Bibliography: leaves 162-177. / xxiv, 177 leaves : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Overall aim is to access the use of bone resonance analysis (BRA) as an indication of fracture healing. / Thesis (Ph.D.)--University of Adelaide, Dept. of Orthopaedics and Trauma, 1997

Made available in DSpace on 2014-06-11T19:30:59Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-09-27Bitstream added on 2014-06-13T20:41:00Z : No. of bitstreams: 1 matai_cvb_dr_sjc.pdf: 864830 bytes, checksum: 252433555b8c9e4e86410c5c753a2004 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / As tomografias computadorizadas (TCs) tridimensionais (3D) solucionaram em grande parte as inconveniências da sobreposição de estruturas anatômicas comuns aos exames radiográficos convencionais (2D). O propósito neste trabalho foi avaliar por meio da Tomografia computadorizada de feixe cônico (TCFC) qual região oferece maior volume ósseo, se a região de mento ou a região de ramo da mandíbula. Foram selecionados 100 exames de TCFC, de indivíduos com idade de 18 a 89 anos do sexo masculino (50) e do feminino (50) com necessidade de realizar cirurgia para enxertia óssea autógena. Os exames foram avaliados por dois radiologistas treinados, para quantificar o volume ósseo das regiões potencialmente doadoras, que foram avaliadas por diferentes orientações para delimitação do volume potencial do leito doador, utilizando um software para avaliação. Sendo posteriormente avaliados pela análise estatística t de Student, teste de Tukey, correlacionando as diferenças estatísticamente significantes (p < 0,05) entre a avaliação das região mensuradas, por métodos diferentes. Verificou-se o maior potencial doador encontrado na região mentual, chegando a atingir o volume médio de 1,59cm3 contra 1,07cm3 a região de ramo. Concluímos que a região mentual, entre os dentes caninos inferiores, proporciona maior volume ósseo e assim como na revisão da literatura, encontramos maior volume ósseo para a região mentual quando comparada as outras regiões doadoras intraorais, avaliadas neste trabalho. E que a seleção do leito doador de enxerto ósseo autógeno intraoral deve ser principalmente julgada de acordo com o conhecimento anatômico da região eletiva e o domínio técnico/prático cirúrgico do Cirurgião / Computed tomography (CT) three-dimensional largely solved the inconvenience of overlapping anatomical accidents common to conventional radiographic. The purpose of this study was to evaluate by cone beam computed tomography (CBCT) the region that offers larger bone volume, the ramus or chin region. Were selected according to the criteria of inclusion and non inclusion, 100 CBCT scans of individuals aged 18-89 years old males (50) and female (50) with need for surgery for autogenous grafting, belonging to a particular clinical CT. The studies were evaluated by two trained radiologists in the program OsiriX ® 4.1.2V to quantify bone volume of potential donor regions, which were evaluated by different guidelines, defining the potential volume of the donor site. Further evaluated by statistical analysis Student's t and Tukey's test, that comproove statistically significant differences (p < 0,05) between the evaluations of the same region by different methods. With the largest potential donor found in the chin region, reaching an volume average of 1,59 cm3 against 1,07 cm3 the ramus region

A mathematical model which is used to detect bone edges accurately is described in this thesis. This model is derived by assuming the X-ray source to be a square region. It is shown that for an ideal X-ray source (point source), the bone edge lies exactly at the location of maximum first derivative of the imaged object's transmission function. However, for the non-ideal case, it is shown that the bone edge does not lie at the maximum first derivative location. Also, it is shown that an offset can be calculated from the edge parameters. The Marr- Hildreth edge detector is used to detect the initial estimates for edge location. Precise estimates are obtained by using the facet model. The offset is then calculated and applied to these estimates. / Master of Science

This investigation dealt with locating and measuring x-ray absorption of radiographic images. The methods developed provide a fast, accurate, minicomputer control, for analysis of embedded objects. A PDP/8 computer system was interfaced with a Joyce Loebl 3CS Microdensitometer and a Leeds & Northrup Recorder. Proposed algorithms for bone location and data smoothing work on a twelve-bit minicomputer. Designs of a software control program and operational procedure are presented. The filter made wedge and limb scans monotonic from minima to maxima. It was tested for various convoluted intervals. Ability to resmooth the same data in multiple passes was tested. An interval size of fifteen works well in one pass.

Orientador: Cíntia Lúcia Maniscalco / Banca: Júlio Carlos Canola / Banca: Jorge Luiz Oliveira Costa / Resumo: Com o presente estudo relata-se a freqüência, localização e tipo de alterações encontradas em 77 cães com suspeita de lesão óssea na mandíbula, em imagens radiográficas, do arquivo do Setor de Radiologia do Hospital Veterinário "Governador Laudo Natel" (HV), da Faculdade de Ciências Agrárias e Veterinárias, da Universidade Estadual Paulista (FCAV/UNESP), Câmpus de Jaboticabal, SP, no período de janeiro de 2001 a janeiro de 2006, correlacionando sexo, idade e raça dos animais. A pesquisa revelou 37 (48,05%) cães com lesões mandibulares. Dentre os cães acometidos 44,16% eram de raça indefinida e 14,29% da raça Poodle. Do total 33,77% eram machos e a idade mais afetada estava entre seis e nove anos (23,38%). A fratura (38,96%) foi à alteração mais encontrada e o local de maior ocorrência foi à região de premolares (24,38%) e molares (10,39%) do corpo da mandíbula. / Abstract: The present study reported the frequency, placement and kind of changes in 77 dogs supposed to have lesions at jawbone in radiographic images from the Radiological Sector archive, at the Veterinary Hospital Governador Laudo Natel (HV), of the Veterinary Faculty from São Paulo State University (FCAV/UNESP), Jaboticabal, SP, between January 2001 to January 2006, correlating sex, age and the breed of the animals. The study revealed 37 (48, 5%) of dogs with jawbone lesions. Among the dogs that were taken ill, 44,16% had no defined breed and 14,29% were Poodle. They were 33,7% male and the most affected age range was between six and nine (23,38%). The fracture (38,96%) was the most common change and it occurred most frequently in the premolar region (10,39%) and molar region (10,39%) of the mandible body. / Mestre

