Rx coils for high field strengths are mostly based on loop coil design and cover relatively large FOVs, limiting the achievable voxel size due to the SNR and acquisition time constraints. Microstrip coils have limited sensitivity profile along the B1 direction, thus are useful for resolving cortical activity. In this study, we introduce flexible microstrip array insert coils (MSAi) that are compatible with existing volume coils. We demonstrate measurement of BOLD and highly confined activity wide spread in calcarine sulcus and motor cortex using MSAi at 3 T
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