Case Western Reserve University

Other

Michael Twieg

Mark A Griswold

Soumyajit Mandal

Matthew Riffe

Bhairav Bipin Mehta

Simone Coppo

Systems and methods are provided for acquiring imaging data from one or more resonance species that simultaneously produce individual magnetic resonance signals in a plurality of different slices. The data is acquired by simultaneously exciting, using a pTX RF coil array, a plurality of different slices such that at least some of the plurality of different slices are excited by transmitting RF energy from a subset of transmit channels in the pTX RF coil array. The method also includes comparing the data to a dictionary of signal evolutions to determine quantitative values for two or more parameters of the resonant species based, at least in part, on matching the data to a set of known signal evolutions stored in the dictionary. The method includes producing an image for each of the plurality of different slice locations, at least in part, on the quantitative values.

System and method for simultaneous multi-slice magnetic resonance fingerprinting imaging using a parallel transmit radio frequency coil array

An apparatus, a system, and a chip are provided for improving RF system performance in MRI systems. The apparatus includes a radio-frequency (RF) coil array disposed at least partially in a coil housing, where the RF coil array may include at least one coil configured to receive magnetic resonance (MR) RF signals. The apparatus also includes a mixer disposed in the coil housing and electronically connected to the RF coil array, where the mixer converts MR RF signals from the RF coil array to intermediate-frequency (IF) signals. An electronic amplifier is disposed in the coil housing. The electronic amplifier is electronically connected to the mixer and is configured to amplify IF signals from the mixer to amplified IF signals.

System and method for improved RF system performance in MRI systems

Example systems, apparatus, circuits, and other embodiments described herein concern parallel transmission in MRI. One example apparatus includes at least two enhanced mode gallium nitride (eGaN) based field effect transistors (FETs) that are connected by a coil that includes an LC (inductance-capacitance) leg. The apparatus includes a controller that inputs a signal to the eGaN FETs to control the production of an output analog radio frequency (RF) signal. The LC leg selectively alters the output analog RF signal. The analog RF signal is used in parallel magnetic resonance imaging (MRI) transmission. One embodiment provides an MRI transmit coil with switched-mode current-source amplification provided by a gallium nitride FET.

Magnetic resonance imaging with switched-mode current-source amplifier having gallium nitride field effect transistors for parallel transmission in MRI

Example systems, apparatus, circuits, and other embodiments described herein concern acquiring telemetry data from an MR system and providing the telemetry data via fiber optic cable. One example apparatus includes a telemetry signal acquisition element (e.g., circuit, circuit component) that is configured to acquire a telemetry signal from a component in the MR apparatus. The component may be, for example, a transmit coil or an on-coil amplifier. The example apparatus also includes a fiber optic cable that is configured to carry an output signal from the MR apparatus through a field produced by the MR apparatus. The example apparatus also includes a telemetry signal output element that is configured to produce the output signal from the telemetry signal and to transmit the output signal via the fiber optic cable.

Fiber optic telemetry for switched-mode current-source amplifier in magnetic resonance imaging (MRI)

Example devices, apparatus, and methods concern intervention-independent imaging control for an MRI system. A hand wearable device (e.g., glove) that can be manipulated independently of an interventional device (e.g., catheter) in use to treat a patient transmits position signals describing an orientation of the device to an MRI system. The device may have fiducial markers mounted on an operator's fingers. The MRI system determines a desired scan plane that will correspond to the orientation of the intervention-independent device and performs a diagnostic scan on the desired scan plane. The spatial proximities of the markers may control a switch based control that controls image acquisition parameters including field of view.

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Cleveland, OH, United States of America

Michael Twieg