Aligning CT and X-ray Data for Standing Spine 3D Models
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Solution Overview
Problem
Current diagnostic methods for spinal deformity, such as X-rays and CT scans, have limitations in capturing the spine's curvature accurately, especially since CT scans are taken while patients are lying down, which may not adequately represent the deformity's appearance in a standing position crucial for surgical planning.
Innovation Solution
An image alignment system that combines X-ray and CT scan images to create a patient-specific 3D model by converting vertebrae into segmented polygons and aligning them using landmarks, allowing for the generation of a 'standing' CT scan representation for enhanced surgical planning and diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a CT scan is used to capture detailed images of bones and soft tissue, then the detail and clarity of tissue imaging is improved, but the patient position requirement (lying down) causes the spine curvature representation to worsen compared to standing position
Solution Approach 1:
The patent uses an alignment computer as an intermediary to register and align the CT scan images with the X-ray images. The alignment computer processes the CT scan data and transforms it into a standing position representation by aligning anatomical landmarks between the two imaging modalities, thereby mediating between the detailed soft tissue information from CT and the accurate spine curvature from standing X-ray
Solution Approach 2:
The patent merges the strengths of both imaging modalities by combining the detailed soft tissue and bone information from CT scans with the accurate standing position spine curvature information from X-rays. The alignment computer integrates these two data sources to create a comprehensive 3D model that preserves both tissue detail and spine curvature accuracy
2Loss of information
If an X-ray is used to capture images of the spine in standing position, then the spine curvature representation is improved, but the ability to capture soft tissue details deteriorates compared to CT scan
Solution Approach 1:
The patent combines the standing position X-ray images that accurately represent spine curvature with CT scan images that provide detailed soft tissue information. The alignment computer merges these complementary data sources, allowing the system to preserve both the accurate spine curvature from X-ray and the detailed soft tissue visualization from CT scan in a unified 3D model
3Device complexity
If separate X-ray and CT scan images are examined separately, then the simplicity of individual imaging modalities is maintained, but the comprehensive diagnostic information deteriorates
Solution Approach 1:
The patent merges separate X-ray and CT scan examinations into a unified aligned 3D model. The alignment computer automatically processes and combines the data from both imaging modalities, maintaining the simplicity of separate imaging procedures while eliminating the need for manual comparison and providing comprehensive diagnostic information in an integrated visualization
Solution Approach 2:
The alignment computer creates a digital copy and transformation of the CT scan data, registering it to match the geometry and orientation of the standing X-ray images. This copying and transformation process allows the system to preserve all diagnostic information from both modalities without requiring the surgeon to physically manipulate or mentally integrate separate images
Data Source
AI summary
An image alignment system and method which generates X-ray aligned patient specific 3D models. In particular, the image alignment system combines a CT scan and an X-ray into a single patient specific 3D model that, leveraging the benefits of both types of images and providing a surgeon with a single model for diagnosing a spinal deformity, for engaging and education a patient about the spinal deformity, and for preparing for spinal surgery. The system allows the CT scan to be done with the patient in the prone condition while the X-ray can be done with the patient in a vertical, e.g., standing, position to capture impacts on the spine from that vertical position.