Local TX and RX Shimming for Improved Conductivity Imaging

Phase-based Electric Properties Tomography (EPT) can be used to measure the conductivity of tissue in vivo. However, the method is limited by the assumption that both receive (RX) and transmit (TX) radiofrequency fields are spatially homogenous. Here, it is shown that the systematic errors of phase-based EPT can be reduced by using a local, offline shimming procedure. It utilizes B1-mapping and the additional degrees of freedom present in multi-TX/RX systems. A primary goal of the technique is to improve conductivity imaging of breast tumors.

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