Figure 4

The prototyped RF array. (a) Prototype of the 10-element wireless passive RF resonator array constructed of 10 BCSRRs. Upon the substrate (Kapton), whose flexibility is shown by the instrument in the upper left, 10 SRRs were patterned on one side and 10 aligned but counter-oriented versions were applied to the other side. Critical overlapping distance (0.76D mm center-to-center) was used to reduce the inductive coupling between elements. Strongly coupled elements mainly in superior position were detuned using antiparallel cross diodes. (b) The picture of a standard head coil used in our MRI experiments and position of the array relative to the coil and a head model.