Nuclear Medicine Imaging Rotor Tension Control
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Solution Overview
Problem
Nuclear Medicine Imaging devices face challenges in efficiently controlling the movement and tension of rotating parts, such as the rotor and extendable arms, which affects the accuracy and reliability of imaging processes.
Innovation Solution
The implementation of a rotor driving assembly with a flat open belt and a tensioning system controlled by a controller, along with a linear drive system using bidirectional motors and encoders for precise movement and positioning, ensures accurate and controlled rotation and extension of scanning units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional rotor driving system is used, then the structure is simple, but the positioning precision and tension control are insufficient
Solution Approach 1:
The patent replaces traditional mechanical positioning systems with an encoder-based feedback system. The encoder measures the actual position of the rotor and provides feedback to the controller, which adjusts the motor output to achieve precise positioning. This substitution of direct mechanical coupling with sensor-based control resolves the contradiction by achieving high positioning precision without requiring overly complex mechanical structures.
Solution Approach 2:
The patent implements a feedback control system where encoders continuously monitor the position and tension of moving parts, and the controller adjusts motor commands based on this feedback to maintain desired positioning and tension levels. This closed-loop feedback mechanism enables precise control while keeping the overall system architecture relatively simple and modular.
2Reliability
If manual tensioning is used, then the device complexity is low, but the reliability and consistency of tension control are poor
Solution Approach 1:
The patent employs tension sensors that continuously monitor belt tension and provide feedback to the controller. The controller automatically adjusts motor torque to maintain consistent tension levels, eliminating the variability and unreliability of manual tensioning. This automated feedback control achieves high reliability without requiring complex mechanical tensioning mechanisms.
Solution Approach 2:
The system performs self-adjustment of tension through the feedback loop, where the controller automatically compensates for tension variations without external intervention. The motor system self-regulates to maintain optimal tension based on encoder and sensor feedback, reducing the need for manual adjustment mechanisms and improving reliability.
3Adaptability or versatility
If extendable arms are used to improve scanning coverage, then the versatility is improved, but the control of movement and tension becomes more difficult
Solution Approach 1:
The patent implements dynamically adjustable extendable arms that can change their length and position during operation. The motorized extension mechanism allows the arms to adapt to different scanning requirements, improving versatility. The encoder-based position feedback ensures that even as the arms extend or retract, their position remains precisely controlled, maintaining ease of operation despite the added complexity of extendability.
4Manufacturing precision
If precise positioning systems are implemented, then the image quality improves, but the device complexity and maintenance requirements increase
Solution Approach 1:
The patent replaces complex mechanical positioning mechanisms with motorized drives combined with encoder feedback. This substitution reduces the number of mechanical components such as gears, belts, and linkages that would require maintenance, while maintaining high positioning accuracy through electronic control. The modular motor-encoder assemblies are easier to service than traditional mechanical positioning systems.
Data Source
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AI summary
A Nuclear Medicine (N-M) imaging system including a gantry having a stationary stator and a rotor rotatably mounted on the stator and including detection units. The rotor is driven by a rotor driving assembly including a linear encoder. The detection units mounted on the rotor include scanning columns having one or more Multi-Pixel Photon Counter (MPC) mounted on one or more extendable arm. The gantry also includes flat cables connecting the controller with gantry components, e.g., the scanning column Multi-Pixel Photon Counters (MPC). The scanning columns are pivotably moveable by a scanning column driver system including a rotary encoder.