Simulated Light Positioning in 3D Rendering to Reduce Self-Shadowing
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Solution Overview
Problem
Existing medical imaging techniques using directional light sources outside the 3D data set cause self-shadowing and obscure anatomical details, making it difficult to illuminate structures of interest and navigate within the volume.
Innovation Solution
Implementing a simulated light source positioned within the 3D data set, which can be multidirectional, allowing users to place it anywhere within the volume, including the region of interest, to enhance depth perception and reduce shadowing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a directional light source is positioned outside the 3D data set, then the rendering process is simplified and computation is reduced, but self-shadowing occurs and anatomical details are obscured
Solution Approach 1:
The patent inverts the conventional approach by positioning the light source inside the 3D data set rather than outside. This reversal eliminates self-shadowing because light originates from within the volume, illuminating structures from the interior and allowing anatomical details to be visible without being blocked by overlying tissues.
2Ease of manufacture
If a directional light source is used from outside the volume, then the lighting model is simpler to implement, but it makes it difficult to illuminate structures of interest and navigate within the volume
Solution Approach 1:
The patent implements a dynamic light source that can be freely positioned and oriented anywhere within the 3D data set by the user. This dynamic positioning capability allows clinicians to navigate within the volume by moving the light source to different locations, illuminating specific structures of interest from optimal angles, thereby enhancing interactive exploration of the anatomical data.
3Loss of energy
If a light source is placed outside the 3D data set, then shadowing effects are reduced in computation, but object self-shadowing occurs and obscures anatomical structures
Solution Approach 1:
The patent converts the harmful effect of self-shadowing into a beneficial feature by allowing the light source to be positioned inside the volume. What would normally be considered a computational simplification (placing light outside) is transformed into a source of anatomical obscuration, while the alternative (placing light inside) that increases computational complexity actually eliminates self-shadowing and reveals anatomical structures.
Data Source
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AI summary
The present disclosure describes an image rendering technique that provides a simulated light source positioned within a three dimensional (3D) data set for rendering two dimensional projection images of the 3D data set. The simulated light source may be positioned anywhere inside or outside the 3D data set, including within a region of interest. The simulated light source may be a multidirectional light source. A user may select a position of the simulated light source via a user interface. A user may select an in-plane position of the simulated light source and an image processor and/or volume renderer may automatically calculate a depth position to maintain a distance between the simulated light source and a surface of a region of interest in the 3D data set.