Phantoms
Mostrando 37-48 de 72 artigos, teses e dissertações.
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37. AvaliaÃÃo da qualidade de imagem e do Ãndice volumÃtrico de Kerma Ar em tomografia computadorizada (CVOL) em Recife / Image quality and volume computed tomography Air Kerma index (CVOL) evaluation in Recife
The Computed Tomography (CT) is an important diagnostic imaging method, widely used. However, in spite of all the advantages and technologic advances within the CT scanners, the tomographic procedures result in high absorbed doses to patients. The main objective of this work was to perform a dosimetric study of CT scanners located at Recife and to evaluate t
Publicado em: 2008
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38. Etiología parasitaria y obstáculos epistemológicos: el caso de la malaria en Colombia
In this article we show the process that led Colombian medicine toward the discovery and acceptance of the causes of paludism, a disease that still haunts the large hot and humid zones in the country. To carry out this process, a new generation of physicians had to overrule the old miasma theory and accept the vectors theory. In this regard, however, Pasteur
História, Ciências, Saúde-Manguinhos. Publicado em: 2007-03
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39. Acoplamento dos fantomas tomogrÃficos FAX06 e MAX06 ao cÃdigo Monte Carlo GEANT4
The MAX06 and the FAX06 phantoms have been developed in recent years at the Department of Nuclear Energy of the Universidade Federal de Pernambuco. They are the first two adult tomographic or voxel phantoms which have body heights, body weights as well as organ and tissues masses based on the anatomical reference data given by the International Commission on
Publicado em: 2007
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40. Otimização do algoritmo de block matching aplicado a estudos elastográficos / Otimization of the block matching algorithm aplied to elastogtraphic studies.
Este trabalho apresenta uma análise sobre um novo método de formação de imagem, utilizando aparelhos de ultra-som a elastografia. Esta técnica baseia-se no fato de que quando um meio elástico, como o tecido, é deformado por uma tensão constante e uniaxial, todos os pontos no meio possuem um nível de deformação longitudinal cujo componente principa
Publicado em: 2007
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41. Desenvolvimento de uma interface grÃfica de usuÃrio para modelos computacionais de exposiÃÃo externa / DEVELOPMENT OF A GRAPHIC USER INTERFACE FOR EXTERNAL EXPOSURE COMPUTATIONAL MODELS
To evaluate the absorbed dose by the patient, in a series of exams, it is necessary to accomplish simulations using an exposure computational model. Such models are fundamentally composed of a virtual representation of the human body (phantom) and a Monte Carlo code. There are several Monte Carlo codes available and also specific voxel phantoms for the two g
Publicado em: 2007
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42. Performance of alternative DenOptix PSPs erasing times on subjective digital image quality / Influencia de tempos alternativos de dessensibilização das placas de fosforo do sistema denoptix na qualidade da imagem digital
The aim on this study was to verify if DenOptix?s phosphor plates alternative erasing times would cause any influence on the image quality and on the diagnosis of approximal caries. Ten human teeth phantoms were radiographed using phosphor plates, partially erased. The chosen erasing times were: 130s, 98s, 66s, 34s, 25s, 20s, 15s, 10s, 5s e 0s. Two observers
Publicado em: 2007
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43. AvaliaÃÃes dosimÃtricas em pacientes submetidos à radioiodoterapia com base em fantomas de Voxels e em imagens de medicina nuclear
In radioiodine therapy, the patients are submitted to the incorporation of a radioactive Sodium Iodide substance (NaI), which reacts physiologically with metastases, thyroid tissue remainders and other organs and tissues of the human body. There is a complex question, which is, the evaluation of the temporal and spatial distribution of the absorbed dose in r
Publicado em: 2007
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44. Estudo comparativo de tres sistemas digitais sem cabo no diagnostico de caries proximais / Comparative study of three wireless digital systems for approximal caries diagnosis
O objetivo, nesse trabalho, foi comparar, de forma objetiva e subjetiva, dois sistemas digitais de placa de armazenamento de fósforo (Digora Optime® e DenOptix®), com o sistema CDR Wireless®, utilizando o filme radiográfico como método radiográfico de referência. Para a análise objetiva, foram obtidas imagens radiográficas de uma escala de densidad
Publicado em: 2007
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45. A 3D Tomographic Reconstruction Model for Agricultural Samples with Wiener Filtering and Parallel Processing / Um modelo de reconstrução tomográfica 3D para amostras agrícolas com filtragem de Wiener em processamento paralelo
Neste trabalho, é apresentado um novo modelo de reconstrução tridimensional (3D) para amostras agrícolas com filtragem de Wiener em processamento paralelo, o qual é obtido a partir de reconstruções tomográficas bidimensionais (2D). No desenvolvimento, foram modelados algoritmos paralelos de retroprojeção filtrada e reconstrução tridimensional, ba
Publicado em: 2007
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46. Implantação de um programa de controle de qualidade para sistemas de planejamento de tratamento computadorizados de acordo com o TRS 430 / Implementation of a quality assurance program for computerized treatment planning systems according to TRS 430
This work presents the guidelines and necessary tests tom implement a quality assurance program for Eclipse 7.3.10 from Varian at Hospital das Clinicas, Sao Paulo University School of Medicine - Brazil, in accordance with the new IAEA publication TRS 430. The recommended tests for the TRS 430 air mainly classified into acceptance tests, commissioning (dosime
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/04/2006
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47. Macro Response Monte Carlo algorithm evaluated through electron spectra. / Avaliação de algoritmo Macro Response Monte Carlo através dos espectros de elétrons
In radiotherapy the computer simulation elapsed time for treatment planning is still a prob- lem. Several techniques for electron transport variance reduction have been developed in order to speed up the calculations. Some of them are: Macro Monte Carlo (MMC), Response History Monte Carlo (RHMC) and Macro Response Monte Carlo (MRMC). All of them use a databa
Publicado em: 2006
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48. Características dosimétricas para campos pequenos, visando a implementação de um sistema postal de controle de qualidade na radiocirurgia / Small fields dosimetric characteristics for the radiosurgical quality control postal system implementation
Radiosurgery is a special technique indicated for small intracranial injuries treatment. For that, a high dose (>20 Gy) from 6 and 10 MV fotons is delivered into a small target volume. The scope of this work is to implement a Quality Control Postal System (QCP) in radiosurgery, in order to evaluate the absorbed dose delivered to the target volume [AAPM (1995
Publicado em: 2006