CT Rotation Axis Determination from X-ray Radiographs
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Solution Overview
Problem
Conventional CT scanning methods require inefficient and time-consuming calibration of the physical axis of rotation for each scan, which lacks precision and does not account for variations between scans, leading to reduced scanning efficiency and accuracy.
Innovation Solution
A computer-implemented method and system that determine the axis of rotation per scan from a plurality of radiographs prior to CT reconstruction, using techniques such as generating representative pixels, determining attenuation coefficients, and applying filters to accurately identify the axis of rotation for each scan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional calibration methods using physical artifacts are used, then the axis of rotation can be determined, but the process is time-consuming and reduces scanning efficiency
Solution Approach 1:
The system performs preliminary processing of the radiograph data to automatically determine the axis of rotation before the actual CT reconstruction. By pre-processing the projection data to identify the rotation axis, the system eliminates the need for time-consuming physical calibration artifacts while maintaining measurement precision.
Solution Approach 2:
The patent replaces the mechanical calibration process (using physical artifacts and manual alignment) with an automated computational method that processes X-ray projection data to mathematically determine the rotation axis. This substitution eliminates physical calibration steps and significantly improves scanning efficiency.
2Device complexity
If a single calibration is used for all scans, then the calibration process is simplified, but it fails to account for variations between scans reducing precision
Solution Approach 1:
The system dynamically determines the axis of rotation for each individual scan based on the specific radiograph data, rather than using a static pre-established calibration. This dynamic approach allows the system to adapt to variations between scans and maintain high measurement precision for each individual measurement.
Solution Approach 2:
The system uses the radiograph data itself to determine the rotation axis, making the calibration process self-sufficient and eliminating the need for external calibration artifacts. Each scan automatically calibrates itself using its own projection data, ensuring accuracy without requiring complex external calibration procedures.
3Measurement precision
If manual calibration procedures are used, then the axis of rotation can be identified, but the process is labor-intensive and time-consuming
Solution Approach 1:
The patent replaces manual calibration procedures with automated computational algorithms that process X-ray projection data to automatically identify the rotation axis. This automation eliminates manual intervention and significantly reduces calibration time while maintaining or improving measurement precision through computational accuracy.
Solution Approach 2:
The system creates a digital representation of the calibration information by processing the radiograph data computationally. Instead of using physical calibration artifacts, the system generates a digital model of the rotation axis parameters directly from the projection data, eliminating manual measurement and reducing time consumption.
Data Source
AI summary
A system and method of processing a CT scan includes receiving a plurality of radiographs and determining an axis of rotation per scan from the plurality of radiographs prior to CT reconstruction.