Mandibular Canal Reprojection Panoramas for Automated CBCT Alignment
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Solution Overview
Problem
Existing methods for assessing the mandibular canal in dental CBCT images are inefficient due to its curved and oblique course, leading to suboptimal display and increased navigation effort, particularly in multiplanar reformation views.
Innovation Solution
A method for automatically generating a reprojection panoramic view (RPA) aligned with the mandibular canal, involving localization, definition of a guide curve, and extrusion of a projection area to optimize the view, using machine learning and image processing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard multiplanar reformation (MPR) views are used to assess the mandibular canal, then the viewing method is simple and standard, but the curved and oblique course of the mandibular canal leads to suboptimal display and increased navigation effort
Solution Approach 1:
The patent applies curvature by creating a reprojection panoramic view that follows the curved and oblique course of the mandibular canal. Instead of using straight orthogonal slices, the solution generates a curved reformation view that adapts to the natural anatomical curvature of the canal, allowing the entire canal to be displayed in a single optimized view without requiring manual navigation through multiple planes.
2Measurement precision
If tilted MPR views or custom sections are used to align with the mandibular canal, then the display quality improves, but manual setting is time-consuming and requires practice
Solution Approach 1:
The patent implements self-service by enabling the system to automatically generate the optimized reprojection panoramic view aligned with the mandibular canal. The computer-assisted method performs automatic localization and alignment without requiring manual intervention, eliminating the time-consuming manual adjustment process while maintaining high display quality.
Solution Approach 2:
The patent applies parameter changes by transforming the viewing parameters from standard orthogonal slices to a customized reprojection panoramic view. The system automatically adjusts the reformation parameters to align with the mandibular canal's specific geometry, achieving optimal display quality through automated parameter optimization rather than manual setting.
3Area of stationary object
If a planar section is placed tangentially to the mandibular canal, then a large part of the canal is imaged, but the curvature causes the canal to run out of the slice at the edges and be poorly displayed
Solution Approach 1:
The patent resolves this contradiction by replacing the flat planar section with a curved reprojection panoramic view that follows the mandibular canal's trajectory. This curved reformation maintains tangential alignment throughout the entire canal course, ensuring that the canal remains centrally displayed from one end to the other without running out of the slice at the edges.
Solution Approach 2:
The patent applies dimensionality change by transitioning from a two-dimensional planar section to a three-dimensional reprojection panoramic view. This approach allows the visualization to wrap around the curved path of the mandibular canal, maintaining optimal alignment and coverage throughout the entire canal length rather than being constrained to a single flat plane.
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
The present invention relates to a method for automatically generating a reprojection panoramic view (RPA) (1) from a patient's dental CBCT volume, aligned with the course of the mandibular canal (2), comprising the following steps: (S1) localization of the mandibular canal (2); (S2) automatic definition of a projection area (3) of the RPA (1), comprising the following substeps: (S2.1) automatic placement of a guide curve (4) in a plane perpendicular to the patient's longitudinal axis (5) based on the localized mandibular canal (2); (S2.2) automatic definition of a variable or constant thickness profile along the guide curve (4); (S2.3) extrusion of the area defined by the guide curve (4) and thickness profile along the patient's longitudinal axis (5); and (S3) creation of the RPA (1) by reprojecting the CBCT volume in the defined projection area (3).