Although there are now many theories describing empirical relationships between strength properties of bone and various explanatory variables, the need for improved non-invasive diagnostic techniques to assess bone fragility is of core importance in clinical problems such as osteoporosis. The aim of this thesis was to develop non-invasive radiological methods to assess trabecular bone architecture. Measures of structural anisotropy and bone structure from X-ray or radiological projections have been developed. The first measure, the projected mean intercept length (PMIL), allows extraction of the total bone surface (BS/TV) and the mean intercept length (MIL) from projections of trabecular structure. The second measure, the line projection deviation (LPD), is a technique that quantifies the preferential alignment of trabecular bone from projections of the trabecular structure. Hence, in combination, the PMIL and LPD allow non-invasive extraction of BS/TV and more detailed preferential alignment from projections of the trabecular structure. In this thesis the PMIL and LPD are introduced and their properties explored. The PMIL and LPD are used to examine the anisotropy and architectural properties of a number of human vertebral body trabecular bone samples. When used in combination with clinical densitometry, these measures improve explanation of the variance in strength, elastic modulus and toughness of vertebral body trabecular bone samples by up to 40% when compared to densitometric values alone. While µCT can provide the information needed to access trabecular architecture, it cannot be used in clinical settings since its high radiation dose makes it only applicable to small objects ex-vivo. At present, clinically available CT does not provide sufficient resolution to resolve trabecular structures. Thus, the methods described in this thesis will allow estimates of structural parameters from plain X-rays, providing for the first time, the possibility of clinical use of such estimates. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1311218 / Thesis (Ph.D.) -- School of Medical Sciences, 2008

Made available in DSpace on 2014-06-11T19:23:43Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-12-20Bitstream added on 2014-06-13T20:11:28Z : No. of bitstreams: 1 neves_cc_me_jabo.pdf: 1932738 bytes, checksum: 2cc1bbf1472ac069094d5b9277cdf091 (MD5) / Universidade Estadual Paulista (UNESP) / Com o presente estudo relata-se a freqüência, localização e tipo de alterações encontradas em 77 cães com suspeita de lesão óssea na mandíbula, em imagens radiográficas, do arquivo do Setor de Radiologia do Hospital Veterinário Governador Laudo Natel (HV), da Faculdade de Ciências Agrárias e Veterinárias, da Universidade Estadual Paulista (FCAV/UNESP), Câmpus de Jaboticabal, SP, no período de janeiro de 2001 a janeiro de 2006, correlacionando sexo, idade e raça dos animais. A pesquisa revelou 37 (48,05%) cães com lesões mandibulares. Dentre os cães acometidos 44,16% eram de raça indefinida e 14,29% da raça Poodle. Do total 33,77% eram machos e a idade mais afetada estava entre seis e nove anos (23,38%). A fratura (38,96%) foi à alteração mais encontrada e o local de maior ocorrência foi à região de premolares (24,38%) e molares (10,39%) do corpo da mandíbula. / The present study reported the frequency, placement and kind of changes in 77 dogs supposed to have lesions at jawbone in radiographic images from the Radiological Sector archive, at the Veterinary Hospital Governador Laudo Natel (HV), of the Veterinary Faculty from São Paulo State University (FCAV/UNESP), Jaboticabal, SP, between January 2001 to January 2006, correlating sex, age and the breed of the animals. The study revealed 37 (48, 5%) of dogs with jawbone lesions. Among the dogs that were taken ill, 44,16% had no defined breed and 14,29% were Poodle. They were 33,7% male and the most affected age range was between six and nine (23,38%). The fracture (38,96%) was the most common change and it occurred most frequently in the premolar region (10,39%) and molar region (10,39%) of the mandible body.

Thesis (M.Tech.: Radiography) - Dept. of Radiography, Durban University of Technology, 2006 xxiv, 214 leaves, Annexures A-L / The aim of this research was to determine normal bone mineral density (BMD) reference ranges (means and standard deviations) for the lumbar spine, total hip and distal forearm, for Indian women of varying age groups in KwaZulu-Natal. The aim also included a comparison of the study population reference ranges with those provided by the manufacturer in order to evaluate any diagnostic implications.

A dissertation submitted in full compliance with the requirements for the M.Tech: Radiography,Durban University of Technology, 2006. / The aim of this research was to determine normal bone mineral density (BMD) reference ranges (means and standard deviations) for the lumbar spine, total hip and distal forearm, for Indian women of varying age groups in KwaZulu-Natal. The aim also included a comparison of the study population reference ranges with those provided by the manufacturer in order to evaluate any diagnostic implications. / M