Figure 1.

3D drawings of the endorectal coil without any balloon (a), with the inner balloon (b) and with the inner and outer balloon present (c). The ³¹P Tx/Rx loop is positioned between the balloons while the ¹H Rx elements is attached to the rod inside the inner balloon. The corresponding photos of the actual coil are depicted in d, e, and f. A schematic cross section of the asymmetric ¹H microstrip (g) shows its orientation and geometry. The copper colored (online version only) parts indicate the conducting line and ground plane. [Color figure can be viewed at http://www.wileyonlinelibrary.com]