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Remote RF excitation for small-bore MR imager at 15.2 T.
Vazquez, F; Solis-Najera, S E; Lazovic, J; Zopf, L M; Martin, R; Medina, L; Marrufo, O; Rodriguez, A O.
Afiliação
  • Vazquez F; Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, CdMx 04510, Mexico.
  • Solis-Najera SE; Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, CdMx 04510, Mexico.
  • Lazovic J; Campus Science Support Facilities GmbH, Vienna 1030, Austria.
  • Zopf LM; Campus Science Support Facilities GmbH, Vienna 1030, Austria.
  • Martin R; Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, CdMx 04510, Mexico.
  • Medina L; Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, CdMx 04510, Mexico.
  • Marrufo O; Department of Neuroimage, Instituto Nacional de Neurologia y Neurociruga MVS, CdMx 14269, Mexico.
  • Rodriguez AO; Department of Electrical Engineering, Universidad Autonoma Metropolitana Iztapalapa, CdMx 09340, Mexico. Electronic address: arog@xanum.uam.mx.
J Magn Reson ; 323: 106896, 2021 02.
Article em En | MEDLINE | ID: mdl-33412512
We report a method for remote excitation of the RF signal for preclinical-equivalent ultra high field Magnetic Resonance Imaging (MRI). A parallel-plate waveguide together with a bio-inspired surface coil were used to perform remote excitation experiments to acquire images with a small-bore MR imager at 15.2 T. The imager bore size limits the RF coil transmitter dimensions, so the Gielis super-formula was used to design an RF coil with small dimensions. Electromagnetic simulations of the principal mode were run to study the waveguide filled with air and loaded with a saline solution-filled tube. Radiation patterns were also computed in a semi-anechoic chamber for the same scenarios as above. A saline solution-filled spherical phantom and a formaldehyde-fixed mouse phantom were used to acquire images. Radiation patterns showed an omnidirectional distribution with no side lobes, and a very smooth behaviour with almost no loss of information in the saline solution-filled tube and without. The theoretical wave impedance was calculated and compared with simulated results showing an excellent correspondence. Spherical phantom image data and simulation results of B1 were contrasted and showed an important correlation. Ex vivo mouse images were of high quality and exhibited clear delineation of anatomical structures. These imaging results are in very good agreement with the simulations. Numerical, theoretical and experimental results validate this approach, using a bio-inspired surface coil with a simple waveguide for preclinical small-bore MRI at ultra high field.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Imageamento por Ressonância Magnética Limite: Animals Idioma: En Revista: J Magn Reson Assunto da revista: DIAGNOSTICO POR IMAGEM Ano de publicação: 2021 Tipo de documento: Article País de afiliação: México País de publicação: Estados Unidos
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Imageamento por Ressonância Magnética Limite: Animals Idioma: En Revista: J Magn Reson Assunto da revista: DIAGNOSTICO POR IMAGEM Ano de publicação: 2021 Tipo de documento: Article País de afiliação: México País de publicação: Estados Unidos