X-ray Diagnostic Device Precession Control for Vibration Reduction
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Solution Overview
Problem
Previous X-ray diagnostic devices experience vibrations during the transition to steady-state motion, leading to shaky images and potential safety hazards due to uncontrolled motion before reaching a steady-state orbit, with no consideration for precession motion initialization and fluoroscopic confirmation of image positioning.
Innovation Solution
The X-ray diagnostic device employs drive control mechanisms to manage the angular velocities of the C-arm and holding means using specific velocity profiles f(t) and g(t) to ensure smooth acceleration, maintaining the system within the steady-state orbit, minimizing vibrations, and allowing for safe and quick precession initiation with fluoroscopic confirmation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If rapid acceleration is applied to reach steady-state motion quickly, then the time to reach steady-state is reduced, but vibrations are generated causing shaky images and discomfort
Solution Approach 1:
The patent applies parameter changes by varying the angular velocity profiles of the C-arm and holding means during the acceleration phase. Instead of constant rapid acceleration, the system uses time-dependent velocity functions that smoothly transition from rest to steady-state, changing the motion parameters to avoid vibrations while minimizing time loss.
Solution Approach 2:
The patent employs periodic action through the precession motion itself, where the C-arm and holding means rotate with specific angular velocities that create a periodic motion pattern. This periodic motion allows the system to reach steady-state in a controlled manner, using the natural rhythm of the precession to smooth out transitions and reduce vibrations.
2Ease of operation
If the motion extends outside the steady-state circumferential orbit, then the precession can be initiated, but dangerous contact with external apparatuses or the subject may occur
Solution Approach 1:
The patent applies preliminary action by first positioning the C-arm and holding means within the steady-state orbit before initiating the precession motion. The system performs preliminary alignment and positioning operations to ensure that the X-ray components remain within safe boundaries throughout the acceleration phase, preventing contact with external apparatuses before the main precession operation begins.
3Stability of the object's composition
If the angular velocity of C-arm and holding means is never zero in steady-state, then the precession motion is maintained, but the system cannot be instantaneously accelerated and vibrations occur during run-to-steady-state
Solution Approach 1:
The patent applies dynamics by making the angular velocity profiles adaptive and time-dependent rather than fixed. The system dynamically adjusts the velocity of the C-arm and holding means during the transition phase, allowing instantaneous acceleration to be avoided while maintaining the ability to reach steady-state quickly. The dynamic velocity control enables smooth transitions that prevent vibrations.
Data Source
AI summary
In a precessional operation where an X-ray irradiation means and a two-dimensional radiation detector are moving on a circular or elliptic orbit respectively by rotating either one of holding means, that is a C arm or a holding means at angular rate of a·sin(t) under a steady state condition and by rotating the other holding means at angular rate of b·cos(t), the operation is carried out at angular rate (f(t), g(t)) to ensure that the maximum acceleration is smaller than the steady state acceleration during a running-up period until steady is reached.