Patent ID: 11963740
Assignee: CANON U.S.A., INC.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 22:
23. A non-transitory computer-readable storage medium storing at least one program that operates to cause one or more processors to execute a method for detecting one or more lumen edges and for detecting one or more stents or stent struts and/or one or more artifacts in at least one image, the method comprising:
using filtered optical coherence tomography (“OCT”) polar coordinate image data to detect one or more of the lumen edges, one or more stents or stent struts, and/or one or more artifacts in the one or more images;
detecting and excluding or removing a sheath from the OCT polar coordinate image data;
finding a major peak and edge in each one-dimensional (1D) data or A-line of the OCT polar coordinate image data, and using the major peak and edge to at least determine whether the major peak and edge correspond to a valid lumen edge of the one or more of the lumen edges using a local lumen edge threshold for the specific 1D data or A-line of the OCT polar coordinate image data, wherein the major peak is the maximum peak or a most significant pulse, and, in a case where the major peak and edge are confirmed to correspond to a valid lumen edge of the one or more of the lumen edges using the local lumen edge threshold and where a plurality of major peaks and edges are confirmed to correspond to one or more valid lumen edges using a respective local lumen edge threshold for each 1D data or A-line of the OCT polar coordinate image data corresponding to one or more of the plurality of major peaks and edges, identify a plurality of lumen edge points for the 1D data or for the OCT polar coordinate image data, and combine the plurality of lumen edge points to form and/or estimate the one or more valid lumen edges;
detecting and removing a guide wire;
detecting and processing one or more stent candidates based on the major peak;
merging and extending a stent region;
calculating a shadow profile and finding or confirming the stent or stent strut and/or a center of the stent or stent strut;
extracting a lumen edge or edges or portions of the lumen edge or edges near a border of the lumen and the one or more stents or stent struts;
interpolating missing data or one or more parts of the extracted lumen edge or edges or of the extracted portions of the lumen edge or edges to form an additional valid lumen edge or edges and combine the additional valid lumen edge or edges with the formed and/or estimated one or more valid lumen edges to create a whole lumen curve;
finding one or more embedded stents or stent struts using the whole lumen curve; and
outputting or storing the lumen edge or edges and/or the whole lumen curve and outputting or storing stent strut information and/or a location of the center of the stent or stent strut.