X-Ray Imaging Centering with Pose Deviation Feedback
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Solution Overview
Problem
Existing X-ray imaging systems with uncoupled emitters and detectors face challenges in precise mechanical alignment, leading to deviations that result in incomplete image coverage, bright edges, and inefficient use of the detector surface, requiring repetitive adjustments to ensure accurate image reconstruction.
Innovation Solution
A method and apparatus for centering an X-ray imaging system with independently controllable emitters and detectors, involving calibration and iterative adjustment to align the X-ray beam center with the detector center, using a centering facility with control and measurement units to determine and correct pose deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the X-ray tube and detector are not mechanically coupled (flexible robotic system), then the system has higher adaptability and flexibility, but the mechanical alignment precision deteriorates due to independent positioning requirements
Solution Approach 1:
The patent replaces mechanical coupling between the X-ray tube and detector with an optical/electronic alignment system. A laser emitter projects a reference beam that defines the central axis, and a camera detects the beam position on the detector to calculate alignment deviations. These deviations are then compensated through software correction of the detector's position and orientation parameters, eliminating the need for precise mechanical coupling while maintaining alignment accuracy.
2Area of stationary object
If the telescopic arms are extended to increase imaging range, then the coverage area increases, but the alignment precision deteriorates due to bending from centrifugal forces
Solution Approach 1:
The patent implements a feedback mechanism where the actual position and orientation of the detector are continuously measured using a camera that detects the laser reference beam. The measured alignment deviations are fed back to the control system, which automatically adjusts the detector's pose parameters to compensate for bending effects. This closed-loop feedback allows the system to maintain alignment precision even when telescopic arms are extended and subject to centrifugal forces.
3Device complexity
If the central beam does not strike the center of the detector, then the system can operate with simpler mechanics, but the image quality deteriorates due to incomplete coverage and bright edges
Solution Approach 1:
The patent replaces complex mechanical alignment mechanisms with an optical reference system. A laser emitter projects a central beam that serves as a reference axis, and a camera detects where this beam strikes on the detector surface. Based on the detected position, the system calculates the required correction to align the beam center with the detector center, and applies software-based pose correction to achieve proper alignment without complex mechanical adjustments.
4Manufacturing precision
If repetitive system adjustments are performed to ensure accurate image reconstruction, then the image quality improves, but the adjustment time increases
Solution Approach 1:
The patent performs preliminary alignment by projecting a laser reference beam and detecting its position on the detector before actual imaging begins. The system calculates the alignment deviations from the detected beam position and pre-compensates the detector's pose parameters. This preliminary action ensures that the central beam is properly aligned with the detector center before image acquisition, eliminating the need for repetitive adjustments during the imaging process and significantly reducing setup time.
Data Source
AI summary
A method for centering an X-ray imaging system with an emitter with a variable pose and an X-ray detector with a variable pose which can be controlled independently of the variable pose of the emitter involves controlling a predetermined pose with the emitter and controlling a pose of the X-ray detector corresponding to the predetermined pose of the emitter. Subsequently, the actual pose of the emitter and the actual pose of the X-ray detector is determined. Furthermore, a first deviation of the actual pose of the emitter from the predetermined pose of the emitter is determined and a second deviation of the actual pose of the X-ray detector from the predetermined pose of the X-ray detector is determined. Finally, a corrected predetermined pose for centering the emitter based on the first deviation and a corrected predetermined pose for centering the X-ray detector based on the second deviation is determined.