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A MICROSTRIP BALUN ASSEMBLY FOR ON A RADIOFREQUENCY (RF) COIL

IP.com Disclosure Number: IPCOM000245587D
Publication Date: 2016-Mar-21
Document File: 3 page(s) / 105K

Publishing Venue

The IP.com Prior Art Database

Abstract

A microstrip balun assembly for on a radiofrequency (RF) coil is disclosed. The balun consists of an RF cable, a dielectric substrate and a ground plane. The ground plane is a part of an element of the RF coil. The RF cable shield is soldered to the RF coil ground point, and an appropriate dielectric substrate is selected to achieve high shield impedance at the end of the RF cable.

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A MICROSTRIP BALUN ASSEMBLY FOR ON A RADIOFREQUENCY (RF) COIL

BACKGROUND

 

The present disclosure relates generally to radiofrequency (RF) coils and more particularly to a microstrip balun assembly for RF coils.

MRI uses radio frequency pulses and magnetic field gradients applied to a subject in a strong homogenous magnetic field to produce viewable images. Typically, the region to be imaged is scanned by a sequence of measurement cycles in which the magnetic field gradients vary according to particular localization method being used. The resulting set of received MR signals are digitized and processed to reconstruct the image using one of many well known reconstruction techniques.

MR receiver coils receive electromagnetic signals emanating from the patient and use the acquired signals for image reconstruction. Before image reconstruction occurs, the electromagnetic signals received by the receiver coil elements are conditioned by a balun. The balun helps to improve performance of the receiver coils by providing a high impedance path for common-mode currents in the electromagnetic signal and a low impedance path for differential currents therein.

Various types of balun attached to RF coils of magnetic resonance imaging (MRI) system are generally known in the art.  The baluns attached to the RF coils provide a good shield current isolation, but generally require additional space to place the additional circuit of the balun or bazooka. Further, various grounding techniques for RF coils are known, which do not require additional space but these generally do not gain enough shield current isolation.

It would be desirable to have an improved balun for RF coils that does not require additional space for installation.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 depicts a microstrip balun assembled on the RF coil of an MRI system.

Figure 2 depicts the microstrip balun assembly.

DETAILED DESCRIPTION

A microstrip balun assembly for on a radiofrequency (RF) coil is disclosed. The balun consists of an RF c...