PERFORMANCE CHARACTERIZATION OF AMORPHOUS SILICON DIGITAL DETECTOR ARRAYS FOR GAMMA RADIOGRAPHY Rajashekar Venkatachalam 1, Manoharan V1, Raghu C , Venumadhav Vedula1, Debasish Mishra2 1 GE- lob aR esea rch C nt , B g I dia 2 GE- lob aR e sea rch C nt , Ni ky u U.S.A Abstract This paper reports the performance characteristics of a-Si detectors with Ir-192 gamma source. 11, No. Both use TFTs. But material improvements and smaller pixels may see it move into the lead for the next generation of uncooled thermal imaging. 35, No. 18, No. 6Part1, 30 November 2016 | Medical Physics, Vol. amorphous silicon flat-panel-detector radiography prior to the spatial frequency filtering to the storage-phosphor radiography, the visibility of the hilum, heart border and ribs on the flat-panel-detector radiography was sig-nificantly superior and the visibility of the thoracic spine was inferior to that on the storage-phosphor radiogra- 41, No. The contrast and scatter content of images acquired with the FPD were equivalent to those acquired with the storage phosphor system. 77, No. Flat Panel History 1985 to 90 – Theoretical studies and early research-Xerox PARC, Varian, GE, Thomson, Philips, U. Mich. etc. 64, No. 41, No. 3, 14 June 2006 | Journal of Digital Imaging, Vol. 23, Bulletin of the Lebedev Physics Institute, Vol. These so-called “dangling” bonds impact the inherent properties of … 2, 24 June 2015 | Journal of Micromechanics and Microengineering, Vol. 2, 21 June 2005 | Medical Physics, Vol. During operation, the X – ray photon-excited scintillator has produced fluorescence, and the spectral range of the fluorescence is around 550 nm, which is the sensitivity peak of amorphous silicon. 5, 30 November 2016 | Medical Physics, Vol. And as of October 2017, we had an installation base of 170,000 flat panel detectors. 30, No. 3, Journal of Vascular Surgery, Vol. MATERIALS AND METHODS: The study was approved by the institutional ethics committee. X-ray images can be measured by scanning of a single linear sensor with a Gd 2 O 2 S phosphor sheet set on a sliding stage. Flat-panel (FP) based digital radiography systems have recently been introduced as a new and improved digital radiography technology; it is important to evaluate and compare this new technology with currently widely used conventional screen/film (SF) and computed radiography (CR) techniques. The measurement of DQE yielded a high value of 70% at zero spatial frequency. 10, 14 March 2016 | Wireless Personal Communications, Vol. Amorphous silicon, amorphous selenium, and complementary metal oxide semiconductor are the different types of flat panel detectors used for x-ray imaging. 31, No. 12, Radiation Protection Dosimetry, Vol. 40, No. RESULTS: Images obtained with the FPD demonstrated excellent uniformity, repeatability, and linearity, as well as MTF and DQE that were superior to those with the storage phosphor CR system. MATERIAL AND METHODS: The study enrolled 44 patients with known or presumed skeletal changes of the hand associated with inflammatory rheumatic diseases. Flat-Panel Silicon X-Ray Detector Versus Computed Radiography, Digital Radiography of the Chest: Detector Techniques and Performance Parameters, Digital Chest Radiography: Quality Assurance, Digital Chest Radiography: Practical Issues, On site evaluation of three flat panel detectors for digital radiography, Image quality in two phosphor-based flat panel digital radiographic detectors, Detection of Subtle Undisplaced Rib Fractures in a Porcine Model: Radiation Dose Requirement—Digital Flat-Panel versus Screen-Film and Storage-Phosphor Systems1, An experimental comparison of detector performance for direct and indirect digital radiography systems, Evaluation of a flat panel digital radiographic system for low-dose portable imaging of neonates, Quantitative evaluation of noise reduction strategies in dual-energy imaging, Chest Radiography: Optimization of X-ray Spectrum for Cesium Iodide–Amorphous Silicon Flat-Panel Detector1, Radiation Dose Reduction in Chest Radiography using a Flat-Panel Amorphous Silicon Detector, Detection of Simulated Chest Lesions by Using Soft-Copy Reading: Comparison of an Amorphous Silicon Flat-Panel–Detector System and a Storage-Phosphor System1, Characterization of a CCD-based digital x-ray imaging system for small-animal studies: properties of spatial resolution. 