The sensor Q Matrix ($$$Q_S$$$) concept is introduced for safe MRI of elongated implants without compromising imaging quality. For this purpose, small and low-cost sensors, parallel transmission (pTx) and the orthogonal projection method are sufficient without the need to perform simulations, safety testing or additional MR imaging. The $$$Q_S$$$ can also be implemented along with other pTx mitigation methods such as null modes. The $$$Q_S$$$ based orthogonal projection method and the null modes method are demonstrated in testbed and MRI experiments.
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