Ray Casting for Polyp Visualization Navigation
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Solution Overview
Problem
Current medical imaging systems, particularly in 3D visualization, face challenges in efficiently navigating and examining protrusions like colonic polyps, as existing camera control methods are either too tedious or lack sufficient investigation time for interesting areas during virtual navigation.
Innovation Solution
A method and system that cast rays in spherical or ellipsoidal formations from a point within a protrusion to determine the optimal location and direction for viewing, using the ray with the shortest or average distance to the surface, allowing for efficient navigation and examination of detected protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If full manual camera control is used to navigate virtual space, then the operator can explore specific sections of interest, but the process becomes tedious and time-consuming, and important features may be missed
Solution Approach 1:
The system pre-calculates and stores optimal viewing locations and directions for all detected protrusions before the navigation session begins. This preliminary computation enables the autopilot mode to instantly navigate to the best viewing angle for each polyp without requiring real-time manual adjustment, thereby reducing navigation time while maintaining ease of operation.
2Productivity
If autopilot mode with predetermined path is used, then the operator can concentrate on viewing the virtual space, but insufficient time is provided to fully investigate interesting areas
Solution Approach 1:
The system provides feedback by automatically adjusting the camera view to the pre-calculated optimal location and direction for each detected protrusion. This feedback mechanism ensures that the operator always views polyps from the best possible angle, maintaining examination thoroughness while allowing the operator to focus on analysis rather than navigation, thus improving productivity.
3Measurement precision
If manual review of 2D medical images is performed, then precise images of anatomical structures can be obtained, but 3D visualization is required to confirm whether suspicious structures are true abnormalities
Solution Approach 1:
The system transforms 2D CT image data into 3D virtual representations of the colon and detected protrusions. By casting rays from detected polyp locations to determine optimal 3D viewing angles, the system provides genuine three-dimensional visualization that allows operators to assess the true nature of suspicious structures, confirming abnormalities that may not be apparent in 2D slices alone.
Data Source
AI summary
A system and method for determining a location and a direction for viewing a protrusion, comprising: casting a plurality of rays in an outward direction from a point, wherein the point is inside a protrusion; selecting at least one of the plurality of rays for determining a location and a direction for viewing the protrusion; and determining the location and the direction for viewing the protrusion using the selected at least one of the plurality of rays.