Premium
Quantitative assessment of the effects of high‐permittivity pads in 7 Tesla MRI of the brain
Author(s) -
Teeuwisse Wouter M.,
Brink Wyger M.,
Webb Andrew G.
Publication year - 2012
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.23108
Subject(s) - specific absorption rate , permittivity , electromagnetic coil , nuclear magnetic resonance , materials science , homogeneity (statistics) , dielectric , homogenization (climate) , physics , computer science , optoelectronics , telecommunications , quantum mechanics , machine learning , antenna (radio) , biodiversity , ecology , biology
The use of high‐permittivity materials has been shown to be an effective method for increasing transmit and receive sensitivity in areas of low‐signal intensity in the brain at high field. Results in this article show that the use of these materials does not increase the intercoil coupling for a phased array receive coil, does not have any detrimental effects on the B 0 homogeneity within the brain, and does not affect the specific absorption rate distribution within the head. Areas of the brain close to the pads exhibit significant increases (>100%) in transmit field efficiency, but areas further away show a less pronounced (∼10%) decrease due to the homogenization of the transmit field and the loss introduced by the dielectric pads. Magn Reson Med, 2012. © 2011 Wiley Periodicals, Inc.