Patent ID: 7688677
Filing Date: 2010-03-30
Classification: A61B

Abstract:
1. A method for determining the distance of a transceiver located within a lumen from the center of the lumen and for determining the radius of the lumen, the lumen cross-section being substantially circular at the transceiver location, the method applied on data received from a transceiver placed at a position within the lumen that is distance (r) from the center, the method comprising: transmitting a signal of known velocity (v); receiving two echo signals, the first signal related to a near section of the lumen and the second signal related to an outermost section of the lumen; timing a first time difference between the transmission time of the transmitted signal and reception time of the first echo signal (t calculating the distance of the transceiver from the center of the lumen r using the equation r=(t calculating the radius of the lumen R using the equation R=(t