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Examining surface shape appearance by touching and observing a lesion from different points of view is a part of the clinical process for skin lesion diagnosis. Motivated by this, we hypothesise that surface shape embodies important information that serves to represent lesion identity and status. A new sensor, Dense Stereo Imaging System (DSIS) allows us to capture 1:1 aligned 3D surface data and 2D colour images simultaneously. This thesis investigates whether the extra surface shape appearance information, represented by features derived from the captured 3D data benefits skin lesion analysis, particularly on the tasks of segmentation and classification. In order to validate the contribution of 3D data to lesion identification, we compare the segmentations resulting from various combinations of images cues (e.g., colour, depth and texture) embedded in a region-based level set segmentation method. The experiments indicate that depth is complementary to colour. Adding the 3D information reduces the error rate from 7:8% to 6:6%. For the purpose of evaluating the segmentation results, we propose a novel ground truth estimation approach that incorporates a prior pattern analysis of a set of manual segmentations. The experiments on both synthetic and real data show that this method performs favourably compared to the state of the art approach STAPLE [1] on ground truth estimation. Finally, we explore the usefulness of 3D information to non-melanoma lesion diagnosis by tests on both human and computer based classifications of five lesion types. The results provide evidence for the benefit of the additional 3D information, i.e., adding the 3D-based features gives a significantly improved classification rate of 80:7% compared to only using colour features (75:3%). The three main contributions of the thesis are improved methods for lesion segmentation, non-melanoma lesion classification and lesion boundary ground-truth estimation.

Deficits in phonology are among the most common and persistent impairments in aphasia after left hemisphere stroke, and can have significant functional consequences for spoken and written language. While many individuals make considerable gains through physiological restitution and in response to treatment, the neural substrates supporting phonological performance in the face of damage to critical language regions is poorly understood. To address this issue, we used BOLD fMRI to measure regional brain activation in a case series of individuals with aphasia after left MCA stroke during a phonological task. The results of this study support the idea that damage to even a portion of the phonological network results in impaired phonological processing. We found that individuals with left perisylvian damage tend to rely on the residual left-hemisphere language network, and typically recruit regions associated with domain-general cognitive processing which fall outside of the left-hemisphere language network. However, recruitment of these regions did not necessarily enhance phonological processing. Rather, more successful phonological processing outside the scanner was associated with recruitment of a language region in right posterior middle temporal gyrus and a region in left occipital pole. More successful phonological processing inside the scanner was associated with additional recruitment of the left supramarginal gyrus within the healthy control network, engagement of bilateral intraparietal sulcus from the multi-demand network, and up-regulation of the right-hemisphere network of regions homotopic to the left-hemisphere language network seen in the healthy control group. These findings emphasize the contributions of residual components of the left-hemisphere language network, engagement of a non-linguistic domain-general multi-demand network, and the participation of the non-dominant right-hemisphere language network in successful phonological processing in chronic aphasia after stroke.

The current understanding of the distribution and frequency of periapical pathoses include biopsies submitted by all specialists and general dentists. As a result, they do not accurately reflect the distribution seen by endodontists. This retrospective chart review aims to determine the prevalence of periapical pathoses and associated demographics from biopsies submitted by endodontists over 30 years. All biopsy reports submitted to the Virginia Commonwealth University Oral Pathology Diagnostic Service from January 1, 1983 to December 31, 2012 were reviewed. Only reports submitted by verified endodontists and those with a periapical location were included. The following data was recorded from each report: submission date, referring endodontist, sex, age, race, biopsy location, tooth number, and histologic diagnosis. Results were calculated using chi-square and logistic regression analysis (significance p<0.05). Meeting the inclusion criteria were 9,777 biopsy reports for an overall distribution of 24.11% radicular cysts, 73.54% periapical granulomas, 1.66% scars, and 0.70% other pathoses. Findings include a significant association between sex, location, and diagnosis. An association with race, age, or location (left/right) was not seen. Significantly more radicular cysts were seen in males and in the anterior maxilla. Conversely, significantly more periapical granulomas were seen in females and in the posterior quadrants. Significantly more other diagnoses were found in the anterior mandible and more scars in the anterior maxilla. Overall, approximately ¾ of biopsies submitted for evaluation by endodontists are diagnosed as periapical granulomas and ¼ as radicular cysts. Other pathoses and scars make up less than 3% of diagnoses. Funding was provided through the AAE Resident Research Grant.

