Patent ID: 11922633
Assignee: CANON U.S.A., INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G  A | IPC G

Claim 2:
3. The imaging device of claim 1, wherein the one or more processors further operate to:
obtain or receive two-dimensional (2D) A-lines;
construct a 3D A-line volume matrix from the 2D A-lines, where the 3D A-line volume matrix corresponds to the one or more three-dimensional A-line signals;
determine whether to receive a request to, or to give a user a choice to, increase or decrease the angle interval (AN) of an OCT image from the default angle interval;
in an event that it is determined to receive an increase or decrease request to, or to let the user change, the angle interval (AN), then calculate a number of A-lines (NA) to be NA=360/AN, or, in an event that it is determined to not receive an increase or decrease request, or to not let the user change, the angle interval (AN), then set the NA to be NA=8;
extract NA equally spaced and perpendicular to catheter or probe cross-section(s) of or from the 3D A-line volume;
detect a border or borders of the A-line cross-section(s) and/or perform segmentation procedure(s) of the 3D A-line cross-section(s);
determine whether to manually or automatically correct the detected border or borders of the vessel lumen and/or of the 3D A-line cross-section(s), and in an event that it is determined to manually or automatically correct the detected border or borders, then apply a global correction method or methods to define a new curve for the cross sectional A-line border or borders;
translate the detected border(s) of the A-line cross-section(s) to frame points and linearly interpolate the remaining points of the lumen;
calculate a distance to or of each A-line from the catheter or probe to the lumen border or borders;
transform the 2D A-line frames and lumen border or borders to OCT frames, or to frames of another set or predetermined imaging modality, or transform from A-lines to Cartesian coordinates superimposed over their corresponding OCT images; and
determine whether to perform the global correction method or methods or to perform another global correction method or methods, and in an event that it is determined to perform the global correction method or methods or to perform another global correction method or methods, then apply the global correction method or methods or the another global correction method or methods to define a new curve or curves and complete the transformation.