Ultrafast MRI System Using 3D Receiver Coil Array
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Solution Overview
Problem
Current MRI technologies face limitations in achieving rapid three-dimensional imaging due to the need for magnetic gradient switching and RF pulses, which result in noise, reduced signal-to-noise ratio, and increased acquisition times, especially when using hybrid encoding techniques with multiple receiver coils.
Innovation Solution
A novel MRI system employs a 3D array of small receiver coils surrounding the imaging volume, utilizing a steady gradient field and a single RF excitation pulse for spatial encoding, eliminating the need for gradient reversals and additional RF pulses, and applying image reconstruction algorithms to generate 3D images without gradient or RF encoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If magnetic gradient switching and RF pulses are used for spatial encoding, then spatial encoding is achieved, but imaging time is increased and noise is generated
Solution Approach 1:
The patent extracts and eliminates the need for magnetic gradient switching and RF pulses from the spatial encoding process. By using a 3D array of receiver coils with different spatial sensitivities, the system removes these encoding mechanisms entirely, achieving ultrafast imaging without the time-consuming gradient reversals and RF excitations required by conventional MRI methods
Solution Approach 2:
The patent replaces the mechanical gradient switching system with a static magnetic field and an array of receiver coils. Instead of mechanically switching gradients to encode spatial information, the system uses the inherent spatial sensitivity profiles of multiple coils arranged in a 3D array, substituting a mechanical encoding approach with a sensor-array-based approach that enables parallel acquisition
2Speed
If gradient reversals are used for spatial encoding, then encoding speed is increased, but signal-to-noise ratio is reduced
Solution Approach 1:
The patent merges the spatial encoding function into the receiver coil array itself. By combining multiple coils with different spatial sensitivities into a unified 3D array system, the patent achieves both fast encoding (inherently parallel) and high SNR (through cooperative signal reception), resolving the contradiction between speed and signal quality that plagues gradient-reversal methods
3Productivity
If multiple receiver coils are used for parallel MRI, then acquisition speed is increased, but geometric factor reduces signal-to-noise ratio
Solution Approach 1:
The patent applies local quality by using receiver coils with highly localized and distinct spatial sensitivity profiles. Each coil in the 3D array is positioned and configured to sense magnetic resonance signals from specific regions of the imaging volume with unique sensitivity characteristics. This localized sensitivity differentiation enables effective parallel encoding while maintaining high signal-to-noise ratio, as each coil contributes optimally to its local region without the geometric penalties experienced by uniformly arranged coils in conventional pMRI
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 significantly reduces imaging time, increases MR signal acquisition rate, and minimizes noise, enabling faster and higher-quality 3D imaging while maintaining signal integrity, with the potential for real-time visualization of neuronal interactions.
Implementation Method 1
a magnet configured to generate a main magnetic field B0 in an imaging volume
Implementation Method 2
a radio-frequency (RF) pulse generator configured to apply an excitation RF pulse to the imaging volume
Implementation Method 3
a gradient field generator configured to generate a steady gradient field g in the imaging volume
Implementation Method 4
Each of the receiver coils is configured to simultaneously receive RF energy from the entire imaging volume during MR signal acquisition and output respective MR signals
Data Source
AI summary
Magnetic Resonance Imaging (MRI), which is given the acronym ULTRA (Unlimited Trains of Radio Acquisitions), can eliminate magnetic gradient reversals and allow simultaneous MR signal acquisition from the entire object volume in each of a multitude of very small receiver coils arranged in a 3D array around the imaging volume. This permits a rate of MR signal acquisition that is greatly increased (e.g. 256 times) compared with existing techniques, with a full 3D image constructed in as little as 1 millisecond. Furthermore, noise—both audible and electrical—is substantially reduced. The advantages over conventional MRI include:1. Clinical imaging can be completed in seconds, with good signal-to-noise ratio;2. Signal-to-noise ratio is further increased by eliminating RF noise due to gradient switching;3. Real-time functional MRI is possible, on millisecond timescales;4. With single breath holds, high quality imaging of thorax and abdomen is possible.5. ULTRA greatly reduces audible noise and vibration.