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Linardatos D, Koukou V, Martini N, Konstantinidis A, Bakas A, Fountos G, Valais I, Michail C. On the Response of a Micro Non-Destructive Testing X-ray Detector. MATERIALS 2021; 14:ma14040888. [PMID: 33668484 PMCID: PMC7917680 DOI: 10.3390/ma14040888] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 02/09/2021] [Accepted: 02/10/2021] [Indexed: 11/16/2022]
Abstract
Certain imaging performance metrics are examined for a state-of-the-art 20 μm pixel pitch CMOS sensor (RadEye HR), coupled to a Gd2O2S:Tb scintillator screen. The signal transfer property (STP), the modulation transfer function (MTF), the normalized noise power spectrum (NNPS) and the detective quantum efficiency (DQE) were estimated according to the IEC 62220-1-1:2015 standard. The detector exhibits excellent linearity (coefficient of determination of the STP linear regression fit, R2 was 0.9978), while its DQE peaks at 33% and reaches 10% at a spatial frequency of 3 cycles/mm, for the measured with a Piranha RTI dosimeter (coefficient of variation CV = 0.03%) exposure value of 28.1 μGy DAK (detector Air Kerma). The resolution capabilities of the X-ray detector under investigation were compared to other commercial CMOS sensors, and were found in every case higher, except from the previous RadEye HR model (CMOS-Gd2O2S:Tb screen pair with 22.5 μm pixel pitch) version which had slightly better MTF. The present digital imager is designed for industrial inspection applications, nonetheless its applicability to medical imaging, as well as dual-energy is considered and certain approaches are discussed in this respect.
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Affiliation(s)
- Dionysios Linardatos
- Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, Ag. Spyridonos, 12210 Athens, Greece; (D.L.); (V.K.); (N.M.); (G.F.); (C.M.)
| | - Vaia Koukou
- Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, Ag. Spyridonos, 12210 Athens, Greece; (D.L.); (V.K.); (N.M.); (G.F.); (C.M.)
| | - Niki Martini
- Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, Ag. Spyridonos, 12210 Athens, Greece; (D.L.); (V.K.); (N.M.); (G.F.); (C.M.)
| | - Anastasios Konstantinidis
- Radiological Sciences Group, Department of Medical Physics, Queen Alexandra Hospital, Portsmouth Hospitals University NHS Trust, Portsmouth PO6 3LY, UK;
| | - Athanasios Bakas
- Department of Biomedical Sciences, University of West Attica, Ag. Spyridonos, 12210 Athens, Greece;
| | - George Fountos
- Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, Ag. Spyridonos, 12210 Athens, Greece; (D.L.); (V.K.); (N.M.); (G.F.); (C.M.)
| | - Ioannis Valais
- Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, Ag. Spyridonos, 12210 Athens, Greece; (D.L.); (V.K.); (N.M.); (G.F.); (C.M.)
- Correspondence: ; Tel.: +30-210-5385-371
| | - Christos Michail
- Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, Ag. Spyridonos, 12210 Athens, Greece; (D.L.); (V.K.); (N.M.); (G.F.); (C.M.)
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