Numerical Evaluation of Radio Frequency Power Deposition in Human Models during MRI

Author

Stuchly, M.A. ; Abrishamkar, H. ; Strydom, M.L.

Author_Institution

Dept. of Electr. & Comput. Eng., Victoria Univ., BC

fYear

2006

fDate

Aug. 30 2006-Sept. 3 2006

Firstpage

272

Lastpage

275

Abstract

Concerns have been expressed about safety of MRI examination of two groups of people, namely pregnant mothers and cardiac pacemaker bearers. The main uncertainty relates to excessive heating by pulsed radio frequency (RF) fields. To address these issues, numerical evaluations of the power deposition are performed for a 27-week old fetus in a simplified model of the mother, and a realistic model of a human torso with an in situ pacemaker including its leads. The evaluations are supplemented with organ dosimetry for a realistic model of the human torso. An ideal non-resonant and two resonant birdcage coils operating at 64 MHz (corresponding to 1.5 T MRI) are evaluated. All simulations are performed with the finite difference time domain (FDTD) method

Keywords

biological effects of fields; biological organs; biomedical MRI; biothermics; cardiology; coils; dosimetry; finite difference time-domain analysis; pacemakers; radiofrequency heating; safety; 1.5 T; 64 MHz; FDTD method; MRI examination safety; birdcage coils; cardiac pacemaker bearers; finite difference time domain method; human models; human torso model; organ dosimetry; pregnant mothers; pulsed radio frequency heating; radio frequency power deposition; Finite difference methods; Heating; Humans; Magnetic resonance imaging; Pacemakers; Pregnancy; Radio frequency; Safety; Torso; Uncertainty;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 2006. EMBS '06. 28th Annual International Conference of the IEEE

Conference_Location

New York, NY

ISSN

1557-170X

Print_ISBN

1-4244-0032-5

Electronic_ISBN

1557-170X

Type

conf

DOI

10.1109/IEMBS.2006.259880

Filename

4461737