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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 10 of 44 (0.064 seconds)Spelling suggestions: "subject:"biomedical radiography"" "subject:"iomedical radiography""
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First pass radionuclide angiography and the evaluation of valvular regurgitationWiseman, Martin Nurock January 1998 (has links)
No description available.
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Studies of experimental cerebral ischaemia using magnetic resonance imaging and autoradiographyLythgoe, Mark Francis January 1999 (has links)
No description available.
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Assessment of fetal radiation dose to patients and staff in diagnostic radiologyOsei, Ernest Kwaku January 2000 (has links)
No description available.
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Studies of benefit and risk resulting from the UK Breast Screening ProgrammeBeckett, Jonathan January 2000 (has links)
No description available.
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The histamine system in human brain : changes in neurological and psychiatric disordersGoodchild, Rose Ellen January 1999 (has links)
No description available.
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The application of a semiconductor detector in the estimation of the effective dose in radiographic examination of the extremitiesEyden, Alison C. January 2001 (has links)
No description available.
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Long and short term effects of X-rays on charge coupled devicesTudge, Mark Vernon January 1996 (has links)
EEV buried channel charge coupled devices (BC CDs) with technological variations have been studied with respect to their response to 70kVp X-rays. Process variations considered are the conventional BCCD, scintillator coated BCCDs (Gadox(Eu) and Csl(Tl)) and the inversion mode device. The work was made necessary by the use of these CCDs for dental X-ray imaging. Effects investigated include changes in device operating voltages and dark current. The dark current buildup has been characterised in terms of a prompt component seen immediately following irradiation, and a time dependent component which occurs gradually. A major part of this work was the determination of the location and concentration of the energy states responsible for this dark current buildup. Also a novel aspect of the work was the derivation of an expression describing the time dependent component as a function of time and temperature. Effects associated with the bias dependence of the BCCD have also been considered, with particular regard to the effect of a negative substrate bias, and the theoretical explanation has been developed. The findings of this work have demonstrated the suitability of these devices for the commercial application of imaging X-rays for dentistry.
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Caracterização de uma câmara de ionização ar-livre em feixes diretos de raios X utilizados em mamografia / Characterization of a free-air ionization chamber in direct X-ray beams as used in mammographyLIMA, MATEUS H. de 21 January 2015 (has links)
Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2015-01-21T09:58:13Z
No. of bitstreams: 0 / Made available in DSpace on 2015-01-21T09:58:13Z (GMT). No. of bitstreams: 0 / Dissertação (Mestrado em Tecnologia Nuclear) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Caracterização de uma câmara de ionização ar-livre em feixes diretos de raios X utilizados em mamografia / Characterization of a free-air ionization chamber in direct X-ray beams as used in mammographyLIMA, MATEUS H. de 21 January 2015 (has links)
Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2015-01-21T09:58:13Z
No. of bitstreams: 0 / Made available in DSpace on 2015-01-21T09:58:13Z (GMT). No. of bitstreams: 0 / Neste trabalho foram realizados testes de estabilidade e de caracterização de uma câmara de ionização de ar-livre com cilindros concêntricos da marca Victoreen, modelo 481. Os testes foram feitos utilizando feixes diretos de mamografia como uma contribuição para a implantação desta câmara como sistema padrão primário para a grandeza kerma no ar. Os testes de caracterização realizados foram: curva de saturação, eficiência de coleção de íons, efeito de polaridade, linearidade da resposta com a taxa de kerma no ar e linearidade da resposta com a variação volumétrica. O teste de eficiência de coleção de íons possibilitou a determinação do fator de correção para recombinação iônica. A maioria dos testes realizados esteve em conformidade com os limites estabelecidos por normas internacionais. Foram obtidos os fatores de correção para atenuação de fótons no ar para as qualidades de mamografia com filtros de alumínio e molibdênio. Foram determinados também os fatores de correção para transmissão e espalhamento de fótons nas bordas do diafragma para as qualidades de mamografia com filtro de alumínio e para a qualidade padrão de mamografia com filtro de molibdênio. / Dissertação (Mestrado em Tecnologia Nuclear) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Fetal dosimetry from natural alpha emittersPurnell, Sasha Justine January 2000 (has links)
No description available.
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