Patent ID: 11950951
Assignee: COVIDIEN LP
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 8:
9. A method for estimating wigwag movement in a C-arm fluoroscope, the method comprising:
receiving fluoroscopic images of a structure of markers from a sweep of the C-arm fluoroscope;
obtaining two-dimensional (2D) samples of each marker of the structure of markers from the fluoroscopic images;
estimating a main movement axis of each marker based on the 2D samples of each marker;
determining a secondary movement axis of each marker based on the main movement axis of each marker;
aligning 2D samples of each marker with the main movement axis and the secondary movement axis for each marker to obtain an aligned signal of each marker;
determining a velocity signal of each marker for a secondary component of the aligned signal of each marker;
converting the velocity signals of the markers to a rotation axis translation signal; and
estimating a rotation axis for the rotation axis translation signal.