MR Scanner Control Computer Sequence Simulation for RF Limit Compliance
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Solution Overview
Problem
Magnetic resonance systems operating with the FPO:B option often interrupt MR data recording when limit values are violated, resulting in incomplete or no MR images being produced for patients with implants, due to the inability to ensure compliance with specific RF pulse and gradient field limits during data acquisition.
Innovation Solution
A method where a control computer simulates the imaging sequence to determine the maximum RF output and gradient performance, verifying if these exceed predetermined limits, and adjusts parameters such as flip angle, repetition time, and slice thickness to avoid limit violations, ensuring safe data acquisition without interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the magnetic resonance system operates with the FPO:B option to ensure limit value compliance, then patient safety is improved, but the MR data recording is interrupted when limits are violated, resulting in incomplete or no images
Solution Approach 1:
The system performs a preliminary simulation of the imaging sequence before actual data acquisition to determine the maximum RF output and gradient performance. This advance calculation allows the system to identify potential limit violations before they occur during scanning, enabling parameter adjustment or warning issuance to prevent interruption and ensure complete, safe imaging
Solution Approach 2:
The simulation results provide feedback on whether the imaging sequence will violate limit values. Based on this feedback, the system can adjust parameters or alert the operator before scanning begins, creating a closed-loop control system that prevents interruptions while maintaining safety compliance
2Reliability
If the imaging sequence parameters are adjusted to comply with limit values, then safety compliance is improved, but the imaging quality or scan time may be compromised
Solution Approach 1:
The system automatically adjusts imaging parameters such as flip angle, repetition time, and slice thickness based on simulation results to ensure limit value compliance while maintaining optimal imaging quality. This systematic parameter optimization allows the sequence to meet safety requirements without sacrificing diagnostic value
Data Source
AI summary
In a magnetic resonance (MR) apparatus and an operating method therefor, a sequence with which the MR data are to be recorded is created in or provided to a control computer of the MR apparatus. A maximum RF output and a maximum gradient performance of the scanner magnetic resonance apparatus during the performance of the sequence are determined by simulating or analyzing the performance of the sequence in the control computer, and it is verified whether the maximum RF output and/or the maximum gradient performance violate predetermined limit values. Execution of the sequence to record the MR data is performed only if the verification showed that the limit values are not violated.