Speaker
Mr
Stratos David
(Department of Medical Physics, University of Patras, Patra, Greece)
Description
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 and the quantum detective efficiency 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 showed that Lu2SiO5:Ce powder scintillator performed adequately well in the
mammographic energy range.
Authors
Mr
Christos Michail
(Department of Medical Instrumentation, Technological Educational Institution of Athens, 12210 Egaleo, Greece)
Mr
Stratos David
(Department of Medical Physics, University of Patras, Patra, Greece)
Co-authors
Mr
Andrianos Toutountzis
(Department of Medical Instrumentation, Technological Educational Institution of Athens, 12210 Egaleo, Greece)
Prof.
Costas Nomicos
(Department of Electronics, Technological Educational Institution of Athens, Ag. Spyridonos, Aigaleo, 122 10 Athens, Greece)
Dr
Dimitris Nikolopoulos
(Department of Medical Instrumentation, Technological Educational Institution of Athens, 12210 Egaleo, Greece)
Dr
Dionysis Cavouras
(Department of Medical Instrumentation, Technological Educational Institution of Athens, 12210 Egaleo, Greece)
Dr
George Loudos
(Department of Electrical and Computer Engineering, National Technical University of Greece)
Prof.
George Panayiotakis
(Department of Medical Physics, School of Medicine, university of Patras,Patra,Greece)
Dr
Ioannis Kalatzis
(Department of Medical Instrumentation, Technological Educational Institution of Athens, 12210 Egaleo, Greece)
Prof.
Ioannis Kandarakis
(Department of Medical Instrumentation, Technological Educational Institution of Athens, 12210 Egaleo, Greece)
Dr
Ioannis Sianoudis
(Department of Physics, Chemistry and Materials Technology, Technological Educational Institution, 12210 Egaleo, Greece)
Mr
Ioannis Valais
(Department of Medical Instrumentation, Technological Educational Institution of Athens, 12210 Egaleo, Greece)
Dr
Nektarios Kalivas
(Greek Atomic Energy Commission, 153 10, Ag. Paraskevi P.O BOX 60092, Greece)
Mr
Nikolaos Dimitropoylos
(Department of Medical Imaging, Euromedica” medical center, 2 Mesogeion Ave., Athens, Greece)
Mr
Nikolaos Efthimiou
(Department of Medical Instrumentation, Technological Educational Institution of Athens, 12210 Egaleo, Greece)
Mr
Panagiotis Liaparinos
(Department of Medical Physics, University of Patras, Patra, Greece)
