Motion-Based X-Ray Interlock for Tubehead Stability
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Solution Overview
Problem
Relative motion between the tubehead and the image receptor in x-ray machines can degrade the quality of radiographs, as existing systems lack a mechanism to prevent activation during substantial movement, leading to blurred features and poor image resolution.
Innovation Solution
A motion-based interlock system that measures the velocity and acceleration of the tubehead and compares it against acceptable thresholds, delaying exposure until the motion subsides to ensure the image receptor is not exposed while the tubehead is moving, thereby improving radiograph quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the x-ray source is activated during tubehead motion, then productivity is improved by allowing continuous operation, but manufacturing precision deteriorates due to blurred radiograph features
Solution Approach 1:
The system employs motion sensors to continuously monitor tubehead velocity and acceleration, feeding this information back to the control system. The control system uses this feedback to determine whether the tubehead is stable enough for exposure, dynamically enabling or disabling the x-ray source based on real-time motion conditions. This feedback mechanism resolves the contradiction by allowing continuous operational monitoring while ensuring image quality through motion-based activation control.
Solution Approach 2:
The system performs preliminary motion assessment by measuring tubehead velocity and acceleration before allowing x-ray activation. The control system evaluates motion parameters in advance and only permits exposure when stability criteria are met. This preliminary action prevents blurred images by ensuring the tubehead is stable before activation, while maintaining productivity by allowing quick resumption of operation once stability is achieved.
2Manufacturing precision
If motion monitoring and interlock control are added to prevent activation during movement, then manufacturing precision is improved by ensuring stable exposure, but device complexity increases due to additional sensors and control logic
Solution Approach 1:
The control system serves multiple functions: it monitors motion parameters, evaluates stability criteria, controls x-ray source activation, and provides operator feedback through indicators. By consolidating these functions into a single multi-functional control unit, the system improves image quality through motion monitoring while minimizing the increase in device complexity through functional integration rather than adding separate dedicated components for each function.
Solution Approach 2:
The system uses motion parameters (velocity and acceleration thresholds) as changeable criteria to determine exposure readiness. These parameter thresholds can be adjusted based on specific clinical requirements or tubehead characteristics. This approach allows the system to maintain manufacturing precision through adaptive motion control while keeping device complexity manageable by using simple threshold-based logic rather than complex algorithms.
3Manufacturing precision
If the system delays exposure until motion subsides, then manufacturing precision is improved by ensuring tubehead stability, but loss of time increases due to waiting for motion to cease
Solution Approach 1:
The control system continuously and periodically monitors tubehead motion parameters at regular intervals, even when the tubehead appears stable. This periodic monitoring allows the system to detect any new motion quickly and respond immediately, ensuring image quality while minimizing delay. The system can resume or initiate exposure as soon as periodic measurements confirm stability, reducing unnecessary waiting time while maintaining manufacturing precision.
Solution Approach 2:
When the tubehead is determined to be stable based on motion parameter thresholds, the system quickly transitions to allowing exposure without prolonged delays. The interlock control rapidly switches from a restrictive state to an permissive state once stability is confirmed, enabling the exposure process to proceed immediately. This rushing through the transition minimizes time loss while ensuring that the necessary stability condition is met for manufacturing precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively prevents activation during unacceptable motion, ensuring that radiographs are taken when the tubehead is stable, resulting in improved image quality by minimizing the impact of relative movement between the x-ray source and the image receptor.
Implementation Method 1
The processor is configured to obtain one or more motion measurements from one or more motion sensors
Implementation Method 2
The tubehead 20 typically comprises a heavy, e.g. lead, metal housing 22 that encloses the x-ray source, such as a hot cathode, i.e. Coolidge, x-ray tube
Implementation Method 3
The x-rays emitted by the x-ray tube emerge from the metal housing 22 through a lead collimator that partially collimates the x-ray beam
Implementation Method 4
A tubehead seal, such as comprising a thin aluminum sheet, spans the lead collimator, to filter the long wavelength, low energy, i.e. soft, x-rays emitted by the x-ray tube and 'harden' the x-ray beam 32
Data Source
AI summary
A motion-based interlock apparatus, system, and method prevent an x-ray source in an x-ray machine from activating if the current relative motion between the x-ray source and an image receptor would compromise the quality of the resulting plain radiograph. The system activates the interlock based on either or both of the velocity and acceleration of the tubehead, as measured by instrumentation corresponding to any of the tubehead, the extension arm, or off board the x-ray machine. The system may preferably compare the measured motion against one or more acceptable motion thresholds. If the measured motion exceeds one or more of the acceptable motion thresholds, exposure may preferably be delayed until the motion of the tubehead subsides. By ensuring that the image is not exposed while the tubehead is moving substantially, the quality of the resultant radiograph is improved.