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LOW ELECTRIC-FIELD (E-FIELD) AND LOW SPECIFIC ABSORPTION RATE (SAR) RADIOFREQUENCY (RF) COIL DESIGN

IP.com Disclosure Number: IPCOM000238030D
Publication Date: 2014-Jul-28
Document File: 4 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention includes a technique to reduce E-field in a low-pass (LP) birdcage coil without affecting RF performance and image quality in a MRI system. The technique includes a set of rungs or partial faraday shields (PFSs) running parallel to the rungs of the coil. PFSs are placed inside of the rungs which are few mm away from the rungs and optimally placed towards center of the coil. PFSs reduce the E-field significantly and blocks from penetrating the imaging volume and in turn reduces specific absorption rate (SAR).

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LOW ELECTRIC-FIELD (E-FIELD) AND LOW SPECIFIC ABSORPTION RATE (SAR) RADIOFREQUENCY (RF) COIL DESIGN

FIELD OF INVENTION

The invention generally relates to a magnetic resonance imaging (MRI) system and more particularly to a technique to reduce electric-field (E-field) in a volume coil of the MRI system.

BACKGROUND OF THE INVENTION

During MRI scan, a patient becomes warm during scanning due to electric field produced by a radiofrequency (RF) coil. Warming increases with prolonged scan times. A conventional design includes a low-pass (LP) birdcage coil, which includes number of rungs and tuning capacitors placed along the rungs.  In the coil the value of the capacitor is very small and produces very high electric (E)-field in the coil and imaging volume. High E-field in turn produces very high level of specific absorption rate (SAR), which adds to patient warming and discomfort.

Hence there exists a need for an efficient technique to reduce E-field in the volume coil without affecting RF performance and image quality.

BRIEF DESCRIPTION OF THE INVENTION

The invention includes a technique to reduce E-field in a low-pass (LP) birdcage coil without affecting RF performance and image quality in a MRI system. The technique includes a set of rungs or partial faraday shields (PFS) running parallel to the rungs of the coil.

DETAILED DESCRIPTION OF THE INVENTION

The invention includes a technique to reduce E-field in a low-pass (LP) birdcage coil without affecting RF performance and image quality in a magnetic resonance imaging (MRI) system. The technique includes a set of rungs or partial faraday shields (PFS) running parallel to the rungs of the coil.  FIG. 1 depicts PFS running parallel to the rungs of the coil.

FIG.  1

PFS are placed inside of the rungs, which is few millimeter (mm) away from the rungs and optimally placed towards center of the coil. PFSs reduce the E-field significantly and block from penetrating the...