A system, comprising: a device comprising a catheter having a proximal end and a distal end, the distal end of the device for placement into a body lumen, the device comprising a first electrode and a second electrode, each of the first and second electrodes having a proximal end and a distal end, the distal ends of the first and second electrodes located between the proximal and distal ends of the catheter; each of the first and second electrodes (440, 445) serving both an excitation function and a detection function; a processor connected to the first and second electrodes (440, 445) of the device, the processor configured to collect conductance data and to determine a profile of the body lumen, the profile indicative of a change in relative cross-sectional area of the body lumen such that a junction between two lumina can be identified, the conductance data collected at a plurality of locations over a distance within the body lumen and determined at each of the plurality of locations when the distal ends of the first and second electrodes are immersed in a fluid within the body lumen, the conductance data being measured by detecting a change in voltage between the first and the second electrode, the processor using the inversely proportional relationship between voltage difference and cross-sectional area; and wherein said distal ends of said first and second electrodes are located on the catheter, and wherein the device further comprises at least one ablation contact positioned at the distal end of the catheter, the at least one ablation contact being configured to remove or destroy a targeted tissue within the body lumen. a device comprising a catheter having a proximal end and a distal end, the distal end of the device for placement into a body lumen, the device comprising a first electrode and a second electrode, each of the first and second electrodes having a proximal end and a distal end, the distal ends of the first and second electrodes located between the proximal and distal ends of the catheter; each of the first and second electrodes (440, 445) serving both an excitation function and a detection function; a processor connected to the first and second electrodes (440, 445) of the device, the processor configured to collect conductance data and to determine a profile of the body lumen, the profile indicative of a change in relative cross-sectional area of the body lumen such that a junction between two lumina can be identified, the conductance data collected at a plurality of locations over a distance within the body lumen and determined at each of the plurality of locations when the distal ends of the first and second electrodes are immersed in a fluid within the body lumen, the conductance data being measured by detecting a change in voltage between the first and the second electrode, the processor using the inversely proportional relationship between voltage difference and cross-sectional area; and wherein said distal ends of said first and second electrodes are located on the catheter, and wherein the device further comprises at least one ablation contact positioned at the distal end of the catheter, the at least one ablation contact being configured to remove or destroy a targeted tissue within the body lumen.