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Abstract #1675

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

1 Siemens Healthcare, Erlangen, Germany, 2 Experimental 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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