9,047 research outputs found

    Evaluating and Improving 4D-CT Image Segmentation for Lung Cancer Radiotherapy

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    Lung cancer is a high-incidence disease with low survival despite surgical advances and concurrent chemo-radiotherapy strategies. Image-guided radiotherapy provides for treatment measures, however, significant challenges exist for imaging, treatment planning, and delivery of radiation due to the influence of respiratory motion. 4D-CT imaging is capable of improving image quality of thoracic target volumes influenced by respiratory motion. 4D-CT-based treatment planning strategies requires highly accurate anatomical segmentation of tumour volumes for radiotherapy treatment plan optimization. Variable segmentation of tumour volumes significantly contributes to uncertainty in radiotherapy planning due to a lack of knowledge regarding the exact shape of the lesion and difficulty in quantifying variability. As image-segmentation is one of the earliest tasks in the radiotherapy process, inherent geometric uncertainties affect subsequent stages, potentially jeopardizing patient outcomes. Thus, this work assesses and suggests strategies for mitigation of segmentation-related geometric uncertainties in 4D-CT-based lung cancer radiotherapy at pre- and post-treatment planning stages

    A study of the community adjustments of twenty-two adolescents who were discharged from the Rhode Island Children's Center during July 1, 1946 -July 1, 1948

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    Thesis (M.S.)--Boston University, 1949. This item was digitized by the Internet Archive

    WHY DOESN'T HE MENTION SO-AND-SO?

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    An analysis of labor costs in the United States Merchant Marine

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    Thesis (M.B.A)--Boston UniversityThe purpose of this thesis is to analyze the maritime labor costs in connection with their effecta on the industry by three methods of approach: first, to explore the extent of the costs supported by the subsidization policy of the United States Government; second, to evaluate the justifications offered by seamen's unions in support of the wage levels attained by their effortsr and third, to appraise the claims of management in relation to the other two

    The Things We Do for Love: Stories

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    A collection of four short stories meditating on the themes of love, loss, and the things people do for their beloved

    SARA LEE FOODS TAKES FLIGHT: AN ECONOMIC IMPACT ANALYSIS OF A TURKEY PLANT CLOSURE

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    In 1998, the Sara Lee Corporation implemented a corporate strategy of deverticalization. Bil Mar Foods, Inc., a subsidiary of Sara Lee responsible for the processing of packaged meat products, followed the strategy by shutting down its turkey slaughter facility in Zeeland, Michigan. As a consequence, turkey growers in Michigan were left with no viable outlet for live bird slaughter and the potential end of live bird production in the region. This study analyzes the economic impact associated with the cessation of live bird slaughter at the Bil Mar Foods plant. The economic consequences may be as high as an 81millionlossintotalindustryoutput,a81 million loss in total industry output, a 29 million loss in income, and a total employment loss of nearly 800 jobs. Faced with these economic consequences, turkey growers in the region joined forces to form a valued-added cooperative.impact analysis, plant closure, turkey industry, Community/Rural/Urban Development, Livestock Production/Industries,
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