3D Cardiac Motion Estimation from Single C-arm Scan
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Solution Overview
Problem
Current C-arm angiography techniques require multiple scans to estimate 3D cardiac motion, leading to patient discomfort, increased radiation exposure, and reconstruction artifacts due to limited projection images per cardiac phase, especially when only a single sweep is used.
Innovation Solution
A method that reconstructs 3D cardiac motion from a single C-arm scan by segmenting a static mesh, projecting it onto 2D images, determining cardiac phases, and generating deformed meshes based on 2D contours, allowing for motion compensation without the need for multiple sweeps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sweeps of C-arm system are performed to generate enough projections at the same cardiac phase, then the accuracy of cardiac phase-specific 3D reconstruction is improved, but the total scanning time increases to about 30 seconds requiring patient breath holding
Solution Approach 1:
The patent applies preliminary action by performing motion estimation and compensation during the single sweep acquisition process. Instead of waiting for multiple sweeps to accumulate sufficient projections, the system estimates cardiac motion in real-time and compensates for it immediately, allowing accurate reconstruction from a single 5-second sweep without requiring patient breath holding for extended periods
Solution Approach 2:
The patent replaces the mechanical approach of physically acquiring multiple sweeps with a computational approach. Using optical flow algorithms and image registration techniques, the system virtually generates sufficient cardiac phase-specific projections from a single sweep by estimating and compensating for cardiac motion through software-based motion correction rather than through repeated physical scanning
2Measurement precision
If multiple sweeps are performed to obtain sufficient projections per cardiac phase, then reconstruction quality is improved, but radiation exposure and contrast agent consumption increase
Solution Approach 1:
The patent applies partial action by using a single sweep (less than the traditional multiple sweeps) combined with motion compensation techniques. The system acquires fewer projections than traditionally required but compensates by estimating cardiac motion and reassigning projections to appropriate cardiac phases through image registration and optical flow methods, achieving sufficient reconstruction quality with reduced radiation and contrast agent exposure
3Loss of time
If only a single sweep is applied to reduce scanning time and radiation exposure, then patient comfort and safety are improved, but there are limited projection images available for each cardiac phase resulting in reconstruction artifacts
Solution Approach 1:
The patent replaces the mechanical solution of acquiring multiple sweeps with a computational motion compensation system. Using optical flow algorithms, the system estimates cardiac motion from the single sweep and uses image registration to reassign projections to appropriate cardiac phases, virtually generating sufficient projections per phase without requiring multiple physical sweeps
Solution Approach 2:
The patent introduces motion estimation and compensation algorithms as an intermediary between the limited single-sweep data and the desired high-quality reconstruction. The optical flow and image registration techniques act as mediators that extract and utilize motion information to redistribute the limited projections across cardiac phases, enabling accurate reconstruction despite the limited number of acquired projections
Data Source
AI summary
A method and system for estimating 3D cardiac motion from a single C-arm angiography scan is disclosed. An initial 3D volume is reconstructed from a plurality of 2D projection images acquired in a single C-arm scan. A static mesh is extracted by segmenting an object in the initial 3D volume. The static mesh is projected to each of the 2D projection images. A cardiac phase is determined for each of the 2D projection images. A deformed mesh is generated for each of a plurality of cardiac phases based on a 2D contour of the object and the projected mesh in each of the 2D projection images of that cardiac phase.