University of Minnesota

Gregor Adriany

Kamil Ugurbil

J Thomas Vaughan, Jr

Pierre-Francois Van De Moortele

Djaudat S Idiyatullin

Carl J Snyder

Lance DelaBarre

Can E Akgun

Jinfeng Tian

John Strupp

Peter M Andersen

Donald Robert Nixdorf

Gregory F Molnar

Michael G Garwood

Steen Moeller

John Thomas Vaughan

Anand Gopinath

Heather Diane Orser

Peter M Anderson

Curt Corum

J Thomas Vaughan

Xiaoping Wu

Noam Harel

Johannes Ritter

William Voje

Ali Caglar Ozen

Myung Kyun Woo

Russell L Lagore

Jerahmie Radder

Yigitcan Eryaman

Chris E Olson

Jr J Thomas Vaughan

Lance Delabarre

Chris Olson

Peter Andersen

An antenna apparatus for a radio frequency (RF) coil to transmit signals to and to receive signal from a subject in a magnetic resonance imaging (MRI) system includes a distal surface facing away from the subject, a proximal surface facing towards the subject, a high permittivity material (HPM) having a shape, and an antenna coupled to the HPM and positioned on the proximal surface such that the antenna is positioned between the HPM and the subject.

Antenna apparatus including high permittivity materials (HPM) for radio frequency (RF) coils

A multi-planar intraoral radio frequency (RF) coil apparatus for use in a magnetic resonance imaging system can include a housing having a shape configured to be positioned in an occlusal plane between an upper jaw and a lower jaw of a subject and a plurality of coil elements disposed within the housing. The plurality of coil elements includes a first coil element positioned in a first plane and a second coil element positioned in a second plane different from the first plane and substantially parallel to the first plane. The coil elements can be loop coil elements or dipole coil elements.

Multi-planar intraoral RF coil for magnetic resonance imaging

Systems and method for measuring and mitigating radio frequency ('RF') induced currents on electrical leads, electrodes, and other electrically conductive objects present in the bore of a magnetic resonance imaging ('MRI') scanner when the MRI scanner is operated to image an object or subject are described. The methods described in the present disclosure can be implemented as a pre-scan procedure to obtain images from which the current induced on the electrical lead can be estimated. This information can then be used to adjust the RF excitation used in a subsequent pulse sequence to mitigate induced currents and reduce heating in the lead. As such, the methods described in the present disclosure provide for improved patient safety.

Methods for measuring induced currents on electrical leads and electrodes in magnetic resonance imaging

A magnetic resonance system is disclosed. The system includes a transceiver having a multichannel receiver and a multichannel transmitter, where each channel of the transmitter is configured for independent selection of frequency, phase, time, space, and magnitude, and each channel of the receiver is configured for independent selection of space, time, frequency, phase and gain. The system also includes a magnetic resonance coil having a plurality of current elements, with each element coupled in one to one relation with a channel of the receiver and a channel of the transmitter. The system further includes a processor coupled to the transceiver, such that the processor is configured to execute instructions to control a current in each element and to perform a non-linear algorithm to shim the coil.

High field magnetic resonance

A system and method for producing an image using a radio frequency (RF) coil in a magnetic resonance imaging system (MRI). A static magnetic field (B) extends across a first and second region of interest (ROI). A local radio frequency (RF) coil, shaped like a dental arch, is positioned proximate to the ROIs, the ROIs being the upper and lower jaw of a subject. The RF coil and the subject are oriented in the static magnetic field (B) to align an axis extending through a loop of the coil with the Bdirection of the static magnetic field extending across the ROIs. A pulse sequence is then performed with the MRI system and the RF coil to acquire imaging data from the ROIs simultaneously while using a transverse component of an excitation field (B). The image data is reconstructed to create an image of the ROIs.

System and method for multi-ROI MRI imaging using an RF loop coil

An apparatus comprises a radio frequency magnetic field unit to generate a desired magnetic field. In one embodiment, the radio frequency magnetic field unit includes a first aperture that is substantially unobstructed and a second aperture contiguous to the first aperture. In an alternative embodiment, the radio frequency magnetic field unit includes a first side aperture, a second side aperture and one or more end apertures. In one embodiment of a method, a current element is removed from a radio frequency magnetic field unit to form a magnetic field unit having an aperture. In an alternative embodiment, two current elements located opposite from one another in a radio frequency magnetic field unit are removed to form a magnetic filed unit having a first side aperture and a second side aperture.

Assymetric radio frequency magnetic line array

A current unit having two or more current paths allows control of magnitude, phase, time, frequency and position of each of element in a radio frequency coil. For each current element, the current can be adjusted as to a phase angle, frequency and magnitude. Multiple current paths of a current unit can be used for targeting multiple spatial domains or strategic combinations of the fields generated/detected by combination of elements for targeting a single domain in magnitude, phase, time, space and frequency.

Multi-current elements for magnetic resonance radio frequency coils

A plurality of linear current elements are configured about a specimen to be imaged. A current in each current element is controlled independent of a current in other current elements to select a gradient and to provide radio frequency shimming. Each current element is driven by a separate channel of a transmitter and connected to a separate channel of a multi-channel receiver. The impedance, and therefore, the current, in each current element is controlled mechanically or electrically.

Radio frequency gradient, shim and parallel imaging coil

This document discusses, among other things, a system and method for a coil having a plurality of resonant elements and an adjustable frame. A position of at least one resonant element can be adjusted relative to at least one other resonant element. A variable impedance is coupled to adjacent resonant elements and the impedance varies as a function of a separation distance. Cables are coupled to each resonant element and are gathered at a junction in a particular manner.

Spatially reconfigurable magnetic resonance coil

An excitation and detection circuit having individually controllable elements for use with a multi-element radio frequency coil. Characteristics of the driving signal, including, for example, the phase, amplitude, frequency and timing, from each element of the circuit is separately controllable using small signals. Negative feedback for the driving signal associated with each coil element is derived from a receiver coupled to that coil element.

Parallel transceiver for nuclear magnetic resonance system

Assymetric radio frequency transmission line array

Radio frequency magnetic field unit with aperature

Growing community of inventors

Minneapolis, MN, United States of America

Gregor Adriany