74, No. METHODS. 6, 30 November 2016 | Medical Physics, Vol. 62, No. 10, Physics in Medicine & Biology, Vol. 1, The British Journal of Radiology, Vol. 2, The British Journal of Radiology, Vol. 64, No. 65, No. 13, © 2021 Radiological Society of North America, To read the full-text, please use one of the options below to sign in or purchase access, Purchase this article as pay-per-view (unlimited access for 24 hours), https://doi.org/10.1148/radiology.218.3.r01fe45683, Development of a 55 μ Chest radiographs can be acquired with a significantly lower patient radiation dose using an amorphous silicon flat-panel system than using an amorphous selenium flat-panel system, thereby producing images that are equal or even superior in quality to those of the amorphous selenium flat-panel detector system. Investigative Radiology. Varex Imaging’s amorphous silicon-based detectors are the benchmark for radiography in industrial, medical and dental applications. 31, No. The advantages of digital radiography systems, based on a flat-panel detector as an instant image display, facilitation of work flow in the radiology department, and digital networking and archiving, are well in sight. Flat-panel detectors: how much better are they? 34, No. The flat-panel detector furthermore has an MTF that is superior to that in regular screen-film systems and also provides a substantially larger dynamic range. MARTIN SPAHN;MICHAEL STROTZER;MARKUS VÖLK;STEFAN BÖHM;BERNHARD GEIGER;GERHARD HAHM;STEFAN FEUERBACH; From *Siemens AG, Medical Engineering, Angio, Fluoro, and Rad Systems Development, Forchheim, Germany, and the †Department of Diagnostic Radiology, University Hospital Regensburg, Regensburg, Germany. 7Part1, 1 March 2005 | Radiology, Vol. 11, 19 October 2016 | Journal of Instrumentation, Vol. 65, No. 1, 1 May 2010 | Japanese Journal of Radiology, Vol. 1-3, Japanese Journal of Radiological Technology, Vol. 231, No. 81, No. MATERIALS AND METHODS: The 41 × 41-cm digital FPD is constructed on a single monolithic glass substrate with a structured cesium iodide scintillator layer and an amorphous silicon thin-film transistor array for image readout. 9, 24 May 2004 | Medical Physics, Vol. These detectors were originally designed for radiography and uoroscopy, but because of their compactness, exibility, low spatial distortion, and relative low-cost, 2, American Journal of Roentgenology, Vol. Amorphous silicon is form of silicon, the second most abundantly occurring natural element on Earth. S2, 17 May 2006 | Medical Physics, Vol. m 1, European Journal of Radiology, Vol. 5, 1 April 2004 | Radiology, Vol. Comparison of Different Radiography Systems in an Experimental Study for Detection of Forearm Fractures and Evaluation of the M? 234, No. 1040, 30 November 2016 | Medical Physics, Vol. Use amorphous selenium (electron emitting material) and are sometimes referred to as direct radiography systems (DR). 3, 25 June 2003 | Medical Physics, Vol. 11, 24 November 2016 | Journal of Instrumentation, Vol. The scintillator consisted of a layer of structured cesium iodide. 8, 1 January 2009 | Radiology, Vol. 229, No. 7, Journal of the Korean Magnetics Society, Vol. 15, No. If the address matches an existing account you will receive an email with instructions to reset your password. Intraprocedural imaging: Flat panel detectors, rotational angiography, FluoroCT, IVUS, or still the portable C-arm? The scintillator consisted of a layer of structured cesium iodide. 2, European Journal of Radiology, Vol. pitch 8 inch CMOS image sensor for the high resolution NDT application, A novel radiation detector for removing scattered radiation in chest radiography: Monte Carlo simulation-based performance evaluation, Image Selection Algorithm Proposal for Digital Radiography Training Simulator, Chest X-ray Artifact Caused by Bilateral 99mTc-Antimony Trisulfite Injection for Sentinel Node Imaging in a Patient With Breast Cancer, Gain Correction for an X-ray Imaging System With a Movable Flat Panel Detector and Intrinsic Localization Crosshair, Vascular Imaging for Image-Guided Interventions, Sub-micron gap in-plane micromechanical resonators based on low-temperature amorphous silicon thin-films on glass substrates, Property of Focal Spot of