New design concept of monopole antenna array for UHF 7T MRI.
Magn Reson Med
; 71(5): 1944-52, 2014 May.
Article
em En
| MEDLINE
| ID: mdl-23818275
ABSTRACT
PURPOSE:
We have developed and evaluated a monopole antenna array that can increase sensitivity at the center of the brain for 7T MRI applications.METHODS:
We have developed a monopole antenna array that has half the length of a conventional dipole antenna with eight channels for brain imaging with a 7T MRI. The eight-channel monopole antenna array and conventional eight-channel transceiver surface coil array were evaluated and compared in terms of transmit properties, specific absorption ratio (SAR), and sensitivity. The sensitivity maps were generated by dividing the SNR map by the flip angle distribution.RESULTS:
A single surface coil provides asymmetric sensitivity resulting in reduced sensitivity at the center of the brain. In contrast, a single monopole antenna provides higher sensitivity at the center of the brain. Moreover, the monopole antenna array provides uniform sensitivity over the entire brain, and the sensitivity gain was 1.5 times higher at the center of the brain compared with the surface coil array.CONCLUSION:
The monopole antenna array is a promising candidate for MRI applications, especially for brain imaging in a 7T MRI because it provides increased sensitivity at the center of the brain.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Transdutores
/
Encéfalo
/
Aumento da Imagem
/
Análise de Falha de Equipamento
/
Magnetismo
Tipo de estudo:
Diagnostic_studies
Limite:
Humans
Idioma:
En
Revista:
Magn Reson Med
Assunto da revista:
DIAGNOSTICO POR IMAGEM
Ano de publicação:
2014
Tipo de documento:
Article