Magnetic Resonance System with Radio Frequency Shield Having Frequency-Dependent Shielding Effect

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This patent describes a magnetic resonance (MR) system that uses a special radio-frequency (RF) shield positioned between the main magnet and the whole-body antenna. The RF shield provides strong shielding specifically at the frequency used to excite nuclei for MR measurements, but offers much less shielding at frequencies just above and below this range. This selective shielding helps improve the quality of the MR signals detected from patients.

Use CasesContent extracted from patent full text and abstract with AI.

• Magnetic resonance imaging (MRI) scanners for hospitals and diagnostic centers
• High-precision magnetic resonance research equipment
• Industrial MRI systems for non-destructive testing and material analysis
• Preclinical imaging systems for laboratory research on animals

BenefitsContent extracted from patent full text and abstract with AI.

• Enhanced signal quality by minimizing interference at the precise excitation frequency
• Reduced background noise and artifacts in MR imaging
• Allows for targeted shielding without broadly dampening all frequencies, preserving communication or signal transmission at adjacent frequencies
• Improved customization of MRI system performance for different applications

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Patent Abstract

A magnetic resonance system has a basic magnet that generates a static basic magnetic field in an examination volume, and a whole-body antenna that emits a homogeneous radio-frequency field in the examination volume, the homogeneous radio-frequency field exhibiting an excitation frequency so that nuclei in an examination subject in the examination volume are excited to emit magnetic resonance signals, and a radio-frequency shield. The radio-frequency shield is arranged between the whole-body antenna and the basic magnet. The whole-body antenna is arranged between the radio-frequency shield and the examination volume. The radio-frequency shield is fashioned to exhibit a high shielding effect in a shielding frequency range that encompasses the excitation frequency. The shielding effect drops to a significantly lower shielding effect on both sides at side bands adjoining the shielding frequency range. The shielding frequency range and the side bands exhibit bandwidths that are significantly smaller than the excitation frequency.