2D3D Overlay CPR for Aneurysm Stent Placement
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Solution Overview
Problem
During fluoroscopy-controlled interventions for abdominal aortic aneurysms, existing methods struggle to provide a standardized view of the aorta and guide instruments in 2D images, as the curvature of the aorta and guide wires can obscure important vessel branches, making precise stent placement challenging without continuous contrast medium injection.
Innovation Solution
The method adapts the 2D3D overlay to display a curved planar reconstruction, warping the 2D fluoroscopy image around the curved center line of the aorta or guide instrument to straighten it, allowing for real-time adjustments with known registration to the C-arm and projection geometry, mimicking diagnostic CT visualizations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 2D3D overlay is used to guide stent placement, then real-time visualization is improved, but the curvature of the aorta obscures vessel branches and reduces visualization clarity
Solution Approach 1:
The patent applies curved planar reconstruction (CPR) technology that warps the 2D fluoroscopy image around the curved center line of the aorta to straighten it. This transforms the curved aortic structure into a standardized straight representation, making vessel branches visible and improving visualization clarity during stent placement while maintaining real-time overlay capabilities.
2Measurement precision
If continuous contrast medium injection is used to control stent positioning, then positioning accuracy is improved, but substance loss and procedural complexity increase
Solution Approach 1:
The patent performs preliminary action by pre-processing the 3D volume image to extract the aortic center line and curvature information before the intervention. This pre-computed geometric data is then used to automatically warp and straighten the aorta in the 2D3D overlay, eliminating the need for continuous contrast medium injection during the procedure while maintaining positioning accuracy.
Solution Approach 2:
The system uses self-service by automatically tracking the aortic center line and guide wire position through the 2D fluoroscopy images during the procedure. The extracted geometric information is fed back into the system to dynamically adjust the CPR warping, allowing the system to self-correct and maintain accurate visualization without external contrast medium administration.
3Stability of the object's composition
If the aorta is straightened for standardized view, then visualization consistency is improved, but the natural curvature of the aorta is lost
Solution Approach 1:
The patent applies curved planar reconstruction (CPR) technology that warps the 2D fluoroscopy image around the curved center line of the aorta to straighten it. This transforms the curved aortic structure into a standardized straight representation, making vessel branches visible and improving visualization clarity during stent placement while maintaining real-time overlay capabilities.
Data Source
AI summary
In a method for fluoroscopy controlled insertion of a stent into a curved aorta for aneurysm repair, a 3D volume image is obtained of a patient's aorta at the aneurysm. By knowing a registration of the 3D volume image to a C-arm of an angiographic system and projection geometry of the angiography system, the 3D volume images are projected to a 2D fluoroscopy image of the angiography system. For the 2D3D overlay, the 3D volume image is displayed as a curved planar reconstruction in which the 2D fluoroscopy image and the 3D volume image are warped around a curved center line of the curved aorta or around a curved guide instrument center line to correct for the curvature of the aorta so that the previously curved aorta center line or curved center line of the guide instrument turns into a straight line to visualize insertion of the stent.