X-ray CT Bed Device Independent Top and Frame Acceleration
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Solution Overview
Problem
The X-ray computed tomography apparatus faces limitations in increasing the sliding speed of the top due to structural constraints, requiring rapid acceleration to achieve high-speed imaging, which increases the load on the object being scanned.
Innovation Solution
The apparatus employs a control circuitry system that controls the acceleration and deceleration of the top and upper frame independently, using a start auxiliary operation to accelerate the top to a set speed and a stop auxiliary operation to decelerate it, allowing for high-speed scanning while reducing the load on the object by optimizing the slide distance and speed profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the top is rapidly accelerated to achieve high-speed imaging within structural limitations, then the imaging speed is improved, but the load on the object being scanned increases
Solution Approach 1:
The bed device is divided into two independently controllable components: the top (which directly carries the object) and the upper frame (which supports the top). This segmentation allows the upper frame to be accelerated first, creating a moving reference frame that reduces the relative acceleration experienced by the object on the top.
Solution Approach 2:
The control circuitry performs preliminary acceleration of the upper frame before accelerating the top. By the time the top needs to reach high speed, the upper frame is already moving, so the top's acceleration relative to the external environment is reduced, thereby reducing the load on the object while still achieving high imaging speed.
2Object-affected harmful factors
If the top sliding distance is increased to reduce acceleration requirements, then the load on the object is reduced, but the structural limitation on maximum sliding distance prevents this approach
Solution Approach 1:
The problem is solved by adding a temporal dimension to the acceleration process. Instead of extending the spatial distance for acceleration, the system uses time-based sequencing where the upper frame is accelerated first, then the top is accelerated on top of that motion. This transforms a spatial problem into a temporal coordination problem.
3Speed
If independent control of top and upper frame acceleration is implemented, then high-speed scanning with reduced load is achieved, but the device complexity increases
Solution Approach 1:
The control circuitry dynamically changes acceleration parameters (magnitude, timing, duration) for both the top and upper frame based on the imaging requirements. By adjusting these parameters, the system achieves high-speed scanning with reduced object load without requiring fundamental structural changes, thereby managing complexity through software control rather than hardware complexity.
Data Source
AI summary
One embodiment, control circuitry executes at least one of a start operation and a stop operation. For a start operation, the control circuitry accelerates a top support portion along a forward direction before moving a top when starting to move an object in a scan after positioning the top support portion at a moving start position decided based on a scan condition and accelerates the top to a set speed along the forward direction after a first predetermined time since start of acceleration control on the top support portion. For a stop operation, the control circuitry accelerates the top support portion along the forward direction when decelerating the top and stops the top after a second predetermined time since start of acceleration control on the top support portion.