Magnetic Resonance Receive Chain Delay Compensation
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Solution Overview
Problem
Magnetic resonance apparatuses face challenges in maintaining a deterministic time reference for signal processing due to variable delays caused by digital signal processing and transmission, especially when local coils are changed, which can affect signal quality and system flexibility.
Innovation Solution
The magnetic resonance apparatus includes a local coil with a detachable wireless connection for signal and control signal transmission, featuring a central clock for synchronization with a local clock to establish a predetermined phase relationship and absolute time reference, allowing for calibration measurements to determine and compensate for variable delays, thereby simplifying system architecture and improving user convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a detachable wireless connection is used for local coil, then system flexibility and ease of operation are improved, but signal transmission delay becomes variable and non-deterministic
Solution Approach 1:
The system performs preliminary calibration measurements to determine the variable delay characteristics of the wireless connection before actual signal processing occurs. This preliminary action enables the system to compensate for the non-deterministic delay in subsequent operations, resolving the contradiction between flexibility and time reference consistency.
Solution Approach 2:
The system continuously monitors and measures the actual delay in the wireless signal transmission path and uses this feedback information to adjust the timing references. By implementing feedback mechanisms that update delay compensation values, the system maintains reliable time references despite the flexibility of detachable wireless connections.
2Extent of automation
If digital signal processing is used, then signal processing capability is improved, but variable time delays are introduced
Solution Approach 1:
The system performs preliminary characterization of the digital signal processing path delays and stores this information for compensation. By preparing delay compensation data in advance, the system can maintain precise timing references while benefiting from automated digital signal processing capabilities.
Solution Approach 2:
The system dynamically adjusts timing parameters based on the detected delay characteristics of the digital signal processing path. By changing the temporal parameters of signal processing operations to compensate for introduced delays, the system maintains accurate time references despite the automation of signal processing.
3Adaptability or versatility
If local coil is changed, then adaptability to different examination objects is improved, but delay changes occur
Solution Approach 1:
The system performs preliminary delay measurement and calibration whenever a local coil is changed or potentially has different transmission characteristics. This preliminary calibration action ensures that delay compensation is updated to match the specific coil being used, maintaining precision while allowing coil interchangeability for different examination objects.
Solution Approach 2:
The system automatically detects when a local coil is changed and initiates self-calibration procedures to measure and compensate for the new coil's delay characteristics. This self-service capability maintains delay consistency without requiring manual intervention, supporting the adaptability of coil interchangeability.
Data Source
AI summary
A magnetic resonance apparatus and a method for operation of the magnetic resonance apparatus are provided. The magnetic resonance apparatus includes a local coil for acceptance and transmission of magnetic resonance signals to the magnetic resonance apparatus. A delay of the magnetic resonance signal between receipt by the local coil and arrival at the magnetic resonance apparatus is variable. In one act of the method, the magnetic resonance apparatus establishes a delay of the magnetic resonance signal between the local coil and the magnetic resonance apparatus and, in a further act, carries out a signal processing process of the transmitted magnetic resonance signal depending on the delay established.