Motion Controller for Mobile X-ray C-arm Centering
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Solution Overview
Problem
Mobile C-arm X-ray devices face challenges in maintaining the subject in the center of the image during mechanical zoom, as the central axis moves outward when the C-arm is angled, leading to subject drift or exclusion from the image.
Innovation Solution
A motion controller is used to maintain the central axis fixed in space by controlling the C-arm's movement, either through the lifting column or wheel-driven equipment cart, ensuring the subject remains centered during mechanical zoom by compensating for positional changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the C-arm is positioned at an angle (orbital/angulation angle nonzero) during mechanical zoom, then the image field of view is magnified or reduced, but the subject position in the image shifts and the subject wanders outside the image
Solution Approach 1:
The motion controller continuously monitors the C-arm position (orbital and angulation angles) and the lifting column position, and automatically adjusts the C-arm position in real-time to compensate for subject drift. This closed-loop feedback control ensures the subject remains centered in the image field of view throughout the mechanical zoom process, eliminating the need for manual corrective adjustments.
Solution Approach 2:
The patent replaces manual mechanical adjustment with an automated motion control system that uses motorized actuators and electronic control algorithms. The motion controller substitutes human operators by automatically calculating and executing the precise C-arm position corrections needed to maintain subject centering during mechanical zoom operations.
2Manufacturing precision
If manual correction of C-arm position is performed during mechanical zoom, then subject centering is restored, but operation complexity increases and time is lost
Solution Approach 1:
The motion control system performs self-correction by automatically detecting C-arm position deviations and executing compensatory movements without operator intervention. The system serves itself by autonomously maintaining subject centering throughout the mechanical zoom process, eliminating the need for manual position correction and simplifying the overall operation.
3Manufacturing precision
If manual correction of C-arm position is performed during mechanical zoom, then subject centering is restored, but processing time increases
Solution Approach 1:
The motion controller operates continuously throughout the mechanical zoom process, constantly making微小 adjustments to the C-arm position to maintain subject centering. This continuous automated correction eliminates the discontinuous interruptions caused by manual adjustments, allowing the zoom operation to proceed without time loss for position correction.
Data Source
AI summary
The disclosure relates to a mobile X-ray device having an equipment cart that is movable on wheels and has a lifting device on which a support assembly is arranged. A C-arm is mounted to the support assembly so as to be displaceable along the circumference of the support assembly, wherein the C-arm has an X-ray source and an X-ray receiver arranged opposite the X-ray source. In order to simplify the handling of a mechanical zoom on mobile X-ray devices, a motion controller is provided by which, in any given pose of the C-arm, a movement of the C-arm is controlled in such a way that the central axis extending between X-ray source and X-ray receiver is fixed in space.