| 摘要 |
A method to visualize and correct alignment errors between paired 2D and 3D data sets is described. In a representative embodiment, a display interface used for dental implant planning includes one or more display areas that enable the operator to visualize alignment errors between the paired 2D and 3D data sets. A first display area renders 3D cone beam data. A second display area renders one or more (and preferably three (3) mutually orthogonal views) slices of the cone beam data. A third display area displays a view of a 2D scanned surface map (obtained from an intra-oral scan, or the scan of a model). According to a first aspect, the view of the 2D scanned surface map in the third display area is“textured”by coloring the 2D surface model based on the intensity of each 3D pixel (or“voxel”) that it intersects. The textured view provides the operator with a unique perspective to conform alignment using the visualized hard and soft tissue landmarks. In addition, and according to a second aspect, each of the preferably mutually orthogonal cone view data slices is overlaid with a wireframe projection from the 2D surface model data. The operator can rotate and move the 2D surface model in any view by clicking and dragging with a data entry device (such as a mouse or keyboard). The visualizations update, preferably in real-time, as one data set is transformed with respect to the other. When the alignment is accurate, the contrast at the gum line of the teeth in the 2D scan is high, because teeth and soft tissue exhibit different intensities in the cone beam data. If the alignment is poor, the change in contrast occurs away from the gum line, making errors in alignment easy to detect and correct by the operator manually manipulating the alignment, e.g., by selecting one of the slice views and dragging the associated wireframe projection to rotate and translate the associated alignment matrix.
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