Methods and systems for determining vascular bodily lumen information and guiding medical devices

A method for estimating electrical parameters of an electrical load network, comprising:

• providing an interconnecting network with known electrical parameters, where the interconnecting network connects one or more electrical sources, electrical measurement apparatus at the proximal end, and the electrical load network at the distal end;
• measuring an electrical response via the electrical measurement apparatus for the connected electrical load network;
• and
• de-embedding the electrical effects of the interconnecting network from the measured response to estimate the electrical parameters of the electrical load network;
• wherein the interconnecting network comprises more than two ports,
• wherein a number of unknown electrical parameters in the electrical load network does not exceed a number of ports of the electrical load network.

A method to estimate electrical parameters of an electrical load network comprising:

• providing a plurality of interconnecting networks with known electrical parameters of each, where each of the interconnecting networks connect one or more electrical sources, electrical measurement apparatus at the proximal end, and the electrical load network at the distal end;
• sequentially measuring a plurality of electrical responses via the measurement apparatus for the electrical load network connected distally to each of the plurality of interconnecting networks;
• and,
• determining electrical parameters of the load network from the plurality of measurements by de-embedding the electrical effects of the corresponding interconnecting network;
• wherein each of the interconnecting networks comprises more than two ports;
• wherein the electrical load network comprises more than one port.

A method for estimating electrical parameters of an electrical load network, comprising:

• providing an interconnecting network, that connects one or more electrical sources, electrical measurement apparatus at a proximal end, and the electrical load network at a distal end, wherein the interconnecting network comprises a connection of a plurality of sub-networks having predetermined initial electrical parameters;
• measuring an electrical response via the electrical measurement apparatus for the connected electrical toad network;
• combining effects of each of the plurality of sub-networks to obtain an equivalent electrical effect of a combined interconnecting network;
• and,
• de-embedding electrical effects of the combined interconnecting network from the measured response to estimate electrical parameters of the electrical load network,
• wherein at least one of the plurality of sub-networks comprises more than two ports.