Injection-less methods to determine-cross-sectional areas using multiple frequencies

-29. (canceled)

A method, comprising the steps of:

• sequentially introducing a first signal having a first frequency, a second signal having a second frequency, and a third signal having a third frequency into a luminal organ using a device and detecting conductance data in connection with each signal using the device;
• and
• determining a cross-sectional area of the mammalian luminal organ based upon the conductance data in connection with each signal, a conductivity of fluid within the luminal organ, and a known distance between detection elements of the impedance detector.

(canceled)

A method, comprising the steps of:

• operating an impedance device to introduce a combined stimulating signal through the detection device into a luminal organ, the combined stimulating signal comprising a first signal having a first frequency, a second signal having a second frequency, and a third signal having a third frequency, and obtaining output conductance data in connection with each of the three signals using an impedance detector of the impedance device;
• and
• determining a cross-sectional area of the luminal organ based upon the output conductance data in connection with each of the three signals, a conductivity of blood within the luminal organ, and a known distance between detection elements of the impedance detector.

-38. (canceled)

(canceled)