X-ray CT Orbit Synchronization Trigger Position Optimization
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Solution Overview
Problem
Conventional X-ray CT apparatuses experience significant time loss due to the need to wait for the X-ray tube to return to the origin position after completing a going-way scan before starting a return-way scan, resulting in inefficient orbit synchronization control.
Innovation Solution
The X-ray CT apparatus incorporates a gantry-couch control unit that determines optimized orbit synchronization trigger positions based on calculated waiting times to minimize the sum of differential angles between scan completion and start positions, allowing for synchronized radiation control without waiting for the X-ray tube to return to the origin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the X-ray tube waits to return to the origin position (rotational angle 0°) before starting radiation in a return-way scan, then the orbit synchronization control can be maintained, but the returning time between scans increases significantly
Solution Approach 1:
The system performs preliminary calculation of the optimal trigger position angle before the scan sequence. Based on the rotational speed and preparation time, the control unit determines in advance the angle at which radiation should be triggered during the return-way scan, eliminating the need to wait for the X-ray tube to return to the origin position.
Solution Approach 2:
The invention changes the trigger position parameter from a fixed value (0° origin position) to a variable value calculated based on scanning conditions. The trigger position angle is dynamically determined using the formula: trigger position angle = (preparation time × rotational speed) + offset angle, allowing optimization of the return time while maintaining synchronization.
2Productivity
If the X-ray tube starts radiation immediately after preparation without waiting for origin position, then the returning time is reduced, but the orbit synchronization control becomes complex
Solution Approach 1:
The control unit continuously monitors the rotational position of the X-ray tube and uses feedback to calculate the optimal trigger moment. Based on the actual rotational speed and the predetermined preparation time, the system adjusts the trigger position angle to maintain precise synchronization between the X-ray radiation and the scan sequence.
Solution Approach 2:
The system transitions from a static trigger position (fixed at 0°) to a dynamic trigger position that adapts to varying scanning conditions. The trigger position angle is calculated in real-time based on the rotational speed and preparation time, allowing the system to optimize performance while managing complexity through algorithmic control.
3Ease of operation
If the trigger position is fixed at the origin (rotational angle 0°), then the control is simple, but the temporal resolution of images deteriorates due to large waiting times
Solution Approach 1:
The system performs preliminary calculation of the optimal trigger position angle before the scan sequence. Based on the rotational speed and preparation time, the control unit determines in advance the angle at which radiation should be triggered during the return-way scan, eliminating the need to wait for the X-ray tube to return to the origin position.
Data Source
AI summary
In an X-ray Computed Tomography apparatus according to an embodiment, an angle determining unit determines an angle indicating a position of an X-ray radiation unit in a circular orbit at a moment to start radiation after a return of reciprocation, based on a time from a moment of completion of radiation in a movement to a certain direction until a moment to start radiation in a movement after the return, which is a time calculated from scanning conditions. A radiation control unit controls radiation by the X-ray radiation unit so as to start in accordance with the angle determined by the angle determining unit.