MRI Body Coil Pre-Amplifier Detuning via High Reflection
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Solution Overview
Problem
Conventional body coils in MRI systems suffer from coupling issues with local coils, leading to detuning and noise interference, which deteriorate image quality and require complex detune circuits that increase costs and reduce reliability.
Innovation Solution
A body coil design with a pre-amplification unit at the feed point having a high input reflection factor, eliminating the need for detune circuits by using high or low impedance to dampen antenna resonance and minimize coupling, allowing simultaneous transmission and reception without PIN diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If detune circuits with PIN diodes are used to suppress coupling, then coupling between body coil and local coils is reduced, but device complexity and cost increase
Solution Approach 1:
The patent extracts and removes the detune circuits with PIN diodes from the body coil system. Instead of using active detuning components, the invention uses the pre-amplification unit's high input impedance to passively suppress coupling, thereby eliminating complex detune circuits while maintaining the desired decoupling effect.
Solution Approach 2:
The pre-amplification unit serves dual functions: it amplifies received signals and simultaneously suppresses coupling through its high input reflection factor. This self-service approach eliminates the need for separate detune circuits, reducing device complexity while maintaining coupling suppression.
2Object-affected harmful factors
If detune circuits are used to minimize coupling, then noise coupling is reduced, but reliability decreases due to additional components
Solution Approach 1:
The patent removes detune circuits with PIN diodes from the system. By relying on the pre-amplification unit's inherent high input impedance to suppress noise coupling, the invention eliminates failure-prone components while maintaining noise suppression performance, thereby improving reliability.
3Power
If conventional pre-amplification units are used, then signal amplification is achieved, but coupling to local coils increases
Solution Approach 1:
The patent changes the input reflection factor parameter of the pre-amplification unit to be greater than 0.7 (preferably >0.8 or >0.9). This parameter change creates a high input impedance that simultaneously enables signal amplification and suppresses coupling to local coils through impedance mismatch.
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 design simplifies the body coil, reduces material and labor costs, enhances reliability, and increases efficiency by avoiding losses and disruptions in signal routing, while maintaining high image quality and signal homogeneity.
Implementation Method 1
The pre-amplification unit has an input reflection factor at the feed point of the antenna unit whose value is greater than 0.7, greater than 0.8, or greater than 0.9
Data Source
AI summary
The embodiments relate to a body coil, to a magnetic resonance device, and to a method for operating a magnetic resonance device. The body coil includes at least one antenna unit and at least one pre-amplification unit, wherein the pre-amplification unit is arranged at a feed point of the antenna unit, wherein the pre-amplification unit has an input reflection factor at the feed point of the antenna unit whose value is greater than 0.7.