Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 1 de 1
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
J Comput Assist Tomogr ; 23(6): 808-20, 1999.
Artigo em Inglês | MEDLINE | ID: mdl-10589553

RESUMO

PURPOSE: The purpose of this report is to describe the design and construction of an 8 T/80 cm whole-body MRI system operating at 340 MHz. METHOD: The 8 T/80 cm magnet was constructed from 414 km of niobium titanium superconducting wire. The winding of this wire on four aluminum formers resulted in a total inductance of 4,155 H. Gradient subsystems included either a body gradient or a head gradient along with a removable shim insert. The magnet and gradient subsystems were interfaced to two spectrometers. These provided the control of the gradient amplifiers and the two sets of four RF power amplifiers. The latter provide in excess of 8 kW of RF power from 10 to 140 MHz and 10 kW of RF power from 245 to 345 MHz. A dedicated computer-controlled patient table was designed and assembled. The entire system is located in a clinical setting, facilitating patient-based studies. RESULTS: The 8 T/80 cm magnet was energized without complication and achieved persistent operation using 198.9 A of current, thereby storing 81.5 MJ of magnetic energy. Exceptional performance was observed for nearly all components both in isolation and when combined within the complete system. CONCLUSION: An 8 T/80 cm MRI system has been assembled. The magnet subsystem is extremely stable and is characterized by good homogeneity and acceptable boil-off rates.


Assuntos
Imageamento por Ressonância Magnética/instrumentação , Alumínio , Amplificadores Eletrônicos , Sistemas Computacionais , Fontes de Energia Elétrica , Eletrônica Médica/instrumentação , Desenho de Equipamento , Cabeça/anatomia & histologia , Humanos , Processamento de Imagem Assistida por Computador/instrumentação , Magnetismo/instrumentação , Nióbio , Proteção Radiológica/instrumentação , Ondas de Rádio , Processamento de Sinais Assistido por Computador , Propriedades de Superfície , Titânio
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...