Electron Beam Depending on the Anode Angle of X-ray Tube Using a Finite Element Method, Detectability of simulated interstitial pneumonia on chest radiographs: comparison between irradiation side sampling indirect flat-panel detector and computed radiography, Characterization of a clinical unit for digital radiography based on irradiation side sampling technology, Effective DQE (eDQE) for monoscopic and stereoscopic chest radiography imaging systems with the incorporation of anatomical noise, Estimation of the two-dimensional presampled modulation transfer function of digital radiography devices using one-dimensional test objects, Evaluation and comparison of image quality for indirect flat panel systems with CsI and GOS scintillators, Dynamic dual-energy chest radiography: a potential tool for lung tissue motion monitoring and kinetic study. (e-mail. 45, No. The amorphous silicon flat-panel detector radiography system allowed an important and significant reduction in both entrance skin dose and effective dose compared with the film-screen radiography (× 2.7 decrease) or computed radiography (× 1.7 decrease) system. A flat-panel detector based on a matrix of amorphous silicon was integrated into a projection radiography system. 25, No. The design and the performance of a 20 cm by 20 cm flat panel x-ray detector for digital radiography and fluoroscopy is described: Thin film amorphous silicon (aSi) technology has … 237, No. 19, No. 117, No. No thin-film-transistor (TFT) technology C. A scintillator material to produce light in a two-step process D. Amorphous silicon bonded to amorphous selenium as a two-step process For the first time, a team at HZB has identified the atomic substructure of amorphous silicon with a resolution of 0.8 nanometres using X-ray and neutron scattering at BESSY II … 4, Technology in Cancer Research & Treatment, Vol. 227, No. 56, No. 28, No. One such device, a large-area, flat-panel, amorphous silicon imaging array, has been developed and is currently being tested. 33, No. 9, 21 September 2012 | Medical Physics, Vol. Address correspondence to H.G.C. Subscribe now (individual subscription: $373.00), (This functionality works only for purchases made as a guest), Physics in Medicine & Biology, Vol. 114, No. Like a TFT-LCD display, millions of roughly 0.2 mm pixels each containing a thin-film transistor form a grid patterned in amorphous silicon on the glass substrate. Results with the FPD system were compared to those with a storage phosphor computed radiography (CR) system. 35(4):260-266, APRIL 2000. 40, No. Enter your email address below and we will send you your username, If the address matches an existing account you will receive an email with instructions to retrieve your username. The active matrix size of 30002 pixels together with a pixel size of 143 μm provided a large image area of 43 × 43 cm2. 1, 1 May 2002 | Applied Optics, Vol. 4, 17 January 2003 | Medical Physics, Vol. It is mainly composed of a scintillator, a photodiode circuit made of amorphous silicon, and an underlying TFT charge signal readout circuit. 1From the Department of Radiology, Digital Imaging Research Division, Duke University Medical Center, Box 3302, Room 139, Bryan Research Building, Durham, NC 27710 (all authors); and the Department of Biomedical Engineering, Duke University, Durham, NC (C.E.F., R.J.W., J.T.D., A.H.B.). Amorphous silicon appears to be an attractive material for making two dimensional, position sensitive x-ray and particle detectors. 970, 20 May 2008 | Medical Physics, Vol. 23, No. the material which 'catches the X-rays', and converts them to either charge or lower energy photons. 1, 26 March 2003 | Medical Physics, Vol. Amorphous silicon (a-Si) has been under intense investigation for over a decade for use in low cost photovoltaic solar cells and more recently for use in electronic devices, displays, and imaging optical sensors. 226, No. 61, No. PURPOSE: To compare image quality and estimated dose for chest radiographs obtained by using a cesium iodide–amorphous silicon flat-panel detector at fixed tube voltage and detector entrance dose with and without additional 0.3-mm copper filtration. … al flat-panel detector and the direct amorphous selenium B known or skeletal! 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