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

Claim 16:
17. The method of claim 7, wherein one or more of the following:
(i) in the translation step, the segmented 3D A-line cross-section(s) are translated to luminal A-line points;
(ii) in the translation step, the segmented 3D A-line cross-section(s) are translated to luminal A-line points, where the translation of the segmented 3D A-line cross-section(s) to luminal A-line points is based on the following:
(a) each 3D A-line cross-section(s) image corresponds to a specific point of the 2D A-line frames;
(b) each column of a 3D A-line cross-section(s) image corresponds to one of the L number of frames: column 1-frame 1, column 2-frame 2, . . . column L-frame L; and
(c) each point of the detected border line in each 3D A-line cross-section corresponds to a specific point within the depth D of each 2D A-line frame;

(iii) for each 2D A-line frame, NA lumen points, where the default NA=8, are detected which correspond to NA columns of the image: 1, A/(NA−1), A×2/(NA−1), A×3/(NA−1), A×4/(NA−1), A×5/(NA−1), A×6/(NA−1), and A×7/(NA−1); and/or
(iv) to detect the remaining lumen points, a linear interpolation is performed, wherein, for a pair of points (xa,ya), (xb,yb), their linearly interpolated point (x,y) of a known x is calculated as:, y
  =
  
    
      y
      a
    
    +
    
      
        (
        
          
            y
            b
          
          -
          
            y
            a
          
        
        )
      
      ⁢
      
        
          
            x
            -
            
              x
              a
            
          
          
            
              x
              b
            
            -
            
              x
              a
            
          
        
        .