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. Author manuscript; available in PMC: 2010 Aug 31.
Published in final edited form as: Magn Reson Imaging. 2006 May 26;24(6):819–823. doi: 10.1016/j.mri.2006.01.010

Fig. 1.

Fig. 1

Circuit diagram of a coil element in the LN2 cooled phased array. RC, L1, C1, C2 and C3 comprise the RF coil tuning and matching circuitry. L3 and C3 are the regular blocking circuits used in phased array coils. L2, C2, L4 and D form an additional blocking circuitry activated during RF transmission. L4 is a choke. This additional blocking circuitry is needed since the C3 value increases significantly in LN2 cooled coil, lowering its associated impedance to a value comparable with RP. This reduces the parallel resonance impedance as well as the current-blocking ability of the L3 – C3 circuit and allows coupling between the coil element and the RF transmission coil that can cause B1 inhomogeneity image artifacts.