Multichannel MRI Hand Coil with Segmented Rings
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Solution Overview
Problem
Existing MRI coils struggle to provide high-resolution images of the hand with a sufficient signal-to-noise ratio, especially for regions like the fingers, due to inadequate coil illumination and interference from surrounding tissue, while previous solutions are either spatially restricted or require complex patient preparation.
Innovation Solution
A multichannel local coil with coil elements arranged in multiple rings of varying diameters and positions, allowing for high-resolution imaging of the entire hand with a high signal-to-noise ratio, and the ability to selectively image individual regions by switching off specific coil rings or elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional single-channel or limited-channel coil is used for hand imaging, then the device complexity is low, but the signal-to-noise ratio and image resolution are insufficient
Solution Approach 1:
The coil is divided into multiple independent channel elements (first channel element, second channel element, third channel element, fourth channel element) arranged in a specific geometric pattern. Each element can be independently optimized for signal reception, allowing the system to achieve high resolution imaging through combined data from multiple segments while maintaining manageable individual element complexity
Solution Approach 2:
The coil elements are arranged in a three-dimensional configuration around the imaging region, with elements positioned at different spatial locations and orientations. This dimensional arrangement allows the coil to capture signals from multiple angles and depths, significantly improving signal-to-noise ratio and image resolution without requiring each individual element to be overly complex
2Adaptability or versatility
If a coil with fixed geometry is used, then the ease of operation is high, but the adaptability to different hand positions and imaging regions is limited
Solution Approach 1:
The coil assembly incorporates flexible positioning mechanisms that allow the entire coil structure or individual elements to be adjusted dynamically. The coil can be positioned and repositioned to accommodate different hand sizes, orientations, and imaging requirements, making the system adaptable without requiring complex rigid adjustment mechanisms
Solution Approach 2:
The multi-channel coil design with its symmetric arrangement of elements creates a universally applicable imaging solution that can capture signals from various hand positions and orientations. The same coil structure can be used for different imaging regions (fingers, palm, wrist) by simply adjusting the positioning, eliminating the need for multiple specialized coils
3Measurement precision
If coil elements are densely arranged to improve signal coverage, then the signal-to-noise ratio improves, but the interference from surrounding tissue increases
Solution Approach 1:
Each coil element is designed with specific geometric characteristics and orientation optimized for its local position around the hand. The elements have different sensitivities and reception patterns tailored to their specific spatial location, allowing the system to maximize signal-to-noise ratio in each local region while minimizing pickup of interference from surrounding tissues that are not in the immediate vicinity of each element
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 high-resolution, high-signal-to-noise ratio imaging of the entire hand, including the wrist and finger joints, with reduced risk of incorrect coil positioning and improved clinical validity, particularly for rheumatic arthritis examinations.
Implementation Method 1
Magnetic resonance imaging (MRI) for examining objects or patients by magnetic resonance imaging are known
Data Source
AI summary
A method and a local coil for a magnetic resonance imaging (MRI) system are provided. The local coil includes a hand coil having a plurality of rings, each made of a plurality of coil elements.