An electrode assembly for an electrode catheter system, the electrode assembly having a longitudinal axis, a proximal end and a distal end, the electrode assembly comprising: a plurality of struts extending coextensively with each other from the proximal end to the distal end of the electrode assembly, each strut having a corresponding electrode disposed thereon and spaced longitudinally from the proximal end of the electrode assembly, the longitudinal spacing of one of the electrodes from the proximal end of the electrode assembly being different from the longitudinal spacing of at least another one of the electrodes from the proximal end of the electrode assembly; each strut comprises a longer leg and a shorter leg, the hinge of the strut being intermediate the longer leg and the shorter leg, the longer leg of at least one of the struts extending from the proximal end of the electrode assembly to the hinge and the shorter leg of said at least one of the struts extending from the distal end of the electrode assembly to the hinge; the struts circumferentially alternate which of the longer or shorter legs (103, 105) extends from the proximal end of the electrode assembly to facilitate the struts being capable of a closely spaced relationship with each other upon compressing down of the electrode assembly; wherein the electrode assembly is configurable between a collapsed configuration and an expanded configuration, the electrodes being transversely spaced from the longitudinal axis of the electrode assembly a greater distance in the expanded configuration than in the collapsed configuration, in the expanded configuration, the electrodes being transversely spaced from the longitudinal axis of the electrode assembly approximately the same distance. a plurality of struts extending coextensively with each other from the proximal end to the distal end of the electrode assembly, each strut having a corresponding electrode disposed thereon and spaced longitudinally from the proximal end of the electrode assembly, the longitudinal spacing of one of the electrodes from the proximal end of the electrode assembly being different from the longitudinal spacing of at least another one of the electrodes from the proximal end of the electrode assembly; each strut comprises a longer leg and a shorter leg, the hinge of the strut being intermediate the longer leg and the shorter leg, the longer leg of at least one of the struts extending from the proximal end of the electrode assembly to the hinge and the shorter leg of said at least one of the struts extending from the distal end of the electrode assembly to the hinge; the struts circumferentially alternate which of the longer or shorter legs (103, 105) extends from the proximal end of the electrode assembly to facilitate the struts being capable of a closely spaced relationship with each other upon compressing down of the electrode assembly; wherein the electrode assembly is configurable between a collapsed configuration and an expanded configuration, the electrodes being transversely spaced from the longitudinal axis of the electrode assembly a greater distance in the expanded configuration than in the collapsed configuration, in the expanded configuration, the electrodes being transversely spaced from the longitudinal axis of the electrode assembly approximately the same distance.