Digital IF Spectrometer Control for Sideband-Suppressed Magnetic Resonance
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Solution Overview
Problem
Existing magnetic resonance systems face challenges in achieving precise control and detection of spin systems due to noise, fluctuations, and unwanted sidebands, which affect signal quality and accuracy.
Innovation Solution
Implementing a digital operation of a magnetic resonance system using a superheterodyne spectrometer system controlled by a field programmable gate array (FPGA) for precise pulse generation and detection, which includes digital intermediate frequency (IF) signal processing to suppress local oscillator leakage and unwanted sidebands, maintaining phase coherence, and enhancing control bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If analog operation is used in magnetic resonance systems, then device complexity is reduced, but signal-to-noise ratio deteriorates due to noise and fluctuations
Solution Approach 1:
The patent replaces analog electronic systems with digital systems for pulse generation and signal detection. Specifically, digital-to-analog converters (DACs) generate pulse sequences from digital waveforms, and analog-to-digital converters (ADCs) detect and digitize resonance signals. This substitution of digital electronics for analog operation improves signal-to-noise ratio while maintaining manageable device complexity through standardized digital components.
2Device complexity
If local oscillator leakage is not suppressed, then device complexity is reduced, but measurement precision deteriorates due to unwanted sidebands
Solution Approach 1:
The patent applies preliminary anti-action by implementing digital signal processing techniques that pre-compensate for and suppress local oscillator leakage before it affects measurements. The system uses digital filtering and frequency domain processing to identify and eliminate unwanted sidebands and leakage signals, thereby improving measurement accuracy without requiring additional complex hardware suppression circuits.
3Measurement precision
If digital operation is implemented, then signal-to-noise ratio improves, but device complexity increases
Solution Approach 1:
The patent introduces digital signal processing as an intermediary layer between the pulse generation system and the resonance detection system. Digital waveforms are converted to analog pulses via DACs, and resonance signals are converted back to digital via ADCs for processing. This intermediary digital domain allows for precise control and noise filtering while using standard converter components to manage overall system complexity.
4Device complexity
If phase coherence is not maintained, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent implements feedback mechanisms in the digital signal processing chain to maintain phase coherence throughout the pulse sequence and detection process. The system uses reference signals and phase tracking algorithms to monitor and correct phase drift in real-time, ensuring stable amplitude and phase measurements. This digital feedback approach maintains coherence without requiring overly complex analog phase-lock circuits.
Data Source
AI summary
In a general aspect, a magnetic resonance system performs a magnetic resonance measurement. In some examples, a magnetic resonance system includes data processing apparatus and a superheterodyne spectrometer system. The data processing apparatus generates digital intermediate frequency (IF) signal information based on a pulse profile. The digital IF signal information is configured to suppress an image sideband in a magnetic resonance control signal. The superheterodyne spectrometer generates the magnetic resonance control signal based on the digital IF signal information.