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Showing 1 to 9 of 9 for “"metal artifacts"”.
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Characterization of metal artifacts in diffusion tensor imaging for spinal cord applications
… in DTI of the spinal cord is the presence of metal which causes geometric distortions, signal pile-up, and signal voids. Because most patients with spinal cord injury have some amount of metal hardware implanted for stabilization, it is important to confront issues involving metal as DTI of …
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Romarchite and Other Corrosion Phases on Metal Artifacts from the Queen Anne's Revenge (1718)
Metal artifacts from the pirate Blackbeard's flagship, Queen Anne's Revenge (1718), were studied and a preliminary assessment of the corrosion products that have formed on them is presented. Artifacts made of iron, lead, tin, copper, mercury, gold, and silver were recovered from the site with only …
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Development of A Ct Metal Artifact Management Algorithm For Proton Therapy Planning (Ampp) For Head and Neck Cancer Patients
… (high Z materials) are common sources of artifacts in Head and Neck (HN) images. Commercial artifact reduction techniques have been offered, but many are impractical, produce inaccurate CT images or are not clinically available, thus not widely implemented. The goal of this work is to use …
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Changing Continuities: The Removal Period (1795-1830) Archaeology of the Potawatomi and Kickapoo Peoples of Illinois
… manufacture; the recycling of Euro-American metal artifacts into tools and ornaments that expressed a Native identity; and the use of selected Euro-American material culture items compatible with such an identity. Change did happen, but it occurred within a Native context and served Native …
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Technological Adaptation on the Frontier: An Examination of Blacksmithing at Fort Michilimackinac, 1715-1781
… workshops at Fort Michilimackinac, as well as metal artifacts found across the site. A model for identifying blacksmithing activities within workshops was applied to archaeological data from Fort Michilimackinac and three blacksmith workshops were identified. These are described in terms of the …
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Multienergetic External-beam PIXE as a Means of Stydying the Surface Enrichment Effect in Coins
… PIXE to study the surface enrichment effect in metal artifacts. By varying the energy of the incident proton beam, we penetrated the artifact's surface to different levels and were able to produce a depth profile of the elemental composition of the sample. In this study, the sample set we chose …
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An investigation of the mechanical and physical properties of copper-silver alloys and the use of these alloys in Pre-Columbian America
… in the production of thin, silver-colored sheet metal artifacts. This thesis examines the mechanical and physical properties of the copper-silver alloy system that are important to understanding why copper-silver alloys became central to the metallurgies that developed among prehistoric societies …
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Copper Metallurgy in Cilicia and the Amuq in the Second Millennium BC: Insights into Aspects of Bronze Age Technology and Trade
… to examine both the possible sources of the metal and the techniques by which this material was manufactured into finished artifacts. The observed patterns of copper technology and trade are compared to the evidence from the wider Mediterranean and the Near East, so as to identify the …
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Reliability and Validity of Body Composition and Bone Mineral Density Measurements by DXA
Dual energy X-ray absorptiometry (DXA) has been well established in both clinical and research settings for measurement of bone mineral density (BMD), and is becoming more widely utilized for assessment of body composition. Reliability and validity are essential factors in both applications of this …