A lead assembly (100; 600) for an electrical stimulation system, the lead assembly (100; 600) comprising: a lead body (115; 615) having a distal end, a proximal end, a longitudinal length, and a circumference; a spacer disposed along the proximal end of the lead body; a multi-lumen conductor guide extending from the proximal end of the lead body (115; 615) to the distal end of the lead body (115; 615), the multi-lumen conductor guide defining a central lumen and a plurality of conductor lumens disposed around the central lumen, and wherein at least a portion of the multi-lumen conductor guide is twisted and forms at least one helical section with the plurality of conductor lumens forming helical pathways around the central lumen; a plurality of electrodes (125; 625) disposed along the distal end of the lead body (115; 615), the plurality of electrodes (125; 625) comprising a plurality of segmented electrodes (508; 628), wherein each of the plurality of segmented electrodes (508; 628) extends partially around the circumference of the lead body (115; 615); a plurality of terminals (135; 635) disposed along the proximal end of the lead body (115; 615); a plurality of conductors electrically coupling at least one of the plurality of electrodes (125; 625) to at least one of the plurality of terminals (135; 635); at least one distal marker disposed along the distal end of the lead body (115; 615), the distal marker identifying the circumferential position of at least one of the plurality of segmented electrodes (508; 628) along the lead body (115; 615), wherein the distal marker is aligned with the at least one of the plurality of segmented electrodes (508; 628) along the longitudinal length of the lead body (115; 615); and at least one proximal marker disposed along the proximal end of the lead body (115; 615), wherein the proximal marker is aligned with the distal marker along the longitudinal length of the lead body (115; 615), and wherein the at least one proximal marker is disposed on or in the spacer disposed along the proximal end of the lead body (115; 615) such that the at least one proximal marker is disposed distal to the plurality of terminals (135; 635) or wherein the at least one proximal marker is disposed between two adjacent terminals of the plurality of terminals (135; 635); wherein the at least one distal marker and the at least one proximal marker are discontinuous with one another along the lead body (115; 615). a lead body (115; 615) having a distal end, a proximal end, a longitudinal length, and a circumference; a spacer disposed along the proximal end of the lead body; a multi-lumen conductor guide extending from the proximal end of the lead body (115; 615) to the distal end of the lead body (115; 615), the multi-lumen conductor guide defining a central lumen and a plurality of conductor lumens disposed around the central lumen, and wherein at least a portion of the multi-lumen conductor guide is twisted and forms at least one helical section with the plurality of conductor lumens forming helical pathways around the central lumen; a plurality of electrodes (125; 625) disposed along the distal end of the lead body (115; 615), the plurality of electrodes (125; 625) comprising a plurality of segmented electrodes (508; 628), wherein each of the plurality of segmented electrodes (508; 628) extends partially around the circumference of the lead body (115; 615); a plurality of terminals (135; 635) disposed along the proximal end of the lead body (115; 615); a plurality of conductors electrically coupling at least one of the plurality of electrodes (125; 625) to at least one of the plurality of terminals (135; 635); at least one distal marker disposed along the distal end of the lead body (115; 615), the distal marker identifying the circumferential position of at least one of the plurality of segmented electrodes (508; 628) along the lead body (115; 615), wherein the distal marker is aligned with the at least one of the plurality of segmented electrodes (508; 628) along the longitudinal length of the lead body (115; 615); and at least one proximal marker disposed along the proximal end of the lead body (115; 615), wherein the proximal marker is aligned with the distal marker along the longitudinal length of the lead body (115; 615), and wherein the at least one proximal marker is disposed on or in the spacer disposed along the proximal end of the lead body (115; 615) such that the at least one proximal marker is disposed distal to the plurality of terminals (135; 635) or wherein the at least one proximal marker is disposed between two adjacent terminals of the plurality of terminals (135; 635); wherein the at least one distal marker and the at least one proximal marker are discontinuous with one another along the lead body (115; 615).