Universitaetsklinikum Freiburg

Albert-ludwigs-universitat Freiburg

Albert-ludwigs-universitaet Freiburg

University of Hawai'i

The Queen's Medical Center

Siemens Healthcare Gmbh

Forschungszentrum Julich Gmbh

Bruker Biospin Mri Gmbh

Forschungszentrum J&uuml;lich Gmbh

Universitätsklinikum Freiburg

Baden-wurttemberg Stiftung Ggmbh

Maxim Zaitsev

Juergen Hennig

Jürgen Hennig

Gerrit Schultz

Daniel Gallichan

Tobias Kober

Florian Schneider

Guobin Li

Thomas Michael Ernst

Michael Herbst

Brian Keating

Walter Witschey

Julian Maclaren

Sebastian Littin

Aditya Singh

Hans Weber

Martin Haas

Nadim Joni Shah

Daniel Nicolas Splitthoff

Jurgen Hennig

Peter Ullmann

Martin O Leach

Wolfgang Ruhm

Oliver Speck

N Joni Shah

Ulrike Wallrabe

Sven Steinhoff

Kuan Jin Lee

Feng Jia

Anna Welz

David John Collins

James D'Arcy

Ilia Kadachevitch

Xiang Gao

Crispin Lovell-Smith

Niklas Wehkamp

Philipp Rovedo

Julius Dragonu

Matthias Weigel

Huijun Yu

Daniel N Splitthoff

Philipp Amrein

Matthias Christian Wapler

Dominik Von Elverfeldt

A magnetic field probe () having a capsule (), in which an MR-active substance () is encapsulated. Two coils () are preferably arranged in the capsule (). Advantageous production methods for magnetic field probes () are also described, as well as advantageous uses of the magnetic field probe () and methods in which magnetic field probes () of this kind and arrangements of magnetic field probes () are used.

Magnetic field probe with encapsulated MR-active substance

Improvements in MR spiral imaging are provided in that spiral segments (to) are reordered, in particular alternately traversed and/or permuted. Moreover, repeatedly approaching the same post-trajectory points () between the acquisitions of the spiral segments (to) is provided, in which the post-trajectory points () are located outside of the center () of k-space (), preferably outside of a region () of the k-space () covered by the spiral segments (to).

Magnetic resonance imaging method

A method is used to carry out a magnetic resonance measurement with at least one echo train with n spin echoes and prospective movement correction. Movement correction data for each echo train is updated at the start of the echo train and is then updated again at most partially for the spin echoes.

Magnetic resonance measurement with prospective movement correction

The systems, methods, and devices described herein generally relate to achieving accurate and robust motion correction by detecting and accounting for false movements in motion correction systems used in conjunction with medical imaging and/or therapeutic systems. In other words, in some embodiments of the systems, methods, and devices described herein can be configured to detect false movements for motion correction during a medical imaging scan and/or therapeutic procedure, and thereby ensure that such false movements are not accounted for in the motion correction process. Upon detection of false movements, the imaging or therapeutic system can be configured to transiently suppress and/or subsequently repeat acquisitions.

Systems, devices, and methods for detecting false movements for motion correction during a medical imaging scan

A method for accelerating magnetic resonance imaging is proposed. In 3D MRI, the method utilizes two sub-echo-trains in each repetition time for the simultaneous acquisition of two contrasts. The first sub-echo-train is a turbo spin echo train and the second sub-echo-train is a gradient echo train. The method acquires two different contrasts simultaneously in a single acquisition, for example one water image plus one fat image, or one turbo spin echo image plus one susceptibility weighted image.

MRI method of hybrid acquisition in 3D TSE

A carrier structure () of an arrangement () for modifying a main magnetic field generated in a magnetic resonance tomograph from multiple carrier elements (). A conductor arrangement () is respectively arranged on each carrier element (). The conductor arrangements () respectively include a primary conductor arrangement () for generating a primary magnetic field that modifies the main magnetic field and a secondary conductor arrangement () for shielding the primary magnetic field. A method for producing a modularly constructible arrangement () is provided, which can be used for example for spatial encoding.

Arrangement for modifying a main magnetic field and method for producing such an arrangement

A multi-channel switching system () for an MRI gradient coil system is characterized in that the number of channels controlled by the power amplifiers is smaller than the number of switches and the number of channels controlled by the power amplifiers is smaller than the number of coil elements in the coil system. Current in each of the coil elements can be switched to flow in either a positive or negative direction or to bypass the respective coil element and power to the switch elements is delivered via a smaller amount of power lines using a power distribution system providing floating power to each of the switches. This allows to electrically connect matrix coil elements dynamically within a pulse sequence to generate dynamically switched magnetic field profiles and therefore reduce the number of gradient power amplifiers, gradient cables and power supplies needed.

