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Abstract #4403

Tailored cost functions for improved static pTX-based B1+ shimming in 7T cardiac MRI.

Maxim Terekhov1, David Lohr1, Christoph Aigner2, Sebastian Dietrich2, Sebastian Schmitter2, and Laura M. Schreiber1
1Chair of Molecular and Cellular Imaging, Comprehensive Heart Failure Center, University Hospital Würzburg, Wuerzburg, Germany, 2Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Berlin, Germany

Synopsis

Keywords: Parallel Transmit & Multiband, CardiovascularParallel transmit (pTX) technology is an emerging tool for improving of the B1+-field homogeneity in cardiac MRI (cMRI) at the ultra-high magnetic field. In this work, we propose a methodology to enhance the characteristics of the shaped B1+ field using a tailored cost function for the optimization procedure computing complex transmit vectors of magnitudes and phases for driving TX array. Using the cost functions (CF) based on the local B1 gradients with fine-tuning by weighting coefficients allows for considerable improvement of static pTX B1-shimming quality in compared to traditional CF using the coefficient-of-variation (CoV) of B1.

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