Asymmetrically segmented loop phased coil for uniform RF field excitation at 7T

An asymmetric distributed capacitor capacitance loop array structure that generated highly homogenous B1 field for 7T MRI was presented. The calculated B1 field uniformity and coil sensitivity of the proposed coil was superior to the identical size loop array with symmetrically distributed capacitance as well as the stripline array coil with the same length. The volume shaped array loop coil assembly, consisting of the proposed asymmetric distributed capacitance coil design loops, was confirmed both through testing as well as confirmed our approach through B1+ field simulation study. Also, the proposed design will potentially help the construction of larger size loop arrays to cover more imaging volume at very high fields and obtain uniform coverage and high sensitivity.

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