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Universal Interface for MRI Local Coil

IP.com Disclosure Number: IPCOM000127548D
Publication Date: 2005-Aug-31

Publishing Venue

The IP.com Prior Art Database

Related People

Ashok Menon: INVENTOR [+1]

Abstract

A universal interface between local MRI coils and pre-amplifiers decomposes the interface function into standard modules, which may be assembled together, reused and/or individually tailored to particular applications.

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Universal Loop Interface for MRI Local Coil

     Invivo Corporation Publication of Intellectual Property www.ip.com

Date: 08/31/2005 ID#: INVD-016

Publication Title: Universal Loop Interface for MRI Local Coil

Author(s)/Inventor(s): Ashok Menon

Jovan Jevtic Invivo Corporation N27 W23676 Paul Road, Pewaukee, WI 53072 Tel.: 262-524-1402 e-mail: jjevtic@invivocorp.com

Copyright: Invivo Corporation Country of Origin: USA

Document Abstract:

A universal interface between local MRI coils and pre-amplifiers decomposes the interface function into standard modules, which may be assembled together, reused and/or individually tailored to particular applications.

Invivo Corporation August 31, 2005

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Universal Loop Interface for MRI Local Coil

BACKGROUND OF THE INVENTION

    The field of the invention is magnetic resonance imaging, and in particular, electrical interfaces between local coils used in magnetic resonance imaging and image acquisition circuitry.

    Magnetic resonance imaging ("MRI") equipment provides images, for example of a human patient, by detecting faint nuclear magnetic resonance signals from precessing hydrogen protons. The protons are stimulated into precession by a radio frequency excitation signal while they are held in a strong magnetic field (termed the B0 field).

    The quality of image created using MRI is strongly dependent upon the strength of the received nuclear magnetic resonance signal. For this reason, it is known to use radio frequency receiving coils placed in close proximity to the subject being imaged. These coils are called local coils.

    A variety of different local coils are currently manufactured and sold for different imaging techniques and different portions of a patient's anatomy. Generally, different electrical interface circuitry, used to communicate the faint nuclear magnetic resonance signal to the MRI machine and to block the high energy radio frequency stimulation signal, is designed for each coil.

    The burden of this designing multiple interface circuits increases the cost of the local coil and may discourage the development of local coils for less for some applications.

BRIEF SUMMARY OF THE INVENTION

    The present inventor has isolated a set of functions required of a local coil interface and has developed a modular interface circuit wherein each module implements a function and may be separately optimized and reused between coil applications.

    Specifically, the present invention provides a universal local coil interface to be positioned between an MRI local coil and an unbalanced pre-amplifier having four sections which may be connected together in series: (1) a balun section receiving a signal that is balanced at the input terminals and converting the signal to

Invivo Corporation August 31, 2005

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Universal Loop Interface for MRI Local Coil

a signal that is unbalanced at the output terminals; (2) an impedance matching section receiving a signal with a first impedance at input terminal...

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