Low-Field MRI With Sparse Sampling to Reduce Imaging Artifacts
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Solution Overview
Problem
Existing magnetic resonance imaging (MRI) systems face challenges with high magnetic susceptibility and chemical shift artifacts, especially at high field strengths, leading to spatial distortions and decreased signal-to-noise ratios, which are exacerbated by parallel imaging techniques.
Innovation Solution
The implementation of a low field strength MRI system (less than 1.0 Tesla) utilizing sparse sampling techniques without parallel imaging, combined with low gradient fields, high flip angles, and controlled RF bandwidths, to minimize artifacts and maintain high spatial integrity and signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high field strength MRI is used, then signal-to-noise ratio is improved, but magnetic susceptibility artifacts and chemical shift artifacts increase
Solution Approach 1:
The patent changes the operating field strength parameter from conventional high field (1.5T or 3T) to low field (0.35T), which fundamentally alters the artifact characteristics. At low field strength, the magnetic susceptibility artifacts and chemical shift artifacts are significantly reduced because these artifacts are directly proportional to the main field strength, while still achieving adequate signal-to-noise ratio through optimized pulse sequences and imaging parameters
2Productivity
If parallel imaging techniques are used, then imaging speed is improved, but spatial distortions and artifacts are exacerbated
Solution Approach 1:
The patent extracts and removes the parallel imaging component from the imaging system, choosing to operate without it. This eliminates the spatial distortions and artifact exacerbation that come with parallel imaging techniques, while the imaging speed is maintained through optimized single-coil imaging sequences and low field strength advantages
3Object-affected harmful factors
If low field strength is used, then artifacts are reduced, but signal-to-noise ratio decreases
Solution Approach 1:
The patent optimizes multiple imaging parameters specifically for low field operation, including using gradient-echo sequences with appropriate echo times, adjusting flip angles, and tuning bandwidth settings to maximize signal-to-noise ratio at 0.35T while maintaining the artifact reduction benefits of low field strength
Solution Approach 2:
The patent employs a composite approach combining low field strength magnet (0.35T) with optimized gradient systems and RF coil configurations, creating a hybrid system that achieves both artifact reduction and adequate signal-to-noise ratio through the synergistic combination of these components
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
This approach achieves high-quality MRI with reduced distortions, enabling high frame rate cine imaging and real-time diagnostic and interventional applications, while minimizing patient heating and radiation exposure.
Implementation Method 1
a low field strength main magnet
Implementation Method 2
a strong magnetic field (modified with weak gradient fields applied across it to localize and encode or decode phases and frequencies)
Implementation Method 3
Magnetic resonance imaging (MRI), or nuclear magnetic resonance imaging, is a noninvasive imaging technique that uses the interaction between radio frequency pulses, a strong magnetic field
Data Source
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AI summary
Improved magnetic resonance imaging systems, methods and software are described including a low field strength main magnet, a gradient coil assembly, an RF coil system, and a control system configured for the acquisition and processing of magnetic resonance imaging data from a patient while utilizing a sparse sampling imaging technique.