Multi-channel switching system for MRI matrix gradient coils

A device and a method for calibrating the coordinate system of imaging systems having a tracking system prior or during image data acquisition, e.g. by way of magnetic resonance tomography.

Device and method for calibrating tracking systems in imaging systems

A method of MRI for reduction of motion artifacts in 3D MR data acquisition with multiple segments comprises: the complete acquisition being divided into two parts: basic acquisition and complementary acquisition. Basic acquisition is performed at the beginning. Complementary acquisition is performed after the basic acquisition is finished. View Reordering is prepared for basic acquisition and complementary acquisition separately. Motion monitoring is performed regularly during the data acquisition. Whenever motion is detected, data acquisition stops. Image reconstruction is performed when motion occurs in the phase of complementary acquisition. The final reconstructed image is free of motion artifacts.

Method for improving robustness of 3D magnetic resonance imaging to involuntary motion

A method of MRI entails recording and storing MR signals from an object to produce an old set of data. A further measurement of the object is then initiated at a later time to record new MR data, whereby k-space is undersampled in the further measurement. The old data are corrected for changes in the new position of the object, for changes in the sensitivity and exact spatial positioning of the receiver coils as well as for changes in the actual field shimming. The old and new data are then combined to create a new, high resolution image of the object.

Method and apparatus for accelerating magnetic resonance imaging

A method is presented for accelerating magnetic resonance imaging. In 3D MRI, the k-space in the phase encoding plane is divided into two symmetric parts and three asymmetric parts. Different sampling densities are applied in different parts. Images are reconstructed by iteratively minimizing a cost function when random sampling is applied in each part. A phase constraint term is added into the cost function to improve the quality of the reconstruction by exploiting the conjugate symmetry of k-space.

Method for accelerating magnetic resonance imaging using varying k-space sampling density and phase-constrained reconstruction

A method to compensate for the magnetic field heterogeneity inside an object of investigation in a MR device obtains an uncorrected magnetic field distribution of the object and executes an MR sequence with a desired k-space coverage by applying RF pulses to generate a transverse magnetization within the object. MR signal data is recorded, magnetic field shimming parameters are dynamically updated and MR signal data are reconstructed to produce images or localized spectroscopic data. Artifacts in a reconstructed image resulting from an uncorrected magnetic field distribution are suppressed by temporally separating MR signals originating from at least two different sub-volumes within a volume of transverse magnetization by generating a nonlinear phase distribution within the object and by dynamically updating shimming parameters to compensate for the field inhomogeneity distributions within the different sub-volumes in the volume of transverse magnetization.

Method of dynamically compensating for magnetic field heterogeneity in magnetic resonance imaging

A method of MR imaging and spectroscopy to reduce artifacts occurring due to the motion of an object to be represented, wherein the object position is determined quasi-continuously during the runtime of the MR acquisition, which includes one or more partial acquisitions (TA), and wherein motion correction is performed, which comprises dynamic adaptation of the frequency and phase settings of the RF system of the tomograph and of the orientation and amplitudes of the gradients during the runtime of the MR acquisition according to the current object position. The motion correction is thereby applied during a signal weighting period, during a signal read-out period, or between and/or during the two stated periods and the adaptations for motion correction are performed without interrupting or slowing the temporal progression of the MR acquisition. In this way, artifacts due to motion of the object to be represented can be further reduced.

Method for quasi-continuous dynamic motion correction in magnetic resonance measurements

A method of MR imaging applies a magnetic field Bhaving a spatially non-linear dependence to select a volume of at least one curved slice. The slice is described by its midsurface A, a volume of the selected slice being made up of n&#x3bd; partial volumes in each of which gradients of at least one pair of remaining superimposed magnetic fields B(i&#x3e;1) exhibit an angle dependence of 70&#xb0; to 110&#xb0; with respect to one another and with respect to the normal of the midsurface A. At least one superimposed magnetic field of the respective pair exhibits a spatially non-linear dependence and combinations of these pairs are used for spatial encoding. In this way, curved surfaces can be mapped efficiently in high resolution and the method can be adapted to the slice shape.

Method of magnetic resonance imaging for the selection and recording of curved slices

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Freiburg, Germany

Maxim Zaitsev