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B 1 + shimming is an important method for mitigating B inhomogeneity in high-field MRI. Using independent power amplifiers for each transmit (Tx) element is the preferred method for B shimming but comes with a high cost. Conversely, the simplest approach to control a Tx array is by using coaxial cables of varying length in the Tx chain, but this approach is cumbersome and impractical for dynamic shimming. In this article, a system is described that enables dynamic, phase-only, eight-channel B 1 + steering on a 7T MR scanner with only tw
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