Phantoms
Mostrando 1-12 de 72 artigos, teses e dissertações.
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1. Ultrasound guided endoscopic combined Intrarenal surgery – 10 steps for the success
ABSTRACT Background: Endoscopic combined intrarenal surgery (ECIRS) has been used to treat complex kidney stones (1). The combined use of ultrasound (US) has the potential to improve safety and reduce radiation exposure, however, it is still underutilized (2). Objectives: Our objective is to describe, in a step-by-step manner, the ultrasound-guided ECIRS (
International braz j urol. Publicado em: 2022
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2. Phantoms for diffusion-weighted imaging and diffusion tensor imaging quality control: a review and new perspectives
Abstract: Introduction Diffusion-weighted imaging (DWI) and diffusion tensor imaging (DTI) combine magnetic resonance imaging (MRI) techniques and diffusion measures. In DWI, the contrast is defined by microscopic motion of water protons. Nowadays, DWI has become important for early diagnostic of acute stroke. DTI images are calculated from DWI images acqui
Res. Biomed. Eng.. Publicado em: 2017-06
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3. Realistic deformable 3D numeric phantom for transcutaneous ultrasound
Abstract Introduction Numerical phantoms are important tools to design, calibrate and evaluate several methods in various image-processing applications, such as echocardiography and mammography. We present a framework for creating ultrasound numerical deformable phantoms based on Finite Element Method (FEM), Linear Isomorphism and Field II. The proposed met
Res. Biomed. Eng.. Publicado em: 16/03/2017
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4. Comparative study of periodicity estimation methods using ultrasonic signals
Abstract Introduction Various signal-processing techniques have been proposed to extract quantitative information about internal structures of tissues from the original radio frequency (RF) signals instead of an ultrasound image. The quantifiable parameter called the mean scatterer spacing (MSS) can be useful to detect changes in the quasi-periodic microstr
Res. Biomed. Eng.. Publicado em: 09/09/2016
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5. Accuracy of magnetic resonance imaging for measuring maturing cartilage: A phantom study
OBJECTIVES: To evaluate the accuracy of magnetic resonance imaging measurements of cartilage tissue-mimicking phantoms and to determine a combination of magnetic resonance imaging parameters to optimize accuracy while minimizing scan time. METHOD: Edge dimensions from 4 rectangular agar phantoms ranging from 10.5 to 14.5 mm in length and 1.25 to 5.5 mm in
Clinics. Publicado em: 2016-07
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6. Generation of 3D ultrasound biomicroscopic images: technique validation and in vivo volumetric imaging of rat lateral gastrocnemius
Introduction Ultrasound biomicroscopy (UBM) is a technique for generating high-resolution images, with frequencies from 20 MHz to 100 MHz. For example, it has been used in animal research related to models of injury and diseases that mimic human conditions. With a three-dimensional ultrasound (3D) image system, an organ can be viewed at various angles and t
Res. Biomed. Eng.. Publicado em: 2015-04
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7. Evaluation of nuclear magnetic resonance spectroscopy variability
INTRODUCTION: The intrinsically high sensitivity of Magnetic Resonance Spectroscopy (MRS) causes considerable variability in metabolite quantification. In this study, we evaluated the variability of MRS in two research centers using the same model of magnetic resonance image scanner. METHODS: Two metabolic phantoms were created to simulate magnetic resonance
Rev. Bras. Eng. Bioméd.. Publicado em: 2014-09
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8. Atherosclerotic plaque characterization using plaque area variation in IVUS images during compression: a computational investigation
INTRODUCTION: The rupture of atherosclerotic plaques causes millions of death yearly. It is known that the kind of predominant tissue is associated with its dangerousness. In addition, the mechanical properties of plaques have been proved to be a good parameter to characterize the type of tissue, important information for therapeutic decisions. METHODS: Ther
Rev. Bras. Eng. Bioméd.. Publicado em: 2014-06
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9. Does Stone Entrapment With "Uro-Net" Improve Ho:YAG Laser Lithotripsy Efficiency in Percutaneous Nephrolithotomy and Cystolithopaxy?: an In Vitro Study
Purpose to test the effect of stone entrapment on laser lithotripsy efficiency. Materials and Methods Spherical stone phantoms were created using the BegoStone® plaster. Lithotripsy of one stone (1.0g) per test jar was performed with Ho:YAG laser (365µm fiber; 1 minute/trial). Four laser settings were tested: I-0.8J,8Hz; II-0.2J,50Hz; III-0.5J,50Hz; IV-
Int. braz j urol.. Publicado em: 2013-07
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10. Processamento de estruturas tridimensionais de Medicina Nuclear na modalidade PET
A Medicina Nuclear, como especialidade de obtenção de imagens médicas é um dos principais procedimentos utilizados hoje nos centros de saúde, tendo como grande vantagem a capacidade de analisar o comportamento metabólico do paciente. Este projeto está baseado em imagens médicas obtidas através da modalidade PET (Positron Emission Tomography). Para i
Rev. Bras. Eng. Bioméd.. Publicado em: 2013-03
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11. Fantasmas da tradição: João Cruz Costa e a cultura filosófica uspiana em formação / Phantoms of tradition: João Cruz Costa and the philosophical USPian culture in formation
Este trabalho reconstitui e examina a trajetória intelectual de João Cruz Costa, um dos primeiros professores da Faculdade de Filosofia, Ciências e Letras da Universidade de São Paulo (FFCL/USP) após o encerramento da missão francesa no curso de Filosofia da referida instituição. O objetivo principal da tese reside, assim, no exame do itinerário e d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/08/2012
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12. Re-engenharia do software SCMS para uma linguagem orientada a objetos (Java) para uso em construções de phantoms segmentados / Reengineering the SCMS software for object-oriented language (JAVA) to use in creating phantoms segmented
Metodologias recentes de planejamento dependem fortemente de imagens de tomografia computadorizada e a tendência é que os procedimentos de dosimetria interna na terapia usando medicina nuclear também sejam baseados em imagens, tais como, imagens de ressonância magnética (RM) e tomografia computadorizada (TC), que extraem informações anatômicas e hist
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2012