Polarized Multi-Channel Transmit MRI to Reduce B1-Shading near Metal Implants
Theresa Bachschmidt 1,2 , Peter Jakob 2 , Markus Vester 1 , Jrgen Nistler 1 , and Mathias Nittka 1
Siemens Healthcare, Erlangen, Germany,
Physics 5, University of Wrzburg, Wrzburg, Germany
Susceptibility-induced artifacts in MR imaging of metal
hip implants can be addressed by methods like SEMAC.
Hence, B1 effects like shading and banding become more
prominent at 3T. This work systematically analyzes B1
modulations and investigates a new approach to reduce
those by means of B1 polarization, using
state-of-the-art multi-channel transmit MRI systems. An
analytical model is verified numerically and in phantom
measurements. It is also used to predict and optimize
signal intensity patterns for spin-echo based sequences
and verified in vivo. This model helps to avoid signal
loss or sharp transitions between hypo- and
hyper-intense signal close to hip implants.
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