Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 318 for “"Radiography"”.
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Applications of neutron radiography & tomography
… a sample. The underlying physics of neutron radiography and tomography mean that it has fundamental similarities to x-ray techniques, although some subtle differences mean that neutrons are often applicable in circumstances where x-rays are not. This complementarity is presented and …
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Low fluence neutron radiography techniques
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1997.
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ADVANCED APPLICATIONS OF COSMIC-RAY MUON RADIOGRAPHY
… for advanced applications of cosmic-ray muon radiography discussed here, specifically: 1) imaging a nuclear reactor with near horizontal muons, and 2) identifying materials through the analysis of radiation lengths weighted by density and secondary signals that are induced by cosmic-ray muon …
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Beam characterization at the neutron radiography reactor
… at the Idaho National Laboratory Neutron Radiography Reactor (NRAD). The experiments which measured the beam's effective length-to-diameter ratio and image quality are based on American Society for Testing and Materials (ASTM) standards. An analysis of the image produced by a calibrated …
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A comparative study evaluating the performance of diagnostic radiography units and protocols for paediatric and adult chest radiography examinations
… radiation dose for paediatric and adult chest radiography (CXR), between and within hospitals. Large variations in IQ could influence the diagnostic accuracy, and variations in radiation dose could affect the risk to patients. This thesis aims to develop, validate and then use a novel method …
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Observer variation in detecting lymphadenopathy on chest radiography
… in the detection of lymphadcnopathy on chest radiography in children at risk for tuberculosis. Methods Dianostic test. Chest radiography using antero-posterior and lateral films. Observers. Four paediatric pulmonologists independently viewing the radiographs. Alain outcome measures. Inter- and …
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Detecting corrosion in aircraft components using neutron radiography
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1996.
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Neutron radiography with the VPI & SU research reactor
… study to determine the feasibility of neutron radiography with the VPI & SU Research Reactor has been completed. Various experimental facilities of the reactor were tested to determine which gave the best beam parameters. The beam parameters considered were: 1) thermal neutron flux; 2) thermal …
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Applicability of cosmic ray muon radiography to nuclear nonproliferation
… capable arming a nuclear device. Cosmic ray muon radiography offers a passive detection system capable of probing the atomic number, Z, of materials within shipping containers by measuring the deviation of muons as they traverse the volume being scanned. This thesis aims to provide a systematic …
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Multiple Monoenergetic Gamma Radiography (MMGR) using compact superconducting cyclotron
… methods and other major deployed systems. This radiography system was designed using an ION-12SC compact superconducting 12 MeV proton cyclotron. Using a specially designed hybrid graphite water target, monoenergetic photons were generated at 4.4, 6.1, 6.9, and 7.1 MeV from (p, p2) nuclear …
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Spectroscopic radiography with monoenergetic neutrons for homeland security applications
… in the 11B(d,n[gamma])12C reaction. Neutron radiography in current use systems employs a total count analysis to reconstruct hydrogenous content in scanned cargoes. This research presents a technique which leverages the large differences in the energy dependence of neutron interaction cross …
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An account of silence in diagnostic radiography : a cultural quilt
… present in general and accident and emergency radiography (X-ray); collectively referred to as projection imaging. Because silence is multi-faceted and often ambiguous, requisite methods of collages and follow-up conversations were used in the study providing the flexibility to explore a fluid …
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How the clinical settings of radiography programs affect learning perceptions
1 PDF file (xiv, 246 pages)
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Assessment and optimisation of digital radiography systems for clinical use
… ultrasound. Initially the transition to general radiography was slow and fragmented but in the last 10-15 years in particular, huge investment by the manufacturers, greater and cheaper computing power, inexpensive digital storage and high bandwidth data transfer networks have lead to an enormous …
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Digital subtraction radiography for monitoring carious lesions using clinical radiographs
… or regressing.<br/><br/>Digital subtraction radiography (DSR) has been available for several years and has a possible application in monitoring progression and regression of carious lesions over time. DSR is the process of computerised subtraction of grey values of geometrically corresponding …
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Radiation dose measurement and prediction for linear slit scanning radiography
… dose measurements made for linear slit scanning radiography (LSSR) and a dose prediction model that was developed for LSSR. The measurement and calculation methods used for determining entrance dose and effective dose (E) in conventional X-ray imaging systems were verified for use with LSSR. …
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Moderator design for accelerator based neutron radiography and tomography systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994.
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Fast neutron resonance radiography for element imaging : theory and applications
Fast Neutron Resonance Radiography (NRR) has been devised as an elemental imaging method, with immediate applications to detecting explosives and drugs in passenger suitcases. In the NRR method, the 2-D elemental mapping of hydrogen, carbon, nitrogen, oxygen and the sum of other elements are …
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