X-ray Performance Evaluation of the Dexela CMOS APS X-ray Detector Using Monochromatic Synchrotron Radiation in the Mammographic Energy Range

摘要: Digital detectors based on complementary metal-oxide-semiconductors (CMOS) active pixel sensor (APS) technology have been introduced recently in many scientific applications. This work is focused the X-ray performance evaluation of a novel CMOS APS detector low energy medical imaging applications using monochromatic synchrotron radiation (i.e., 17-35 keV), which also allows studying how varies with energy. The was coupled to Thallium-activated structured cesium iodide (CsI:Tl) scintillator and detector's carried out terms sensitivity, presampling modulation transfer function (pMTF), normalized noise power spectrum (NNPS) resulting detective quantum efficiency (DQE). A Monte Carlo simulation used validate experimentally measured frequency DQE. Finally, effect iodine's secondary generated K-fluorescence X-rays pMTF DQE results evaluated. Good agreement (within 5%) observed between results. characterized for first time over wide range energies covering mammographic spectra. limited mainly by detectability scintillator. we show that current data could be calculate pMTF, NNPS any spectral shape within investigated energies.