Voxel Phantom
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Development of a mouse computational model for MCNPx based on Digimouse (r) images and dosimetric assays
ABSTRACT The aim of this study was to create and test a new mice 3D-voxel phantom named DM_BRA for mice and human first-estimation radiopharmaceutical dosimetry. Previously, the article reviews the state-of-art in animal model development. Images from Digimouse CT database were used in the segmentation and on the generation of the voxelized phantom. Simulati
Braz. J. Pharm. Sci.. Publicado em: 20/04/2017
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2. Estudo comparativo de dosimetria computacional entre modelos homogêneos e um modelo voxel em mamografia: uma discussão de aplicações em testes de constância e cálculo de dose glandular em pacientes
OBJETIVO: Comparar dados de dosimetria e fluência de fótons entre diferentes modelos de mama, discutindo as aplicações em testes de constância e estudos dosimétricos aplicados à mamografia. MATERIAIS E MÉTODOS: Foram simulados diferentes modelos homogêneos e um modelo antropomórfico de mama tipo voxel, sendo contabilizadas: a dose total absorvida n
Radiologia Brasileira. Publicado em: 2010-12
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3. Desenvolvimento de um modelo computacional para avaliaÃÃes dosimÃtricas em ratos
Rats are commonly used as experimental models in preclinical tests in Nuclear Medicine. Therefore, it is of great importance to accomplish precise absorbed dose estimates in these small animals, for explanation and control of potential radiation toxicity, observed during the tests. In this work, a tomographic model of an adult male Wistar rat was developed s
Publicado em: 2008
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4. Modelagem computacional de estruturas anatômicas em 3D e simulação de suas imagens radiográficas / Computational 3D modelling of anatomic structures and simulation of its radiography images
The conventional methods of quality control applied to radio diagnosis are the best way to have assured good quality of the produced images. Due the amount of variables to consider, the study of particular issues of the process of formation of radiological images requires complementary computational tools. However, the computational voxel based phantoms are
Publicado em: 2008
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5. 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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6. 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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7. Development of a computacional model for calculations of absorved dose to organs and tissues of the human body in situations of accidental exposures / Desenvolvimento de um modelo computacional para cÃlculos de dose absorvida em ÃrgÃos e tecidos do corpo humano nas situaÃÃes de exposiÃÃes acidentais
Exposure to a radiation field may be of medical, environmental, occupational or accidental nature, but in all cases the main objective is the determination of the whole body absorbed dose or the distribution of absorbed dose to specific organs and tissues. In recent years, estimates of the radiation absorbed dose in the human body have become more accurate d
Publicado em: 2006
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8. Evaluation of the fluence to dose conversion coefficients for high energy neutrons using a voxel phantom coupled with the GEANT4 code
Crews working on present-day jet aircraft are a large occupationally exposed group with a relatively high average effective dose from galactic cosmic radiation. Crews of future high-speed commercial flying at higher altitudes would be even more exposed. To help reduce the significant uncertainties in calculations of such exposures, the male adult voxels phan
Brazilian Journal of Physics. Publicado em: 2005-09
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9. Voxel-based model construction from colored tomographic images / ConstruÃÃo de simuladores baseados em elementos de volume a partir de imagens tomogrÃficas coloridas
This work presents a new approach in the construction of voxel-based phantoms that was implemented to simplify the segmentation process of organs and tissues reducing the time used in this procedure. The segmentation process is performed by painting tomographic images and attributing a different color for each organ or tissue. A voxel-based head and neck pha
Publicado em: 2002