MRI RF Coil Frame Separating Transmit Homogeneity From Receive SNR
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Solution Overview
Problem
Existing RF coils in MRI systems face challenges in balancing the homogeneity of the magnetic field generated by RF transmit coils with the signal-to-noise ratio (SNR) optimization of RF receive coils, as they have competing design considerations that compromise efficiency when combined in a single apparatus.
Innovation Solution
The development of an RF coil apparatus with a rigid frame comprising a first and second plate, where an RF transmit coil is wound in multiple turns around the frame, separated from the patient anatomy to ensure magnetic field homogeneity, while allowing interchangeable RF receive coils to maximize SNR by positioning them close to the patient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RF transmit coil is positioned close to patient anatomy to maximize SNR, then signal-to-noise ratio is improved, but magnetic field homogeneity deteriorates
Solution Approach 1:
The RF coil system is divided into separate transmit and receive coils. The transmit coil is positioned away from the patient to maintain field homogeneity, while the receive coil is positioned close to the patient to maximize SNR. This segmentation allows each coil to be optimized for its specific function without compromise.
Solution Approach 2:
The receive coil function is extracted and separated from the transmit coil. The transmit coil focuses solely on generating homogeneous RF fields, while the receive coil independently handles signal detection close to the patient. This extraction resolves the spatial positioning conflict between the two functions.
2Stability of the object's composition
If RF transmit coil is positioned away from patient anatomy to ensure magnetic field homogeneity, then homogeneity is improved, but signal-to-noise ratio deteriorates
Solution Approach 1:
The RF coil system is divided into separate transmit and receive coils. The transmit coil is positioned away from the patient to maintain field homogeneity, while the receive coil is positioned close to the patient to maximize SNR. This segmentation allows each coil to be optimized for its specific function without compromise.
3Device complexity
If RF transmit coil and RF receive coil are combined in a single apparatus, then device complexity is reduced, but efficiency deteriorates due to competing design considerations
Solution Approach 1:
The RF coil system is divided into separate transmit and receive coils that can be independently optimized. The transmit coil is designed for field homogeneity with appropriate positioning and geometry, while the receive coil is designed for maximum SNR with different positioning and geometry. This segmentation eliminates the design compromises required in combined coil systems.
Solution Approach 2:
The system is designed to accept interchangeable receive coils for different imaging applications (e.g., surface coils, volume coils, phased array coils). This multi-functionality allows the system to maintain simplicity while adapting to various imaging needs without compromising the transmit coil's homogeneity performance.
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 maintains magnetic field homogeneity and efficiency of RF transmit coils while enabling flexible use of RF receive coils, optimizing both homogeneity and SNR for improved MRI imaging quality.
Implementation Method 1
an RF transmit coil comprising a plurality of conductors connected in series, the plurality of conductors being wound around the frame and forming a plurality of turns
Implementation Method 2
a B0 magnet that produces a B0 magnetic field
Data Source
AI summary
A radio frequency (RF) coil apparatus is described herein for facilitating imaging of a patient positioned within a magnetic resonance imaging (MRI) system, the MRI system comprising a B0 magnet. The apparatus may comprise a frame comprising a first plate and a second plate disposed opposite the first plate; and an RF transmit coil comprising a plurality of conductors connected in series, the plurality of conductors being would around the frame and forming a plurality of turns. According to some aspects, there is provided an MRI system configured to image a patient positioned within the MRI system, the MRI system comprises a B0 magnet that produces a B0 magnetic field and the RF coil apparatus.