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

• Published in: Physica medica Vol. 24; no. 2; pp. 122 - 125
• Main Authors: Valais, I, Michail, C, David, S, Nomicos, C.D, Panayiotakis, G.S, Kandarakis, I
• Format: Journal Article
• Language: English
• Published: Italy Elsevier Ltd 01.06.2008
• Subjects: Biophysical Phenomena; Biophysics; Bismuth; Crystallization; Female; Gamma Cameras; Germanium; Humans; Inorganic scintillators; Luminescence; Luminescence efficiency; Lutetium; Mammography - methods; Matching factor; Medical X-ray imaging; Positron-Emission Tomography - methods; Radiography - methods; Radiology; Radiopharmaceuticals; Silicates; Yttrium; Inorganic scintillators; Medical X-ray imaging; Matching factor; Luminescence efficiency
• ISSN: 1120-1797; 1724-191X
• DOI: 10.1016/j.ejmp.2008.01.007

Abstract The present study is a comparative investigation of the luminescence properties of (Lu,Y)2 SiO5 :Ce (LYSO:Ce), Lu2 SiO5 :Ce (LSO:Ce), Gd2 SiO5 :Ce (GSO:Ce) and (Bi4 Ge3 O12 ) BGO single crystal scintillators under medical X-ray excitation. All scintillating crystals have dimensions of 10 × 10 × 10 mm3 are non-hygroscopic exhibiting high radiation absorption efficiency in the energy range used in medical imaging applications. The comparative investigation was performed by determining the absolute luminescence efficiency (emitted light flux over incident X-ray exposure) in X-ray energies employed in general X-ray imaging (40–140 kV) and in mammographic X-ray imaging (22–49 kV). Additionally, light emission spectra of crystals at various X-ray energies were measured, in order to determine the spectral compatibility to optical photon detectors incorporated in medical imaging systems and the overall efficiency (effective efficiency) of a scintillator–optical detector combination. The light emission performance of LYSO:Ce and LSO:Ce scintillators studied was found very high for X-ray imaging.