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URI permanente desta comunidadehttps://repositorioacademico.universidadebrasil.edu.br/handle/123456789/35

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    Análise e otimização dos algoritmos para angiografia por tomografia por coerência óptica e desenvolvimento de Phantom por impressão 3D
    (Universidade Brasil, 2021) Rodrigues, Karina de Cássia; Almeida, Vilson Rosa de; Amaral, Marcello Magri
    Skin grafts are surgically applied to repair skin lesions such as burns and extensive necrosis. The success of this surgical procedure is associated with good blood supply in the grafted region. Thus, the assessment of angiogenesis during the tissue repair process is essential for its prognosis. The development of non-invasive evaluation techniques is extremely important for the success of this procedure. One of the promising techniques is Optical Coherence Tomography Angiography (OCT-A), a noninvasive technique that can be used to obtain images of the vascularization of biological tissues. The adoption of this technique as a clinical practice in dermatology involves reducing its cost, and the use of equipment with a low acquisition rate (low cost) is a possible path. Thus, this work aimed to implement and optimize algorithms for obtaining angiography images by optical coherence tomography (OCT-A) for applications in images acquired with low acquisition rate and cost equipment. To test those methods, it is requiring the use of phantom that simulate the behavior of the microvascular system. Thus, this work also aimed at the development of a phantom to simulate a microvascular system using 3D printing technology. Phantoms containing microchannels were designed and printed on polylactic acid (PLA) using a 3D printer by fused filament deposition. These PLA phantoms were imaged with the OCT system (OQLabScope - Lumedica, USA). Seven different OCT-A methods were implemented (HFM, STS, CM, SV, OSV, ISC and UHS-OMAG) and compared against their processing time, signal-to-noise ratio, contrast, and contrast-to-noise ratio. The OSV and CM methods showed better overall performance based on these parameters, but CM shown higher processing time. An optimization of the CM method was proposed in this work, reducing the processing time by 99.2%, a significant gain for the algorithm that presented better performances in contrast
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    Utilização de palmilhas sensoriais para avaliação, percepção e correção do exercício em corredores iniciantes
    (Universidade Brasil, 2021) Rocha, Gabriel Mauriz de Moura; Garcia, Lívia Assis; Almeida, Vilson Rosa de
    The number of road runners has increased considerably all over the world. Analyzing variables such as plantar pressure and posture provide important information that helps to understand several factors related to running performance and prevent musculoskeletal injuries. The objective of this work was to evaluate, understand and correct the plantar pressure of beginner runners, through the proposal and application of training using sensory insoles and biofeedback. The present work was of field research type, with a longitudinal study with 30 participants. The experimental protocol was divided into three phases: in the first, the initial assessment of anthropometric data was carried out, assessment of the biomechanical characteristics of the foot, followed by static postural assessment using the Kinovea software and, subsequently, the assessment of static plantar pressure using the platform Pedana Sensor Medica with FreeStep® software; in the second phase, the participants performed the training protocol, for 4 weeks, totaling 12 treadmill running interventions and the use of the ARION® sensory insole with visual biofeedback, for 15 minutes in the first two weeks and 30 minutes in the last two. In the third phase, the same reassessment as in the first phase was carried out. Statistical analysis was performed with the SPSS Software for Windows version 20.0, considering the value of p ≤ 0.05. It was possible to demonstrate that there was a statistically significant variation between the measurements of plantar pressure in the forefoot after running training for the variables surface and surface/load ratio. In the investigation of the forefoot/rearfoot ratio, there was a significant difference for the surface, load and surface/load ratio variables. There was a statistical difference in the postural assessment after the protocol with a reduction in the angles of the head and lower limbs in the anterior view, the head on the left side in the lateral view and the left ankle and right lower limb in the posterior view. Experimental results demonstrated that the use of the sensory insole with biofeedback helps to improve the distribution of plantar pressure and postural angles of the participants. Therefore, it is possible to infer that the use of this device in new training methodologies, with a visual interface of the runner's biomechanical performance, can help reduce injuries and optimize the practice of road running.