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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