General Electric Company

Ge Medical Systems Global Technology Company, LLC

Richard Philip Mallozzi

Charles L Dumoulin

William A Edelstein

Harvey E Cline

Robert David Darrow

Eddy Benjamin Boskamp

Sayed-Amr A El-Hamamsy

Robert Adolph Ackermann

Robert Arvin Hedeen

Paul Shadforth Thompson

Ileana Hancu

Robert Michael Vavrek

David E Dean

Mark Lloyd Miller

Scott Thomas Mansell

Bruce Campbell Amm

Dewain Anthony Purgill

John Peter Fura

Mike James Radziun

Renee Guhde

An apparatus and method for correcting magnetic resonance temperature measurements is disclosed. In one aspect, the method identifies monitoring regions of interest outside a therapeutic region of interest. Next, a pulse sequence sensitive to changes in Tand proton density is used to measure the temperature changes in these regions. Next, the PRFS is measured in these same regions. The PRFS in these regions will be caused both by the desired shift from temperature change, and the undesired shift from background magnetic field changes. Using the measured temperature changes from the T-method, the component of the PRFS due to actual temperature changes is subtracted from the PRFS method, leaving only the component caused by the unwanted magnetic field changes. This analysis is performed separately for each region. At the end of this step, one has measured the change in background magnetic field within each region.

T1-corrected proton resonance frequency shift thermometry

A method and system for imaging using labeled contrast agents and a magnetic resonance imaging (MRI) scanner are provided. The method comprises performing a prescan at a frequency selected to be substantially similar to a frequency of the labeled contrast agent and performing an examination scan at the frequency of the labeled contrast agent substantially immediately after administering the labeled contrast agent to a subject.

Method and system for magnetic resonance imaging using labeled contrast agents

An imaging and interventional system and methods are provided. The system comprises an imaging device for acquiring volumetric image data for an anatomical region of interest, a catheter for acquiring electrophysiological (EP) measurements of the anatomical region of interest, the catheter having at least one tracking coil for detecting signals indicative of a position of the catheter, and, a processor coupled to the catheter for receiving the EP measurements and signals indicative of the position of the catheter. The position of the catheter and EP measurements are combined and superimposed on a resultant image. The method comprises acquiring volumetric image data for an anatomical region of interest, acquiring position data for a catheter inserted in the region of interest, obtaining electrophysiological (EP) measurements for the region of interest and combining the image data, position data and EP measurements into a resultant image for use in the interventional procedure.

System and method for interventional procedures using MRI

A system and method for active MR tracking includes a magnetic resonance imaging (MRI) system having a plurality of gradient coils positioned about a bore of a magnet, an RF coil assembly positioned in the bore, and a pulse module. The MRI system also includes a polarization reversal switch controlled by the pulse module to transmit RF signals to the RF coil assembly coupled to the polarization reversal switch and an RF switch controlled by the pulse module to transmit the RF signals to the polarization reversal switch.

System and method for active MR tracking

A technique is disclosed for shielding rf magnetic fields in MRI systems. An rf shield is embedded in a gradient coil structure including X-, Y- and Z-axis coils. The rf shield is positioned between an inner gradient coil which is inherently decoupled from the rf field, and the remaining coils which require rf shielding. The inner gradient coil may be a Z-axis coil wound as a solenoid, the field of which is generally orthogonal with respect to the rf magnetic field. The rf shield is thereby placed at an enhanced distance from the rf coil, providing greater efficiency and permitting energy levels to be reduced to obtain the desired rf magnetic field strength.

rf shielding method and apparatus

A low noise imaging apparatus for producing Magnetic Resonance (MR) images of a subject and for substantially minimizing acoustic noise generated during imaging is provided. The imaging apparatus comprises a magnet assembly, a gradient coil assembly, and a rf coil assembly, wherein at least one of the magnet assembly, the gradient coil assembly and the rf coil assembly are configured to reduce the generation and transmission of acoustic noise.

Low noise MRI scanner

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Ballston Lake, NY, United States of America

Richard Philip Mallozzi