Interference Suppression Antennas for MR Body Coil Emissions
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Solution Overview
Problem
Magnetic resonance tomography systems face challenges in achieving stable interference suppression due to various interference influences, leading to inefficiencies in shielding emissions and immissions.
Innovation Solution
The system employs transmission interference suppression antennas with spatial transmission characteristics matching the body coil, generating interference suppression signals that, through destructive interference, reduce the irradiation of excitation signals outside the patient tunnel, using shared electrical conductors and phase shifts to optimize cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expensive shielding cabins are installed to reduce both emissions and immissions, then interference suppression is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the interference suppression function from the bulky shielding cabin structure and implements it through compact transmission interference suppression antennas positioned at the patient tunnel opening. These antennas generate counter-phase electromagnetic fields that cancel out transmitted interference signals, achieving the same protection without requiring a complete enclosure.
Solution Approach 2:
The patent replaces the mechanical/physical shielding approach (metallic shielding cabins) with an electromagnetic field-based approach (transmission interference suppression antennas generating counter-phase fields). This substitution eliminates the need for heavy metallic structures while achieving interference suppression through electromagnetic interference principles.
2Object-generated harmful factors
If transmission interference suppression antennas are used to reduce emissions, then interference suppression is improved, but stable suppression with different interference influences remains difficult to achieve
Solution Approach 1:
The patent implements dynamic control of the transmission interference suppression antennas through a control unit that adjusts the phase and amplitude of the transmitted signals in real-time. This dynamic adjustment allows the system to adapt to varying interference conditions and maintain stable suppression across different scenarios.
Solution Approach 2:
The patent incorporates feedback mechanisms where received signals are processed to generate control signals for the transmission interference suppression antennas. This feedback loop enables the system to continuously optimize interference suppression based on actual interference conditions, improving stability across different operating scenarios.
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 effectively minimizes interference emissions by ensuring destructive interference of excitation and interference signals, improving signal-to-noise ratio and reducing the need for expensive shielding cabins.
Implementation Method 1
The first transmission interference suppression antenna is configured to provide a spatial transmission characteristic that may be compared with the body coil. A first interference suppression signal is simultaneously emitted by the first transmission interference suppression antenna, in order to reduce, as a result of a destructive interference of both signals, an irradiation of the excitation signal outside of the patient tunnel.
Data Source
AI summary
A magnetic resonance tomography system that includes a transmitter for generating an excitation signal and a body coil for emitting the excitation signal, and a method for operation of the magnetic resonance tomography system are provided. The magnetic resonance tomography system has a patient tunnel, in which the body coil is arranged. The magnetic resonance tomography system also has a first transmission interference suppression antenna that is arranged between the body coil and an opening in the patient tunnel. The first transmission interference suppression antenna is configured to provide a spatial transmission characteristic that may be compared with the body coil.