Stereoscopic Angiography Rendering for Depth Perception
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Solution Overview
Problem
Current methods for displaying three-dimensional angiography image data sets, such as maximum intensity projection, fail to effectively convey the 3D relationships of blood vessel structures, leading to information loss and cumbersome diagnosis due to overlapping and crossing vessel structures, resulting in prolonged review workflows.
Innovation Solution
The method involves rendering two display images from the angiography data set using viewing directions that form a small angle suitable for stereoscopic perception, allowing each image to be displayed to one eye, which enhances depth perception and simplifies the rendering process, particularly using parallel maximum intensity projections and pre-calculated thin MIPs, reducing computational complexity and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If maximum intensity projection is used to render angiography images, then the rendering process is computationally simple, but the 3D relationship information is lost and vessel structures overlap
Solution Approach 1:
The patent transitions from 2D projection views to 3D volumetric rendering with depth encoding. By introducing depth information through color mapping and multi-planar reconstruction, the system preserves 3D spatial relationships while maintaining computational efficiency through optimized rendering algorithms.
Solution Approach 2:
The patent divides the volumetric data into multiple slices or planes that can be independently rendered and then composite together. This segmentation allows the system to process complex 3D structures in manageable portions while preserving spatial relationships through depth-coded visualization.
2Device complexity
If conventional 2D display methods are used, then the display device is simple, but the differentiation of fine overlapping vessel structures is impaired
Solution Approach 1:
The patent employs color-coded depth mapping where different colors represent different depth planes or distance from the viewer. This allows fine vessel structures at different depths to be visually differentiated while using standard display devices, enhancing diagnostic capability without requiring specialized hardware.
Solution Approach 2:
By encoding depth information in the visual display through color and transparency variations, the patent adds a perceptual dimension to the 2D display. This allows the human visual system to distinguish overlapping structures based on their encoded depth properties.
3Loss of information
If detailed volumetric rendering is performed to preserve 3D relationships, then information loss is reduced, but computational complexity increases
Solution Approach 1:
The patent performs preliminary processing of the volumetric data by pre-calculating depth information, generating depth buffers, and organizing data by depth planes before final rendering. This preliminary action reduces the computational burden during real-time or near-real-time visualization while preserving 3D spatial relationships.
Solution Approach 2:
The patent transforms the rendering approach by pre-computing depth-coded representations of the volumetric data. This allows complex 3D relationships to be preserved in a computationally efficient format that can be rapidly displayed using standard rendering pipelines.
4Measurement precision
If multiple orthogonal projection images are displayed to facilitate depth interpretation, then depth perception is improved, but the number of display images increases
Solution Approach 1:
The patent merges multiple projection views and depth information into a single integrated visualization. By combining multi-planar reconstruction with depth-coded rendering, the system provides comprehensive depth interpretation in one display rather than requiring multiple separate images.
Solution Approach 2:
The patent encodes depth information directly in the visual properties of a single 2D display, eliminating the need for multiple orthogonal views. Through color-coded depth mapping and transparency variations, the system provides intuitive depth perception in a unified visualization.
Data Source
AI summary
A method for post processing and displaying a three-dimensional angiography image data set of a blood vessel tree of a patient, wherein two-dimensional display images are rendered from the angiography image data set and displayed, wherein two display images are rendered from the angiography image data set using viewing directions forming an angle suited for stereoscopic perception of the display images and both display images are simultaneously displayed on a display screen in a display presentation that causes each display image to be viewed by one eye of a person viewing the display screen.