Author/Authors :
David، نويسنده , , S. and Michail، نويسنده , , C. and Valais، نويسنده , , I. and Nikolopoulos، نويسنده , , D. and Liaparinos، نويسنده , , Tracy P. and Kalivas، نويسنده , , N. and Kalatzis، نويسنده , , I. and Toutountzis، نويسنده , , A. and Efthimiou، نويسنده , , N. and Loudos، نويسنده , , G. and Sianoudis، نويسنده , , I. and Cavouras، نويسنده , , D. and Dimitropoulos، نويسنده , , N. and Nomicos، نويسنده , , C.D. and Kandarakis، نويسنده , , I. and Panayiotakis، نويسنده , , G.S.، نويسنده ,
Abstract :
The aim of the present study was to examine the light emission efficiency of Lu2SiO5:Ce (LSO) powder scintillator under X-ray mammographic imaging conditions. Powder LSO scintillator has never been used in X-ray imaging. For the purposes of the present study, a 25 mg/cm2 thick scintillating screen was prepared in our laboratory, by sedimentation of Lu2SiO5:Ce powder. Absolute luminescence efficiency measurements were performed within the range of X-ray tube voltages (22–49 kVp) used in mammographic applications. Parameters related to X-ray detection, i.e. the energy absorption efficiency (EAE) and the quantum detection efficiency (QDE) were calculated. A theoretical model, describing radiation and light transfer, was employed to fit experimental data and to estimate values of the intrinsic conversion efficiency and the light attenuation coefficients of the screen. The spectral compatibility of the LSO powder scintillator to mammographic X-ray films and to various electronic optical detectors was determined by performing light emission spectrum measurements and by taking into account the spectral sensitivity of the optical detectors. Results in the voltage range used in mammography showed that Lu2SiO5:Ce powder scintillator has approximately 10% higher values of QDE and 4.5% higher values of EAE than Gd2O2S:Tb.
Keywords :
Radiation detectors , Luminescence efficiency , inorganic scintillators , LSO:Ce
