Your browser doesn't support javascript.
loading
Scalable and modular 8-channel transmit and 8-channel flexible receive coil array for 19 F MRI of large animals.
Özen, Ali Caglar; Spreter, Felix; Schimpf, Waldemar; Fischer, Johannes; Ilbey, Serhat; Reiss, Simon; Maier, Alexander; von Elverfeldt, Dominik; Heidt, Timo; von Zur Mühlen, Constantin; Bock, Michael.
Afiliação
  • Özen AC; Department of Radiology, Medical Physics, Medical Center-University of Freiburg, University of Freiburg, Freiburg, Germany.
  • Spreter F; Department of Radiology, Medical Physics, Medical Center-University of Freiburg, University of Freiburg, Freiburg, Germany.
  • Schimpf W; Department of Radiology, Medical Physics, Medical Center-University of Freiburg, University of Freiburg, Freiburg, Germany.
  • Fischer J; Department of Radiology, Medical Physics, Medical Center-University of Freiburg, University of Freiburg, Freiburg, Germany.
  • Ilbey S; Department of Radiology, Medical Physics, Medical Center-University of Freiburg, University of Freiburg, Freiburg, Germany.
  • Reiss S; Department of Radiology, Medical Physics, Medical Center-University of Freiburg, University of Freiburg, Freiburg, Germany.
  • Maier A; Department of Cardiology and Angiology I, University Heart Center, Medical Center-University of Freiburg, University of Freiburg, Freiburg, Germany.
  • von Elverfeldt D; Department of Radiology, Medical Physics, Medical Center-University of Freiburg, University of Freiburg, Freiburg, Germany.
  • Heidt T; Department of Cardiology and Angiology I, University Heart Center, Medical Center-University of Freiburg, University of Freiburg, Freiburg, Germany.
  • von Zur Mühlen C; Department of Cardiology and Angiology I, University Heart Center, Medical Center-University of Freiburg, University of Freiburg, Freiburg, Germany.
  • Bock M; Department of Radiology, Medical Physics, Medical Center-University of Freiburg, University of Freiburg, Freiburg, Germany.
Magn Reson Med ; 89(3): 1237-1250, 2023 03.
Article em En | MEDLINE | ID: mdl-36226654
ABSTRACT

PURPOSE:

To introduce an RF coil system consisting of an 8-channel transmit (Tx) and 8-channel receive (Rx) coil arrays for 19 F MRI of large animals.

METHODS:

The Tx efficiency and homogeneity of the 8-element loop coil array (loop size 6 × 15 cm2 ) were simulated for two different pig models rendered from MR images. An 8-channel Rx coil array consisting of a flexible 6-channel posterior and a 2-channel planar anterior array was designed to fit on the abdomen of an average-sized pig in supine position. Measurements were performed in a grid phantom and ex vivo on a pig model with perfluoroctylbromide (PFOB)-filled tubes inserted in the thorax.

RESULTS:

Measured and simulated Tx efficiency and homogeneity for the 8-channel and 5-channel arrays were in good agreement 1.87 ± 0.22µT/√kW versus 1.96 ± 0.29µT/√kW, and 2.29 ± 0.39µT/√kW versus 2.41 ± 0.37µT/√kW. An isolation of 38 ± 8 dB is achieved between the 19 F Tx and Rx elements, and over 30 dB between the 1 H and 19 F elements. The PFOB-filled vials could be clearly identified within the cadaver abdomen with an SNR of 275 ± 51 for a 3D gradient-echo sequence with 2-mm isotropic resolution and 12 averages, acquired in 952 mins. Performance of the Tx array was robust against phase and amplitude mismatches at the input ports.

CONCLUSIONS:

A modular and scalable Tx array offers improved Tx efficiency in 19 F MRI of large animals with various sizes. Although conventional birdcage coils have superior Tx efficiency within the target region of interest, scalability of the Tx array to animal size is a major benefit. The described 19 F coil provides homogeneous excitation and high sensitivity detection in large pig models.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Ondas de Rádio / Imageamento por Ressonância Magnética Limite: Animals Idioma: En Revista: Magn Reson Med Assunto da revista: DIAGNOSTICO POR IMAGEM Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Alemanha

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Ondas de Rádio / Imageamento por Ressonância Magnética Limite: Animals Idioma: En Revista: Magn Reson Med Assunto da revista: DIAGNOSTICO POR IMAGEM Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Alemanha