Multi-Nuclear MRI Architecture for Simultaneous RF Excitation and Acquisition
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Solution Overview
Problem
Existing MRI systems struggle with synchronous imaging of multiple nuclides due to frequency resolution differences and lack of support for simultaneous excitation and reception of three or more types of nuclides, requiring additional data processing and sequential imaging methods.
Innovation Solution
A parallel scalable architecture with a multi-nuclear scanning and reconstruction computer, multi-nuclear scanning control unit, and integrated RF and gradient signal generation units, enabling simultaneous and independent control of RF transmission and reception for multiple nuclides using a distributed architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a frequency conversion module is added to achieve multi-nuclear imaging, then the capability to image multiple nuclides is improved, but the system complexity and additional data processing requirements increase
Solution Approach 1:
The system divides the multi-nuclear imaging function into independent parallel channels, each handling a specific nuclide frequency range. The spectrometer is segmented into multiple RF transmission channels and RF reception channels, allowing each channel to operate independently without interfering with others, thus reducing the complexity of unified frequency conversion processing.
Solution Approach 2:
The patent creates a universal parallel channel architecture that can handle multiple nuclides simultaneously. Each RF channel is designed with universal components (DAC, ADC, filtering circuits, gain control) that can process different nuclide frequencies through parameter configuration rather than requiring separate dedicated hardware for each nuclide, reducing overall system complexity.
2Productivity
If sequential imaging methods are used for multiple nuclides, then the system complexity is reduced, but the imaging efficiency and productivity decrease
Solution Approach 1:
The system enables continuous simultaneous acquisition of multiple nuclides through parallel RF channels. All nuclides are imaged concurrently in a single TR (repetition time) cycle rather than sequentially, eliminating the time loss from switching between nuclides and maintaining continuous useful imaging action across all targeted nuclides.
Solution Approach 2:
The patent implements periodic simultaneous excitation and acquisition for multiple nuclides within each TR cycle. The parallel channels are activated periodically at the same time, allowing synchronized imaging of all nuclides at regular intervals, which dramatically improves imaging efficiency compared to sequential periodic actions.
3Measurement precision
If additional frequency synthesizer is added for adjacent excitation, then synchronous reception capability is improved, but frequency resolution differences cause phase correction requirements
Solution Approach 1:
The system applies local quality filtering by assigning specific bandpass filtering circuits to each RF channel, tailored to the frequency characteristics of specific nuclides. Each channel's filtering is optimized locally for its target nuclide's frequency range, achieving precise frequency resolution without requiring global phase correction processing across all channels.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simultaneous and independent control of RF signals for multiple nuclides, reducing signal intensity differences and mutual interference, and allowing for scalable and precise MRI imaging of multiple nuclides without additional data processing.
Implementation Method 1
a gradient signal generation unit, and a gradient power amplifier; the gradient signal generation unit is also connected to a gradient power amplifier
Implementation Method 2
a multi-nuclear RF signal transmission unit, a multi-nuclear RF signal acquisition unit
Implementation Method 3
a multi-nuclear RF signal transmission unit, a multi-nuclear RF signal acquisition unit
Data Source
AI summary
A parallel scalable architecture and highly integrated Simulcast X-nuclei MRI system includes a multi-nuclear scanning and reconstruction computer and a multi-nuclear scanning control unit. The multi-nuclear scanning control unit includes a multi-nuclear timing sequence control engine, a multi-nuclear radio frequency (RF) signal transmission unit, a multi-nuclear RF signal acquisition unit, a gradient signal generation unit, and a multi-nuclear coil tuning control unit. The multi-nuclear timing sequence control engine is separately connected to the multi-nuclear RF signal transmission unit, the multi-nuclear RF signal acquisition unit, the gradient signal generation unit and the multi-nuclear coil tuning control unit. The parallel scalable architecture and highly integrated Simulcast X-nuclei MRI system is designed to support synchronous or time-sharing excitation and acquisition of signals of a plurality of types of nuclides, including but not limited to hydrogen, fluorine, phosphorus, sodium, and other nuclides.