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Effect of body coil electric field distribution on receive‐only surface coil heating
Author(s) -
Guclu C. Celil
Publication year - 2001
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1211
Subject(s) - electromagnetic coil , electric field , specific absorption rate , voltage , coil noise , homogeneity (statistics) , radiofrequency coil , materials science , acoustics , decoupling (probability) , field (mathematics) , nuclear magnetic resonance , rogowski coil , optics , electrical engineering , physics , computer science , engineering , mathematics , quantum mechanics , control engineering , machine learning , antenna (radio) , pure mathematics
Although in the design of transmit RF coils, B 1 homogeneity is crucial for good image quality, discussion of electric field (E‐field) distribution in the literature has been mostly limited to specific absorption rate (SAR) and patient loading (dielectric) effects. In this work, we report on a different aspect of E‐field: the receive‐only surface coil heating resulting from the voltage drop across the blocking (decoupling) networks and cable traps that are used to minimize the transmit field distortion. The results show that the z‐component (parallel to the coil cable) of the E‐field has a significant effect on the temperature rise in the surface coil. Therefore, in the receive‐only coil designs, it is not sufficient to consider only the induced voltage on the coil loop due to the B 1 field, as is generally done in blocking network analysis calculations. The body coil E‐field distribution must be considered as well. J. Magn. Reson. Imaging 2001;14:484–487. © 2001 Wiley‐Liss, Inc.