Predictive Thermal Control for MR Imaging Systems
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Solution Overview
Problem
Current MR imaging systems face limitations in performing enhanced imaging processes due to reactionary thermal management systems that halt operations based on predefined power limits, leading to unnecessary restrictions and increased scan times, as they do not dynamically adjust power consumption according to actual thermal output and specific imaging parameters.
Innovation Solution
A system and method that predictively controls thermal output by dynamically adjusting power consumption based on operational parameters, using a thermal controller to maintain actual thermal output within desired limits, allowing for enhanced imaging protocols without exceeding temperature thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If enhanced imaging processes are used to improve image resolution and scan speed, then imaging quality and productivity are improved, but thermal dissipation increases and may exceed desirable limits
Solution Approach 1:
The patent implements dynamic thermal management by continuously monitoring actual bore temperature and gradient coil temperatures, then adjusting gradient power in real-time. This allows the system to operate at higher power levels for enhanced imaging when thermal conditions permit, while dynamically reducing power when temperature thresholds are approached, thus resolving the contradiction between maintaining high scan speed and controlling thermal dissipation.
Solution Approach 2:
The system changes operational parameters (gradient power levels, duty cycles) based on actual thermal conditions rather than using fixed conservative limits. By monitoring temperatures and adjusting power parameters dynamically, the system can safely operate at higher power levels for enhanced imaging processes, improving productivity without exceeding thermal limits.
2Reliability
If predefined hard limits on coil current are imposed to prevent excessive temperatures, then thermal safety is ensured, but the MR imaging device is restricted from performing capable processes and diagnostic capability is reduced
Solution Approach 1:
The patent employs feedback control by continuously monitoring actual bore temperature and gradient coil temperatures, then using this information to dynamically adjust gradient power. This feedback mechanism allows the system to safely operate beyond conservative predefined limits when actual thermal conditions permit, thereby maintaining thermal safety while expanding process capability and diagnostic versatility.
Solution Approach 2:
The system performs preliminary thermal assessment by monitoring temperatures before and during imaging processes, then proactively adjusts power levels to prevent excessive heating. This preliminary action approach allows the system to maintain higher power levels for enhanced imaging when thermal conditions are favorable, rather than being restricted by conservative predetermined limits.
3Reliability
If reactionary BTMS halts operation when temperature exceeds threshold, then thermal limits are enforced, but scan time increases and throughput decreases
Solution Approach 1:
The patent implements preliminary thermal management by continuously monitoring temperatures and proactively adjusting gradient power before temperature thresholds are exceeded. This prevents the need for reactionary scan halts, allowing enhanced imaging processes to complete without interruption, thus maintaining reliable temperature control while avoiding time loss from scan interruptions.
Solution Approach 2:
The system dynamically adjusts gradient power in real-time based on actual thermal conditions, allowing smooth transitions in power levels rather than abrupt halts. This dynamic control maintains temperature within desirable limits while enabling enhanced imaging processes to proceed without the scan time losses associated with reactionary BTMS interruptions.
4Reliability
If conservative assumptions about use profile and boundary conditions are used, then thermal limits are not exceeded, but power consumption is unnecessarily restricted and enhanced imaging processes are precluded
Solution Approach 1:
The patent uses feedback from actual temperature monitoring to determine appropriate power levels, replacing conservative assumptions with real-time thermal data. This allows the system to consume more power for enhanced imaging processes when actual thermal conditions permit, while still ensuring compliance with thermal limits, thus optimizing the balance between power consumption and thermal safety.
Solution Approach 2:
The system changes power consumption parameters dynamically based on actual thermal conditions rather than maintaining conservative fixed limits. By adjusting power levels according to real-time temperature data, the system can utilize higher power consumption for enhanced imaging when thermal conditions allow, while maintaining reliable thermal limit compliance.
Data Source
AI summary
A system and method for controlling thermal output of a medical device is disclosed. A thermal controller receives operational parameters for an impending use of a medical device and predicts a thermal output of the medical device from the operational parameters. The thermal controller compares the predicted thermal output to a desired limit on thermal output and, if the predicted thermal output exceeds the desired limit on thermal output, dynamically controls power consumption by the medical device to maintain an actual thermal output substantially at or below the desired limit on thermal output during use of the medical device.