M.Dent.(Community Dentistry), Faculty of Health Sciences, University of the Witwatersrand, 2009 / Title: Knowledge, Attitudes and Practices of caregivers about oral lesions in HIV positive patients in NGOs /CBOs in Region 8, Johannesburg, Gauteng. Background: The HIV pandemic continues to be a major public health problem in South Africa where 11% of people were infected with HIV in 2005(HSRC, 2005).The care and support of these patients as they eventually become ill will necessitate the increase in use of community-based/homebased/ hospice institutions. The City of Johannesburg (CoJ), one of the metropolitan municipalities (local government) in Gauteng Province-SA, has been planning the development and implementation of programmes related to the prevention, care and support for people infected and affected by HIV/AIDS. Care and support has been limited to 18 NGOs/ CBOs. Four of these institutions provide palliative care and are staffed by 64 caregivers. Studies done throughout the world indicate that oral lesions associated with HIV occur in over half of HIV/AIDS patients. These oral lesions seriously impair the oral-health-related-quality of life in affected individuals and necessitate the need to provide services to alleviate them and improve patient comfort. The caregivers in the NGOs/CBOs are therefore pivotal in offering care and support in the management of HIV including the management of oral lesions. In order for the caregivers in the NGOs/CBOs to be able to manage the disease in its entirety; they need optimal knowledge of the infection/illness including the oral manifestations associated with the ailment. Objectives: (1.) To determine the knowledge of the caregivers in the NGOs/CBOs providing palliative care in Region 8, CoJ, Gauteng regarding common oral manifestations associated with HIV. of the caregivers in the NGOs/CBOs . (2.) To assess the attitudes of the caregivers in the NGOs/CBOs providing palliative care in Region 8, CoJ, Gauteng on common oral manifestations associated with HIV. (3.) To determine the practices of the caregivers in the NGOs/CBOs in Region 8, CoJ, Gauteng, pertaining to the common oral manifestations associated with HIV. (4.) To determine the sociodemographic profile of the caregivers providing palliative care in the NGOs/CBOs in Region 8, CoJ, Gauteng. Methods: A descriptive cross-sectional study was conducted where all caregivers providing care and support in the four NGOs/CBOs were invited to participate in the study. Data was collected by a customised questionnaire to obtain information on demographics, knowledge, attitudes and practices on providing for HIV positive patients. Results: The results were grouped according to training in oral health care (TOHC) and no training (NTOHC). The mean age was 43.5 years for TOHC and 30.8 years NTOHC and was statistically significant (p<0.005). There were statistical significant differences in the gender proportions in within groups in the both groups, employment status, work experience as a caregiver and training in general home-based care (p<0.05). Most (72.2%) of those NTOHC had little experience (<1 year) of care giving compared to 41.1% (p=0.03) and 33.3% were providing care without training in homebased care (HBC) compared to 100% (p=0.00). The caregivers trained in oral health care had knowledge levels shown by higher knowledge levels on four of seven variables compared to those who were not trained in oral health care (p< 0.05, Table 3.3 p.21). The majority of caregivers NTOHC reported that caring for the mouth of HIV positive patients is an ‘unpleasant difficult task and poses an infection risk to the caregivers’ while these concerns were expressed by the minority of caregivers TOHC (p<0.05). Practices performed by caregivers NTOHC were appropriate for dry mouth, difficulty in swallowing but was inappropriate for bleeding gums and bad breath while those caregivers TOHC provided appropriate advice/practices for oral thrush, bad breath, bleeding gums, dry mouth with statistical difference. Conclusion: The caregivers TOHC had fairly better knowledge, attitudes and practices regarding oral lesions in HIV compared to those NTOHC. There was strong likelihood of knowledge variables and training in oral health care. Recommendations: Bearing in mind the limitations of KAP surveys and the cross sectional nature of the study, it is recommended that training in oral health care and refresher courses for those trained must be incorporated into the programme of all caregivers working in palliative institutions because it will provide specialised knowledge about oral health and oral lesions in HIV improve their knowledge, attitudes and practices and thus provide a better service to their patients.

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Resumo: Há dúvidas em relação à melhor localização da sutura no reparo da lesão do tendão flexor dos dedos da mão, uma vez que o ponto central colocado na região dorsal vascularizada, apesar de gerar maior resistência que o ponto na região palmar, poderia, entretanto, interferir no suprimento sangüíneo do tendão. O objetivo da presente investigação foi avaliar, por meio da biomecânica e histopatologia, o efeito da sutura central na região de tendão normal vascularizada e na região de tendão fibrocartilaginoso avascular, no processo de cicatrização do tendão flexor profundo dos dedos do pé do coelho. Foram estudados 83 coelhos submetidos à sutura central tipo Kessler na região de tendão normal (grupo TN) e na região de tendão fibrocartilaginoso (grupo FC), completada com sutura periférica circunferêncial contínua. Após a cirurgia, o membro operado foi imobilizado pelo período de três semanas. Os animais foram sacrificados no período imediato, duas, três e seis semanas de pós-operatório. Concluiu-se que a colocação da sutura central na região de tendão normal vascularizada ou fibrocartilaginosa avascular não apresenta diferenças em relação aos aspectos biomecânicos e histopatológicos na cicatrização do tendão flexor profundo dos dedos do pé do coelho. / Abstract: There are doubts concerning the best place for suture in repairing the lesion at flexor tendon of fingers. Although the core suture at vascular dorsal region generates more resistance than at palm region it may however interfere in tendon blood supply. The objective of the present research was to evaluate through biomechanics and histopathology the effect of core suture at vascular normal region of tendon as well as at avascular fibrocartilagenous tendon during healing of deep flexor tendon at rabbit toes. Eighty-tree animals were submitted to core Kessler suture at normal tendon region (NT group) as well as at fibrocartilagenous tendon region (FC group) completed with continuous circumferential periphery suture. After surgery the operated extremity was immobilized for a three weeks . The animals were sacrificed immediately and after two, three and six weeks of surgery. It was concluded that core suture at normal or fibrocartilagenous tendon region showed no differences concerning biomechanical and histopathological aspects in healing of deep flexor tendon of rabbit toes. / Orientador: Sérgio Swain Müller / Coorientador: Kunie Iabuki Rabello Coelho / Banca: Hamilton da Rosa Pereira / Banca: Heitor José Rizzardo Ulson / Banca: Rames Mattar Júnior / Banca: Nilton Mazzer / Doutor

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