Teniae Coli Coordinate System for Virtual Colonoscopy Registration
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Solution Overview
Problem
Existing virtual colonoscopy methods require invasive procedures and lack precise registration of polyps between supine and prone scans due to the conventional centerline approach, which is less precise and time-consuming.
Innovation Solution
A teniae coli derived coordinate system is used to guide virtual colonoscopic navigation and register lesions in multiple scanned data sets by creating a three-dimensional construction of the colon surface, forming an indexed surface, and synchronizing virtual cameras between scans using the teniae coli defined cylindrical coordinate system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional centerline approach is used for navigation, then longitudinal distance can be generated, but measurement precision and orientation information are insufficient for accurate polyp registration
Solution Approach 1:
The patent transitions from a one-dimensional centerline approach to a two-dimensional cylindrical coordinate system by incorporating the teniae coli as a circumferential reference. This adds the angular dimension (azimuthal angle) to the existing longitudinal dimension, enabling precise localization in both axial and circumferential directions simultaneously, thereby resolving the precision limitation without excessive complexity
Solution Approach 2:
The teniae coli serves as an intermediary anatomical landmark that bridges the gap between the centerline position and the actual polyp location. By using this naturally occurring structural feature as a reference marker, the system achieves accurate polyp registration without requiring complex artificial markers or invasive procedures
2Loss of information
If centerline-based navigation is used, then longitudinal distance is obtained, but orientation information is lacking for synchronizing virtual cameras
Solution Approach 1:
The cylindrical coordinate system introduces the azimuthal angle dimension that provides orientation information around the colon circumference. This allows virtual cameras in supine and prone positions to be synchronized not only by longitudinal position but also by circumferential orientation, eliminating the information loss without complicating camera control
3Reliability
If supine and prone scans are performed to increase polyp detection sensitivity, then detection reliability improves, but time consumption increases due to manual registration
Solution Approach 1:
The teniae coli-based coordinate system enables automatic self-registration of supine and prone scans by providing inherent anatomical landmarks that can be automatically detected and matched. This eliminates the need for time-consuming manual registration while maintaining the reliability benefits of dual-position scanning
Solution Approach 2:
The teniae coli acts as a natural intermediary reference that facilitates rapid automatic alignment between supine and prone datasets. This mediator structure allows computational algorithms to quickly match corresponding anatomical locations without requiring manual intervention, thus reducing time loss while preserving detection reliability
Data Source
AI summary
A computer-assisted method for detecting surface features in a virtual colonoscopy. The method includes providing a three-dimensional construction of a computed tomography colonography surface; creating a path along the teniae coli from the proximal ascending colon to the distal descending colon on the colonography surface; forming an indexed computed tomography colonography surface using the created path; and registering the supine and prone scans of the computed tomography colonography surface using the indexed computed tomography colonography surface. The method also includes navigating the internal surface of the computed tomography colonography using the indexed computed tomography colonography surface.