A magnetic resonance coil has an antenna portion for accommodating a body part to be examined, the antenna portion is formed by a number of constituent units connected in series, the positions between various constituent units are relatively movable. The system includes a handheld device that includes a display device for continuously presenting the live image, wherein movement of the handheld device causes the handheld device to generate an output that controls the robotic motion. In accordance with an embodiment of the invention, for each connection in the network established between a pair of nodes, a normal path ni between the nodes having a rate Ni is established and an alternate, or backup, path bi having a rate Bi is established. A notched test element is formed over the first extrusion monitoring element. The reagent ions may be combined with the analyte ions to perform ion-ion studies such as electron transfer dissociation.