Voxel Phantoms
Mostrando 1-9 de 9 artigos, teses e dissertações.
-
1. Reconstrução de objetos simuladores segmentados aplicáveis à dosimetria de pele / Reconstruction of voxel phantoms for skin dosimetry
A radioterapia é uma modalidade terapêutica que utiliza radiações ionizantes para erradicar as células neoplásicas do organismo humano. Um dos requisitos para o sucesso desta metodologia de tratamento está na utilização adequada dos sistemas de planejamento, os quais, dentre outras informações, estimam a dose a ser administrada aos pacientes. Atua
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/12/2010
-
2. A clinical gamma camera-based pinhole collimated system for high resolution small animal SPECT imaging
The main objective of the present study was to upgrade a clinical gamma camera to obtain high resolution tomographic images of small animal organs. The system is based on a clinical gamma camera to which we have adapted a special-purpose pinhole collimator and a device for positioning and rotating the target based on a computer-controlled step motor. We deve
Brazilian Journal of Medical and Biological Research. Publicado em: 2010-12
-
3. 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
-
4. 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
-
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
-
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
-
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
-
8. 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
-
9. Refinement of the 2D-segmentation of the left cardiac ventricle in magnetic resonance images using simulated annealing / Refinamento da segmentação 2D do ventrículo esquerdo em imagens de ressonância magnética utilizando "simulated annealing"
Diseases in complex organs like the heart require suitable analysis tools for diagnosis, therapy and patient attendance. An emerging area of interest in image processing are quantitative techniques that provide accurate data about the size, position and other parameters concerning these organs. It is not possible to apply these techniques if no accurate iden
Publicado em: 1998