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

Claim 4:
5. The non-transitory computer-readable storage medium of claim 4, wherein the method further comprises:
obtaining or receiving two-dimensional (2D) A-lines;
constructing 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;
determining 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 calculating 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 setting the NA to be NA=8;
extracting NA equally spaced and perpendicular to catheter or probe cross-section(s) of or from the 3D A-line volume;
detecting a border or borders of the A-line cross-section(s) and/or performing segmentation procedure(s) of the 3D A-line cross-section(s);
determining 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 applying a global correction method or methods to define a new curve for the cross sectional A-line border or borders;
translating the detected border(s) of the A-line cross-section(s) to frame points and linearly interpolating the remaining points of the lumen;
calculating a distance to or of each A-line from the catheter or probe to the lumen border or borders;
transforming the 2D A-line frames and lumen border or borders to OCT frames, or to frames of another set or predetermined imaging modality, or transforming from A-lines to Cartesian coordinates superimposed over their corresponding OCT images; and
determining 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 applying the global correction method or methods or the another global correction method or methods to define a new curve or curves, and completing the transforming.