Segmented RF Coils for Simultaneous Volume Excitation in MRI
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Solution Overview
Problem
Magnetic resonance imaging (MRI) systems face limitations in efficiently exciting multiple volumes of a subject simultaneously while maintaining image resolution and minimizing interference between regions.
Innovation Solution
The MRI system incorporates a plurality of RF coils, including loop-type and strip-type RF coil elements, disposed in a direction aligned with the static magnetic field, with each coil set configured to apply RF fields to multiple slices of corresponding volumes, allowing simultaneous excitation and improved B1+ field uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single RF coil is used to excite multiple volumes, then the device complexity is reduced, but the interference between regions increases and image resolution deteriorates
Solution Approach 1:
The RF coil system is segmented into multiple independent RF coils, with each coil corresponding to a specific volume or region of interest. This segmentation allows independent control and excitation of different volumes, preventing interference between regions while maintaining manageable system complexity through modular design.
Solution Approach 2:
Each RF coil is designed with specific local characteristics tailored to its corresponding volume, optimizing the B1+ field distribution for that particular region. This local quality approach ensures high image resolution and minimal interference by customizing coil properties to match the specific imaging requirements of each volume.
2Productivity
If multiple RF coils are used to excite multiple volumes simultaneously, then the imaging speed increases, but the device complexity increases
Solution Approach 1:
The RF coil system is divided into multiple independent coils, each capable of simultaneous excitation of different volumes. This segmentation enables parallel processing of multiple imaging tasks, significantly increasing imaging speed while the modular nature of segmented coils keeps the complexity increase manageable.
Solution Approach 2:
Each RF coil is designed as a multi-functional element that can both transmit RF pulses for excitation and receive signals for imaging. This universality reduces the need for separate transmission and reception systems, thereby increasing imaging speed without proportionally increasing device complexity.
3Device complexity
If RF coils are disposed perpendicular to the static magnetic field direction, then the coil layout is simplified, but the B1+ field uniformity deteriorates
Solution Approach 1:
The RF coils are oriented parallel to the static magnetic field direction rather than perpendicular, utilizing the longitudinal dimension to optimize B1+ field distribution. This dimensional change in coil orientation enables better field uniformity while the modular coil design keeps the overall layout manageable.
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 configuration enables efficient simultaneous excitation of multiple volumes, enhances image resolution, and minimizes interference, allowing for quicker and more accurate MRI imaging.
Implementation Method 1
a main magnet configured to generate a static magnet field
Implementation Method 2
a gradient coil configured to generate a gradient magnetic field
Implementation Method 3
The MRI system includes elements that apply a radio frequency (RF) signal to a living tissue to make it resonate
Implementation Method 4
a radio frequency (RF) coil including a plurality of RF coils corresponding to volumes representing target regions of a subject
Data Source
AI summary
A magnetic resonance imaging (MRI) system includes a main magnet configured to generate a static magnetic field, a gradient coil configured to generate a gradient magnetic field, and a radio frequency (RF) coil arrangement including RF components corresponding to volumes representing target regions of a subject, each of the volumes including slices, each RF components including sets of RF coil elements, and each set of RE coil elements being configured to apply RF fields to a slice of the corresponding volume.