Direct Derivation of Multi-Channel Receive Coil Sensitivity

Most of the literature on signal reception in magnetic resonance treats the reception mechanism utilizing the reciprocity theorem, according to which the receive sensitivity of the channels can be assessed through the transmit sensitivity of the same very array. In modern MRI receive phased array there are additional circuits attaches to the antennas, so that intuitively is difficult to follow the receive path through the reciprocity theory standpoint. We propose a direct method of deriving the receive sensitivity which we find more intuitive for MRI coil signal characterization, directly applicable when describing additional circuitry attached to the multichannel phased array.

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