Travelling wave approach for high field magnetic resonance imaging

Author

Elabyad, Ibrahim A. ; Omar, A. ; Herrmann, T. ; Mallow, J. ; Bernarding, J.

Author_Institution

Microwave & Commun. Eng., Univ. of Magdeburg, Magdeburg, Germany

fYear

2010

fDate

7-10 Nov. 2010

Firstpage

1

Lastpage

5

Abstract

A theoretical investigation of the travelling-wave approach for high field magnetic resonance imaging (MRI) is presented. The travelling wave probes excite the fields in the longitudinal direction of the bore, so that the effects of the attenuation constant due to high permittivity and lossy tissue need to be calculated. In addition, the travelling wave modes should affect the B₁⁺ field homogeneity inside high permittivity and lossy tissue. The full-field solution of infinite waveguide loaded with a lossy dielectric cylinder for 7T travelling wave phenomenon is presented. The transcendental equation was solved numerically to find the attenuation and propagation constants. Results indicate that, the B₁⁺ field is independent of the antenna type, other than the magnitude as the purpose is just exciting modes. In this paper, the traveling wave probes were designed, fabricated, and tested for 7-tesla (7T) MRI.

Keywords

biomedical MRI; biomedical equipment; permittivity; radiowave propagation; waveguide theory; 7-tesla MRI; antenna type; attenuation constant; full field solution; high field magnetic resonance imaging; infinite waveguide; longitudinal direction; lossy dielectric cylinder; permittivity; propagation constant; transcendental equation; travelling wave; travelling wave probe; 7-tesla (7T) MRI; RF-shield; Transcendental equation; Travelling RF-probes; Travelling-wave approach;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Sciences in Biomedical and Communication Technologies (ISABEL), 2010 3rd International Symposium on

Conference_Location

Rome

Print_ISBN

978-1-4244-8131-6

Type

conf

DOI

10.1109/ISABEL.2010.5702899

Filename

5702899