Spherical Light Volume Rendering for Real-Time Medical Imaging
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Solution Overview
Problem
Conventional methods for rendering medical images from volumetric data struggle with computational inefficiencies, particularly in achieving real-time global illumination effects, leading to high computational costs and memory consumption, which are unsuitable for interactive and real-time applications.
Innovation Solution
A method involving the construction of a light volume using spherical slices, where light propagation is determined by optical properties of the volumetric data, allowing for gradient-free shading and sampling to achieve global illumination effects in real-time, reducing computational cost and memory requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Monte Carlo path tracing is used to achieve photorealistic global illumination effects, then rendering quality is improved, but computational time increases to minutes per image making real-time rendering unachievable
Solution Approach 1:
The patent segments the light propagation problem into discrete spherical slices arranged in a light volume. Instead of simulating thousands of individual light paths through Monte Carlo integration, the light volume is divided into concentric spherical slices where light propagation is computed slice-by-slice. This segmentation transforms the computationally intensive path tracing problem into a series of simpler, parallelizable operations that can be executed in real-time while maintaining global illumination effects.
2Productivity
If conventional raycasting with local illumination is used, then rendering speed is improved for real-time applications, but photorealistic effects such as light scattering and extinction are not simulated
Solution Approach 1:
The patent introduces a new dimensional approach by organizing light propagation in a spherical light volume with concentric slices rather than using traditional raycasting through volumetric data. This dimensional reorganization allows the system to compute global illumination effects by propagating light through spherical shells, maintaining real-time performance while achieving photorealistic light scattering and extinction effects that conventional local illumination cannot provide.
3Manufacturing precision
If interactive volume lighting computes the entire lighting volume to achieve global illumination effects, then rendering quality is improved, but memory consumption increases
Solution Approach 1:
The patent segments the lighting volume into discrete spherical slices, allowing the system to compute and store only the necessary light propagation data for each slice rather than maintaining the entire lighting volume simultaneously. This segmentation reduces memory consumption by enabling progressive computation and rendering through the spherical slices in sequence, while still achieving complete global illumination effects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables real-time rendering of medical images with improved spatial impression and reduced computational overhead, facilitating less invasive and more efficient interventional procedures by supporting high-resolution global illumination effects.
Implementation Method 1
The light volume includes a series of consecutive spherical slices through which light from the spherical light source propagates
Implementation Method 2
determining a fraction of the light propagating from one spherical slice to a corresponding neighboring spherical slice... The propagating of the light depends on the determined at least one optical property
Implementation Method 3
simulates the complex light scattering and extinction associated with photorealism
Data Source
AI summary
For real-time rendering of medical images from volumetric data obtained from a medical scanner, one or more optical properties of the received volumetric data are determined. A light volume associated to a spherical light source is constructed. The light volume comprises a series of consecutive spherical slices through which light propagates while determining a fraction of the light propagating from one spherical slice to a neighboring spherical slice depending on the optical properties. The constructed light volume is sampling with a gradient-free shading that depends on the determined optical properties. At least one medical image is rendered in relation to the received volumetric data based on the sampled light volume.