A5053426349- Digital Radiography and Breast Imaging
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Advanced X-ray and CT Imaging
- Nuclear Physics and Applications
- Radiation Dose and Imaging
- Luminescence Properties of Advanced Materials
- Atomic and Subatomic Physics Research
- Quantum Dots Synthesis And Properties
- Advanced Semiconductor Detectors and Materials
- Advanced Radiotherapy Techniques
- Bone health and osteoporosis research
- Chalcogenide Semiconductor Thin Films
- Radiation Shielding Materials Analysis
- Radiomics and Machine Learning in Medical Imaging
- Infrared Thermography in Medicine
- AI in cancer detection
- X-ray Spectroscopy and Fluorescence Analysis
- Photoacoustic and Ultrasonic Imaging
- Kidney Stones and Urolithiasis Treatments
- Terahertz technology and applications
- CCD and CMOS Imaging Sensors
- Bone Metabolism and Diseases
- Advanced Photocatalysis Techniques
- Dental Radiography and Imaging
University of West Attica
2018-2025
Technological Educational Institute of Athens
2009-2018
University of Ioannina
1995-2000
Medical imaging instrumentation is mostly based on the use of luminescent materials coupled to optical sensors. These are employed in form granular screens, structured crystals, single transparent ceramics, etc. Storage phosphors also incorporated particular X-ray systems. The physical properties these should match criteria required by detective systems morphological and functional biomedical imaging. analyzed theoretical frameworks emanating from linear cascaded theory as well signal...
Fundamental imaging performance in terms of Modulation Transfer Function (MTF), Noise Power Spectrum (NPS) and Detective Quantum Efficiency (DQE) was investigated for a high resolution CMOS based sensor. The device consists 33.91 mg/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> Gd <sub xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O S:Tb scintillator screen, placed direct contact with photodiode array. array, featuring...
Purpose To evaluate powder phosphor as a radiographic image receptor and to compare it phosphors often used in radiography. is nonhygroscopic, emitting red light with decay time close that of . Methods The intensity emitted per unit x‐ray exposure rate (absolute luminescence efficiency) was measured for laboratory prepared screens coating thicknesses 33.1, 46.4, 63.1, 78.3, tube voltages ranging from 50 140 kVp. Parameters related quality such the modulation transfer function (MTF) detective...
Background: In this study, the light output of a cadmium tungstate (CdWO4) single crystal was measured under various X-ray radiographic energies. Methods: A CdWO4 (10 × 10 mm3) exposed to X-rays in 50–130 kVp range. Measurements were evaluated against published data for crystals equal dimensions (CaF2:Eu and Lu3Al5O12:Ce). Since examined application medical imaging detectors, emitted optical spectrum classified with respect spectral compatibility numerous commercial sensors. Results: The...
Certain imaging performance metrics are examined for a state-of-the-art 20 μm pixel pitch CMOS sensor (RadEye HR), coupled to Gd2O2S:Tb scintillator screen. The signal transfer property (STP), the modulation function (MTF), normalized noise power spectrum (NNPS) and detective quantum efficiency (DQE) were estimated according IEC 62220-1-1:2015 standard. detector exhibits excellent linearity (coefficient of determination STP linear regression fit, R2 was 0.9978), while its DQE peaks at 33%...
Abstract Ionizing radiation energy characterization is used in various applications such as medical imaging, environmental measurements and for security purposes. In these the detector material type where initial absorption occurs should have high density to enhance secondary carriers yield so assure maximum signal throughput electronics. Gd 2 O S:Tb scintillator, also mentioned phosphor has a decay time of 600 µs that been extensively studied an X-ray imaging detector. The PenEasy software...
In this study, the luminescence efficiency of a crystal-form barium fluoride (BaF2) inorganic scintillator was assessed for medical imaging applications. For experiments, we used typical X-ray tube (50–140 kVp) estimating absolute (AE). Furthermore, examined spectral matching with series optical detectors. BaF2 showed higher AE than cerium (CeF3), comparable to that commercially available bismuth germanate (Bi4Ge3O12-BGO), but lower gadolinium orthosilicate (Gd2SiO5:Ce-GSO:Ce) scintillator....
The absolute luminescence efficiency (AE) of a calcium fluoride (CaF2:Eu) single crystal doped with europium was studied using X-ray energies met in general radiography. A CaF2:Eu dimensions 10 × mm3 irradiated by X-rays. emission light photon intensity the sample evaluated measuring AE within range from 50 to 130 kV. results this work were compared data obtained under similar conditions for commercially employed medical imaging modalities, Bi4Ge3O12 and Lu2SiO5:Ce crystals. compatibility...
Calcifications are products of mineralization whose presence is usually associated with pathological conditions. The minerals mostly seen in several diseases calcium oxalate (CaC2O4), carbonate (CaCO3) and hydroxyapatite (HAp). Up to date, there no vivo method that could discriminate between minerals. To this aim, a dual energy x-ray was developed the present study. An analytical model implemented for determination Calcium/Phosphorus mass ratio ([Formula: see text]). simulation carried out...
Dual energy methods can suppress the contrast between adipose and glandular tissues in breast therefore enhance visibility of calcifications. In this study, a dual method based on analytical modeling was developed for detection minimum microcalcification thickness. To aim, modified radiographic X-ray unit considered, order to overcome limited kVp range mammographic units used previous DE studies, combined with high resolution CMOS sensor (pixel size 22.5 μ m) improved resolution. Various...
We describe a new method for assessing the Ca/P ratio of bone in vivo using γ‐ray photon absorptiometry. The theoretical approach and estimation variance are presented. Two radiation sources, Gd‐153 (100 keV), I‐125 (27.5 germanium detector were used to determine this ratio. Measurements made on phantoms with different ratios; also, was measured lamb sheep tibias, rabbit human fingers. Since accuracy is affected by amount fat collagen measurement field, effect measurements also investigated....
The dominant powder scintillator in most medical imaging modalities for decades has been Gd2O2S:Tb due to the very good intrinsic properties and overall efficiency. Apart from Gd2O2S:Tb, there are alternative phosphor scintillators such as Lu2SiO5:Ce Gd2O2S:Eu that have suggested use various modalities. emits red light can be combined mainly with digital mammography detectors CCDs. blue sensitivity films, photocathodes some photodiodes. For purposes of present study, two scintillating...
The aim of the present study was to investigate imaging transfer characteristics and luminescence efficiency (XLE) Gd <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O S:Eu powder scintillator for use in X-ray mammography detectors. emits red part visible spectrum, having very good spectral compatibility with optical sensors employed digital systems. Three scintillating screens, coating thicknesses 33.1, 46.4 63.1 mg/cm <sup...
The aim of the present work is to study performance scintillators currently used in PET and animal systems, under conditions met radiation therapy PET/CT imaging. results this will be useful applications where both CT photons as well megavoltage cone beam (MV CBCT) could detected using a common detector unit. To crystal samples GSO, LSO, LYSO, LuYAP YAP scintillators, doped with cerium (Ce <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">+3</sup>...