Radio frequency coil with transmission line end-rings

Abstract

A radio frequency coil for transmitting or receiving signals at a magnetic resonance frequency includes an arrangement of substantially parallel rungs (70, 70', 70'') and one or more generally annular strip-type end-rings (78, 78', 78'', 80) disposed generally transverse to the parallel rungs and connected with the rungs. Each generally annular strip-type end-ring includes at least two conductor layers (82, 82', 82'', 84, 84', 84'', 86, 88) separated by a dielectric layer (72, 72a, 72b). A radio frequency shield (34) substantially surrounds the arrangement of substantially parallel rungs (70,70', 70''). At least one of the conductor layers of each end-ring is connected with the radio frequency shield.

Description

RF Coils with Transmission Line End Rings technical field The following content relates to the field of magnetic resonance. It has particular application to magnetic resonance imaging coils and scanners and is described with particular reference thereto. More generally, it applies to magnetic resonance systems for imaging, spectroscopy, and the like. Background technique The end-rings of radio frequency coils for magnetic resonance applications carry extremely high currents. Usually the number of rungs determines the current on the end ring, with more rungs producing a higher end ring current / runk current ratio. For N rungs, this current ratio is estimated as 1 / 2 - 2 · cos ( φ ) , Here, φ=2·π / N. For N=16, this yields an end ring current / runk current ratio of 2.56. These high-side ring currents can lead to degraded coil performance due to high local specifi...

AI Technical Summary

Problems solved by technology

However, coaxial transmission line end rings complicate manufacturing due to the increased complexity of the end ring and the need to couple the rungs to the armored inner conductor of the end ring

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