Fig. 1.

Diagram of an 8-element phased array coil used for MRS. The individual spectra received by each element were shown along with a combined spectrum. Each element in the phased array coil received spectroscopic signals from the voxel of interest with different magnitudes and phases because of different coil sensitivities, phase shifts relative to a common phase reference, and coil/channel noise characteristics. The weighting coefficients w_i = |w_i|e^jϕ_i (i =1,2,...,8) were designed to optimize the SNR of the combined spectrum. Note that the combined spectrum exhibited a significant SNR improvement compared with those from individual elements.