MRI Bed Positioning Mechanism with Segmented Docking
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Solution Overview
Problem
Conventional MRI bed positioning mechanisms are complex and difficult to position accurately, especially when orthogonal to the longitudinal direction, requiring powerful docking mechanisms and struggling with positioning accuracy.
Innovation Solution
The implementation of multiple positioning mechanisms with different structures along the longitudinal direction of the bed, including first and second positioning mechanisms, allows for detachable and precise positioning at various points, using elements like pins, slots, and L-shaped members to simplify the docking process and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single docking mechanism is used for bed positioning, then the structure is simple, but positioning accuracy is insufficient especially orthogonal to the longitudinal direction
Solution Approach 1:
The positioning mechanism is divided into multiple independent positioning mechanisms located at different positions along the longitudinal direction of the bed. Each positioning mechanism can independently position the bed at its specific location, allowing for precise positioning without requiring a single complex docking mechanism. This segmentation enables accurate positioning orthogonal to the longitudinal direction while keeping each individual positioning mechanism relatively simple in structure.
2Measurement precision
If a powerful docking mechanism is used to ensure positioning accuracy, then positioning precision is improved, but the mechanism becomes complex and durability decreases
Solution Approach 1:
Instead of using one powerful docking mechanism that would be complex and less durable, the system employs multiple simpler positioning mechanisms distributed along the bed's longitudinal direction. Each mechanism handles a portion of the positioning task, reducing the load and complexity on each individual mechanism while collectively achieving high positioning accuracy. This distribution of function improves overall system reliability.
Solution Approach 2:
Different positioning mechanisms are positioned at different locations along the longitudinal direction of the bed, with each mechanism optimized for its specific location. This local optimization allows each positioning mechanism to be simpler in structure while collectively providing accurate positioning throughout the entire bed-gantry interface, thereby improving durability without sacrificing precision.
3Measurement precision
If multiple positioning mechanisms with different structures are used along the longitudinal direction, then positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The positioning system is segmented into multiple independent positioning mechanisms placed at different positions along the longitudinal direction. Each positioning mechanism has a relatively simple structure but collectively they achieve high positioning accuracy by working in combination. This segmentation approach breaks down the complex task of precise positioning into multiple simpler sub-tasks.
Solution Approach 2:
The multiple positioning mechanisms serve universal positioning functions at different locations along the bed. Each mechanism can independently perform positioning operations, and together they provide comprehensive positioning capability for the entire bed-gantry interface. This multi-functionality allows the system to achieve high positioning accuracy without requiring each individual mechanism to be overly complex.
Data Source
AI summary
According to one embodiment, a magnetic resonance imaging apparatus includes a gantry and a movable bed. A magnet, a gradient coil, and a radio frequency coil are built in the gantry. The movable bed is configured to be positioned to the gantry by a positioning mechanism having different structures at different positions in a longitudinal direction of the bed.