Digital IF Spectrometer Control for Magnetic Resonance Purity
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Solution Overview
Problem
Existing magnetic resonance systems face challenges in achieving precise control and detection of spin states due to noise, fluctuations, and unwanted signal interference, particularly from local oscillator leakage and image sidebands, which degrade performance and accuracy.
Innovation Solution
Implementing a digital control system using a field programmable gate array (FPGA) to generate and process intermediate frequency (IF) signals, allowing for precise pulse generation and suppression of local oscillator leakage and image sidebands without additional hardware, while maintaining phase coherence and single-sideband operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional analog control systems are used in magnetic resonance systems, then hardware complexity is reduced, but signal-to-noise ratio and control precision deteriorate due to noise and fluctuations
Solution Approach 1:
The patent replaces traditional analog control systems with a digital control system implemented on an FPGA. This substitution eliminates analog noise and fluctuations while providing precise digital control of pulse sequences and signal processing, directly resolving the contradiction between control precision and hardware complexity.
Solution Approach 2:
The patent changes the operational parameters from analog continuous signals to digital discrete signals. By using digital intermediate frequency signals with precise frequency and phase control, the system achieves superior signal-to-noise ratio and control accuracy while the FPGA integrates multiple functions that would otherwise require separate hardware components.
2Object-affected harmful factors
If additional hardware components are added to suppress local oscillator leakage and image sidebands, then signal interference is reduced, but device complexity increases
Solution Approach 1:
The patent converts the harmful local oscillator leakage and image sidebands into beneficial signals by using digital signal processing techniques. The FPGA digitally suppresses these interference components through algorithmic methods, transforming what would be hardware filtering problems into software-based solutions that reduce overall device complexity.
Solution Approach 2:
The patent introduces digital intermediate frequency signals as an intermediary between the radio frequency stage and baseband processing. This digital intermediary allows for precise control and suppression of interference components without requiring additional analog hardware filters or components.
3Productivity
If digital control systems are implemented, then signal-to-noise ratio and control bandwidth are enhanced, but system complexity increases
Solution Approach 1:
The patent implements a universal digital control system on the FPGA that performs multiple functions: pulse sequence generation, intermediate frequency signal processing, interference suppression, and data acquisition control. This multi-functional approach increases control bandwidth and productivity while avoiding the need for separate dedicated hardware for each function.
Solution Approach 2:
The patent merges multiple control and processing functions into a single integrated digital system on the FPGA. By combining pulse generation, signal modulation, interference suppression, and data processing in one unified digital architecture, the system achieves high control bandwidth without proportionally increasing overall system complexity.
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.