A comparative numerical study of rotating and stationary RF coils in terms of flip angle and specific absorption rate for 7T MRI

2013 ◽  
Vol 236 ◽  
pp. 70-82 ◽  
Author(s):  
A. Trakic ◽  
J. Jin ◽  
M.Y. Li ◽  
D. McClymont ◽  
E. Weber ◽  
...  
Keyword(s):  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Numerical Study ◽  
Flip Angle ◽  
Rf Coils ◽  
Specific Absorption

EVALUATION OF SPECIFIC ABSORPTION RATE IN THE FAR-FIELD, NEAR-TO-FAR FIELD AND NEAR-FIELD REGIONS FOR INTEGRATIVE RADIOFREQUENCY EXPOSURE ASSESSMENT

2020 ◽  
Vol 190 (4) ◽  
pp. 459-472 ◽  
Author(s):  
Ilaria Liorni ◽  
Myles Capstick ◽  
Luuk van Wel ◽  
Joe Wiart ◽  
Wout Joseph ◽  
...  
Keyword(s):  
Large Scale ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Numerical Study ◽  
Whole Body ◽  
Single Frequency ◽  
Far Field ◽  
Specific Absorption ◽  
Rf Systems ◽  
Body Tissues

Abstract The specific absorption rate (SAR) induced by wireless radiofrequency (RF) systems depends on different parameters. Previously, SAR was mainly assessed under conditions of a single frequency and technology and for a limited number of localized RF sources. The current and emerging mobile systems involve a wider range of usage scenarios and are frequently used simultaneously, leading to combined exposures for which almost no exposure evaluation exists. The aim and novelty of this study is to close this gap of knowledge by developing new methods to rapidly evaluate the SAR induced by RF systems in such scenarios at frequencies from 50 MHz to 5.5 GHz. To this aim, analytical methods for SAR estimation in several usage scenarios were derived through a large-scale numerical study. These include subject-specific characteristics, properties of the RF systems and provide an estimation of the SAR in the whole body, tissues and organs, and different brain regions.

Variability of Specific Absorption Rate of Human Body for Various Configurations of Tablet Computer in Vicinity of Abdomen

2015 ◽  
Vol E98.B (7) ◽  
pp. 1173-1181 ◽  
Author(s):  
Akihiro TATENO ◽  
Tomoaki NAGAOKA ◽  
Kazuyuki SAITO ◽  
Soichi WATANABE ◽  
Masaharu TAKAHASHI ◽  
...  
Keyword(s):  
Human Body ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Tablet Computer ◽  
Specific Absorption
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