Abstract #4931
On the E-field construction/deconstruction and B1+ Efficiency/Homogeneity with Transmit Array Eigen Modes
Yujuan Zhao 1 , Tiejun Zhao 2 , Narayanan Krishnamurthy 1 , and Tamer S. Ibrahim 1
1
University of Pittsburgh, Pittsburgh, PA,
United States,
2
Siemens
Medical Solutions, Pittsburgh, PA, United States
The inhomogeneous distribution of the excitation field
(B1+) and the potential rise in local RF absorption
(SAR) are two of the major obstacles hampering potential
clinical applications of the ultrahigh field human MRI
(7T and higher.) Ideally, the quadrature excitation
construction will give the most efficient B1+ field and
the destruction of the central E fields will generate
less SAR (less power absorptions. While there could be
many different optimization solutions (we include many
of which into several of our in-vivo studies) for the RF
excitation that achieve a very similar fidelity to the
targeted excitation pattern (homogenous B1+ field),
minimizing the local SAR and maximizing the B1+
efficiency are two of the most important constraints of
the optimization procedure.
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