MRI Sequence Parameter Ranging Under Duration Limit Constraints
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Solution Overview
Problem
Existing methods for optimizing magnetic resonance sequences are insufficient for high-performance devices, as they fail to accurately account for duration limitations, leading to potential component overloads and reduced operational reliability.
Innovation Solution
A method that simulates a subsection of the magnetic resonance sequence, repeatedly expanding it to assess duration limitations, allowing for accurate prediction of parameter values within permissible ranges without simulating the entire sequence, thereby enhancing reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire magnetic resonance sequence is simulated to accurately assess duration limitations, then the reliability of component overload prevention is improved, but the computation time increases significantly
Solution Approach 1:
The magnetic resonance sequence is divided into a subsection that is representative of the entire sequence. The simulation is performed only on this subsection, which contains the critical performance requirements. This segmentation allows accurate assessment of duration limitations without the computational burden of simulating the entire sequence, thus resolving the contradiction between reliability and computation time.
Solution Approach 2:
Instead of performing a complete simulation of the entire magnetic resonance sequence, the method performs a partial simulation on a carefully selected subsection. This subsection is chosen to be representative and contains the critical performance requirements. The partial action is sufficient to determine permissible parameter value ranges while significantly reducing computation time compared to full sequence simulation.
2Reliability
If conservative limitations are applied to gradient values, then component protection is improved, but the performance utilization of the gradient system deteriorates
Solution Approach 1:
The method determines permissible parameter value ranges through simulation and optimization, replacing the traditional conservative fixed limitations. By changing from fixed conservative limits to dynamically determined permissible ranges, the system achieves both component protection and optimal performance utilization. The simulation identifies the actual safe operating boundaries, allowing higher gradient strengths to be used when appropriate.
3Productivity
If subsection simulation is used to reduce computation time, then productivity is improved, but the accuracy of duration limitation assessment deteriorates
Solution Approach 1:
The subsection is specifically selected to contain the critical performance requirements and representative characteristics of the entire magnetic resonance sequence. By concentrating the simulation on this locally optimized subsection with appropriate quality properties, the method achieves accurate duration limitation assessment without requiring full sequence simulation. The local quality of the subsection ensures it captures the essential behavior for reliable parameter determination.
Data Source
AI summary
Systems and methods for creating a magnetic resonance sequence for a magnetic resonance device. The magnetic resonance sequence is described by at least one sequence parameter and provided parameter values of the sequence parameters are used for the determination of a temporal sequence pattern over time by simulation of a subsection of the magnetic resonance sequence by a simulation unit. A permissible parameter value range for at least one selected one of the sequence parameters is determined by an evaluation unit on the basis of the temporal sequence pattern and provided limitations. A new parameter value of the at least one selected parameter within the permissible parameter value range is defined by a definition unit. At least one duration limitation relating to the entire duration of the magnetic resonance sequence, or a specified time constant is provided. The temporal sequence pattern is expanded beyond the subsection by the simulation unit by repetition of the subsection, until the entire duration or the specified time constant is reached or an abort criterion relating to the duration limitation is satisfied.