3D DSA Image Reconstruction Using Single-Rotation Mask Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing 3D DSA image reconstruction techniques suffer from image artifacts due to contrast agent presence, leading to degraded image quality and inefficiencies in procedural workflow, particularly in cone beam CT angiography.
Innovation Solution
Reconstructing cone beam projection data into a 3D mask image before and during contrast agent presence, followed by temporal sequence reconstruction using a neural network to reduce artifacts and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate revolutions are used for mask and DSA image acquisition, then image quality may be improved, but procedural workflow is disrupted and time is lost
Solution Approach 1:
The patent combines mask image acquisition and DSA image acquisition into a single continuous rotation of the C-arm, eliminating the need for separate revolutions. Projection data is acquired continuously while the contrast agent flows through the region of interest, with mask data and DSA data interleaved within the same rotational sweep, thereby maintaining image quality while eliminating procedural disruption and time loss.
2Adaptability or versatility
If projection data is acquired from multiple orientations, then 3D visualization capability is improved, but image artifacts from contrast agent in mask image increase
Solution Approach 1:
The patent performs mask image reconstruction first, using projection data acquired from multiple orientations during the single C-arm rotation. By reconstructing the mask image before generating the DSA images, the system establishes a clean reference that accounts for the anatomical structure without contrast agent, thereby enabling subsequent artifact reduction in the DSA images while maintaining the benefits of multi-orientation 3D visualization.
3Loss of information
If 2D X-ray images are acquired from multiple orientations, then comprehensive anatomical information is obtained, but X-ray dose and contrast agent dose increase
Solution Approach 1:
The patent acquires projection data from a limited angular range (approximately 180 degrees plus fan angle) rather than a complete 360-degree rotation, which is sufficient for CT reconstruction. This partial action approach provides comprehensive enough anatomical information for 3D DSA while reducing the total X-ray exposure and contrast agent volume compared to acquiring images from all possible orientations.
4Adaptability or versatility
If re-orientation of projection X-ray imaging system is performed, then desired views are achieved, but time is consumed and mechanical constraints limit achievable views
Solution Approach 1:
The patent transforms the static, step-by-step re-orientation approach into a dynamic continuous rotation. The C-arm rotates continuously through the required angular range while acquiring projection data at multiple orientations, enabling comprehensive 3D visualization without the time loss and mechanical constraint limitations of stopping and re-positioning the imaging system between views.
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
Improves 3D DSA image quality by reducing artifacts and allowing detailed visualization of complex anatomy and hemodynamic flow, while minimizing procedural disruption.
Implementation Method 1
receive cone beam projection data acquired during a portion of a revolution of a source-detector arrangement of a cone beam X-ray imaging system around an object
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A system (100) for reconstructing digital subtraction angiography, DSA, images (110) representing a region of interest (120) in an object (130), is provided. The system includes one or more processors (140) configured to: receive (S110) cone beam projection data (150) acquired during a portion of a revolution of a source-detector arrangement (160s, 160d) of a cone beam X-ray imaging system (170) around the object (130); reconstruct (S120) the cone beam projection data (150) acquired from one or more orientations within a first angular range (Dq1), into a 3D mask image (170) representing the region of interest (120); and reconstruct (S130) the cone beam projection data (150) acquired from one or more orientations within a second angular range (Dq2), into a temporal sequence of 3D DSA images (110) representing the region of interest (120), based on the reconstructed 3D mask image (170).