentioning

confidence: 99%

Optimization of breast cancer detection in Dual Energy X-ray Mammography using a CMOS imaging detector

Koukou

Fountos

Martini

et al. 2015

J. Phys.: Conf. Ser.

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View the article online for updates and enhancements. Abstract. Dual energy mammography has the ability to improve the detection of microcalcifications leading to early diagnosis of breast cancer. In this simulation study, a prototype dual energy mammography system, using a CMOS based imaging detector with different X-ray spectra, was modeled. The device consists of a 33.91 mg/cm 2 Gd 2 O 2 S:Tb scintillator screen, placed in direct contact with the sensor, with a pixel size of 22.5 m  .Various filter materials and tube voltages of a Tungsten (W) anode for both the low and high energy were examined. The selection of the filters applied to W spectra was based on their Kedges (K-edge filtering). Hydroxyapatite (HAp) was used to simulate microcalcifications. Calcification signal-to-noise ratio (SNR tc ) was calculated for entrance surface dose within the acceptable levels of conventional mammography. Optimization was based on the maximization of SNR tc while minimizing the entrance dose. The best compromise between SNR tc value and dose was provided by a 35kVp X-ray spectrum with added beam filtration of 100μm Pd and a 70kVp Yb filtered spectrum of 800 m  for the low and high energy, respectively. Computer simulation results show that a SNR tc value of 3.6 can be achieved for a calcification size of 200 m  . Compared with previous studies, this method can improve detectability of microcalcifications.

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Light emission efficiency and imaging performance of powder scintillator under x‐ray radiography conditions

Abstract: Gd2O2S:Eu is an efficient phosphor potentially well suited to radiography and especially to some digital detectors sensitive to red light.

Cited by 54 publications

References 37 publications

On the response of semitransparent nanoparticulated films of LuPO4:Eu in poly-energetic X-ray imaging applications

On the response of semitransparent nanoparticulated films of LuPO4:Eu in poly-energetic X-ray imaging applications

Thermally stimulated luminescence of polycrystalline CdWO4 at low temperatures

Optimization of breast cancer detection in Dual Energy X-ray Mammography using a CMOS imaging detector

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