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. Author manuscript; available in PMC: 2015 Nov 1.
Published in final edited form as: J Magn Reson Imaging. 2014 Jan 24;40(5):1165–1173. doi: 10.1002/jmri.24473

Figure 1.

Figure 1

Comparison of modeled |B1+| as a function of field strength produced by a Helmholtz coil with an asymmetric load that mimics imaging the pendant breast proximal to the thorax. (a) Rendering of the conventional, parallel-fed Helmholtz coil with an asymmetric phantom comprised of the electrical characteristics of breast tissue inside and the thorax above. (b) Profiles through the marked areas in (c)-(e) depicting |B1+| at 1.5T (63.9MHz), 3.0T (128MHz), and 7.0T (298MHz). The effects of the asymmetric loading of the thorax on the current distribution on the two loops of the Helmholtz coil increases with frequency, resulting in a 6dB fall off towards the thorax at 7.0T.