MRI Thermal Management via Dynamic Scan Adjustment
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Solution Overview
Problem
Magnetic resonance imaging (MRI) systems face thermal overload issues due to high heat loads during scans, leading to potential scan aborts, which necessitates oversized and energy-intensive chillers to prevent thermal runaway, increasing costs and operational expenses.
Innovation Solution
Implementing a monitoring system with sensors to track thermal parameters and adjust the execution of MRI scans in real-time or prior to execution, allowing for pauses, parameter modifications, or temporary cryo-compressor shutdowns to manage heat loads, enabling the use of lower-capacity chillers without compromising safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the chiller capacity is increased to meet the maximum credible heat load under worst-case operating conditions, then the system reliability against thermal runaway is improved, but the device complexity, installation cost, and energy consumption increase
Solution Approach 1:
The patent implements dynamic adjustment of scan parameters (gradient amplitude, duration, repetition rate) based on real-time thermal feedback from sensors monitoring coolant temperature and component heat loads. This allows the system to adapt cooling requirements to actual operating conditions rather than designing for static worst-case scenarios, enabling smaller chiller capacity while maintaining reliability
Solution Approach 2:
The system incorporates thermal sensors that continuously monitor coolant temperature and heat generating components, with this feedback used to dynamically adjust scan parameters or trigger cooling interventions. This closed-loop control prevents thermal runaway by responding to actual thermal conditions rather than relying on oversized passive cooling capacity
2Temperature
If the chiller capacity is increased to prevent thermal overload during high heat load scans, then the temperature control stability is improved, but the use of energy by the stationary object increases
Solution Approach 1:
The system dynamically adjusts cooling demand by modifying scan parameters in real-time based on thermal feedback, matching cooling requirements to actual heat loads rather than maintaining constant high-capacity cooling operation. This reduces average energy consumption while maintaining temperature control stability
Solution Approach 2:
The patent changes operational parameters (gradient strength, pulse duration, scan repetition rate) to reduce heat load when thermal limits are approached, thereby reducing the energy required for cooling while maintaining safe temperature control
3Reliability
If the chiller capacity is increased to handle maximum heat loads, then the system reliability is improved, but the loss of energy increases due to continuous operation at high capacity
Solution Approach 1:
Real-time thermal monitoring with feedback control adjusts scan execution and cooling demand to match actual thermal conditions, preventing energy waste from continuous high-capacity operation while maintaining reliability through dynamic intervention when needed
Solution Approach 2:
The system uses periodic thermal monitoring and adjusts scan parameters or triggers cooling actions only when thermal thresholds are approached, rather than maintaining continuous high-capacity cooling operation, thereby reducing energy loss while preserving reliability
Data Source
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AI summary
A magnetic resonance (MR) imaging apparatus comprises an MR imaging device (10) including a magnet (12) and heat generating components (18, 20, 22, 24). A cooling system (30) cools the heat generating components using chilled water from an air-cool chiller (28). Sensors (TS, VS) are configured to measure thermal parameters of the heat generating components or of the cooling system. An MR controller (40) controls the MR imaging device to execute an MR imaging examination program ("exam card") (42) and to adjust the execution of the MR imaging examination program in response to a thermal parameter measured by the one or more sensors indicating the cooling system has insufficient cooling capacity. The MR controller may also adjust the exam card prior to its execution if the cooling system (30) has insufficient cooling capacity at the current air temperature to dissipate the heat load as estimated by a power dissipation model (80).