Volume Rendering with Object-Dependent Focusing Parameters
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Solution Overview
Problem
Current methods for visualizing medical image data sets, such as those from CT or MR imaging, overwhelm users with excessive information, making it difficult to handle and identify relevant details within three-dimensional arrangements of objects like organs and vessels.
Innovation Solution
A method that uses volume rendering techniques, specifically path tracing, with different focusing parameters for primary and secondary rays to present the first object sharply and the second object less sharply, allowing for focused visualization of relevant objects while blurring less relevant information, using an aperture size of zero for primary rays and a non-zero value for secondary rays based on distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a common focusing parameter is used for all rays in volume rendering, then the rendering process is simple and fast, but all objects are displayed with the same sharpness level making it difficult for users to identify relevant information
Solution Approach 1:
The patent applies local quality by assigning different focusing parameters to different regions of the image data set. Specifically, a first focusing parameter is applied to a first region containing relevant objects while a second focusing parameter is applied to a second region containing less relevant objects. This creates a depth of field effect where relevant objects appear sharp while background objects appear blurred, allowing users to easily identify important information without being overwhelmed by excessive detail throughout the entire data set.
2Ease of operation
If different focusing parameters are used for different regions, then user orientation and identification of relevant objects is improved, but the volume rendering method becomes more complex
Solution Approach 1:
The patent implements preliminary action by pre-defining regions of interest within the image data set before performing the volume rendering operation. The system identifies which regions contain relevant objects and assigns appropriate focusing parameters to these regions in advance. This preparation step allows the rendering process to efficiently apply the correct focusing parameters without requiring complex real-time calculations during the actual rendering, thus improving user orientation while keeping the rendering method manageable.
Data Source
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AI summary
Method for visualizing an image data set, in particular a medical image data set, wherein the visualized data set displays a three-dimensional arrangement having at least a first object and a second object, comprising the steps: - providing a three-dimensional image data set including first voxels being assigned to the first object and second voxels being assigned to the second object; - identifying first voxels (11) of the-three dimensional image data; - determining a set of parameters for a volume rendering method, wherein the set of parameters includes a subset of parameters and a focusing parameter; - identifying primary rays (12) that impact on the first object and secondary rays that miss the first object; and - performing the volume rendering method (14), in particular a path tracing method, using the subset of parameters for visualizing the first object and the second object, wherein the focusing parameter used for the primary rays in the volume rendering method is different from the focusing parameter used for the secondary rays in the volume rendering method.