Siemens Healthcare Gmbh

Siemens Healthineers Ag

University College Cardiff Consultants Limited

University of Glasgow

Patrick Liebig

David Grodzki

Peter Speier

Dieter Ritter

Rainer Schneider

Robin Heidemann

Rene Gumbrecht

Yi-Cheng Hsu

Armin Nagel

Jürgen Herrler

Ying Hua Chu

Ralph Kimmlingen

David Andrew Porter

Christian Eisen

Kevin Murphy

Joseph Whittaker

Fabrizio Fasano

Tom Hilbert

A method for providing magnetic field data includes receiving image data as input data of a trained function, and applying the trained function to the image data. The trained function is trained based on a data fidelity of image data corrected using the magnetic field data, and based on at least one assumption about at least one attribute of the magnetic field data. The method includes providing the magnetic field data as output data of the trained function.

Trained function for providing magnetic field data, and the application of the trained function

The disclosure relates to a method for operating a magnetic resonance apparatus, to a magnetic resonance apparatus, and to a computer program product. According to the method, a pre-measurement is carried out by the magnetic resonance apparatus, wherein carrying out the pre-measurement includes acquiring pre-measurement data for the object under examination. The pre-measurement data is evaluated to ascertain evaluation information. The evaluation information is used to determine whether a B1 field map needs to be measured.

Method for operating a magnetic resonance apparatus, magnetic resonance apparatus and computer program product

A method and device for radio-frequency field inhomogeneity correction in magnetic resonance imaging. The method includes: obtaining a first MR image by scanning a target tissue using a first pulse sequence; obtaining a Bfield map of the target tissue; obtaining a B: field map of the target tissue based on the first MR image and the Bfield map; and performing B1 field inhomogeneity correction on a second MR image of the target tissue based on the Bfield map and the Bfield map, where the second MR image is an MR image obtained after scanning of the target tissue using any imaging protocol and any pulse sequence.

Radio-frequency field inhomogeneity correction in magnetic resonance imaging

Movement detection of at least one part of a subject located inside a magnetic resonance imaging (MRI) device is provided. A method includes performing an MR scan by executing a programmable MR sequence protocol. The sequence protocol includes MR excitation pulses to be transmitted via a parallel transmit system and receive time windows for receiving magnetic resonance signals via a receive system. The MR sequence protocol includes, in between the MR excitation pulses, the generation of multi-channel pilot tone signals that are transmitted via the parallel transmit system and an RF transmit coil array. During transmission of the multi-channel pilot tone signals, the pilot tone signals are received with an RF receive coil array. The received pilot tone signals are forwarded via the receive system to an analyzing unit, and movement of at least one part of the subject is determined by analyzing the received pilot tone signal.

Method and system for detecting movement of at least one part of a subject

In a method for quantitative detection of parameters in MRI, first and second spoiled gradient echo images and at least one multi-echo steady-state first/second magnetization image are acquired; based on the extended phase graph theory, signal equations are obtained corresponding to the first and second spoiled gradient echo images, the at least one multi-echo steady-state first magnetization image and the at least one multi-echo steady-state second magnetization image; based on the signal equations of the first and second spoiled gradient echo images, the signal equation of the at least one multi-echo steady-state first magnetization image and the signal equation of the at least one multi-echo steady-state second magnetization image, a spoiled gradient echo proton density map, a multi-echo steady-state proton density map, a longitudinal relaxation time map and a transverse relaxation time map of the target tissue are obtained.

Method and apparatus for quantitative detection of parameters in MRI, and magnetic resonance scanner

In a method for monitoring absorption of a transmitter output irradiated into a patient by a transmitter unit of a magnetic resonance device, absorption data is provided, which describes a patient-nonspecific, location-dependent absorption sensitivity of the transmitter output to be irradiated. The patient is positioned in an irradiation region of the magnetic resonance device, in which the irradiation of the transmitter output into the patient is to take place. An anatomy of the patient is detected in the irradiation region, and the absorption data is assigned to the anatomy of the patient. A magnetic resonance scan of the patient is then performed, wherein the transmitter output absorbed by the patient is monitored during the magnetic resonance scan based on the absorption data assigned to the anatomy of the patient.

Method for monitoring absorption, magnetic resonance device and computer program product

Nuclear spins are excited in a region of interest in an object under examination by a radio-frequency pulse. During at least one phase of the radio-frequency pulse, excitation fields are transmitted while magnetic field gradients are simultaneously applied so that the magnetization of the nuclear spins moves on a trajectory through a transmission k-space. In a first phase of the at least one phase of the radio-frequency pulse, the trajectory moves at a radial distance around the center of the transmission k-space. The radial distance corresponds to the radius of a sphere superimposed with at least one radial harmonic.

Method for exciting nuclear spins

The disclosure is directed to an Echo-Planar-Imaging (EPI) magnetic resonance imaging techniques combined with a variable-density undersampling scheme. The technique comprises generating an RF pulse, applying a switched frequency-encoding read out gradient in a variable time interval, and applying simultaneously an intermittently blipped low-magnitude phase-encoding gradient with a variable value of an integral of the phase-encoding gradient. The aforementioned steps are carried out such that the k-space is at least partially undersampled and the time interval of one read out gradient is varied depending on the integral of the phase encoding gradient, such that a ratio between the variable time interval of the read out gradient and the integral of the corresponding phase encoding gradient is kept above or at a predetermined constant value, which is related to a predetermined criteria of image quality.

Echo-spacing shuffling for echo-planar-imaging

In a method for control, input magnetic field map data is received. In this case, the input magnetic field map data for at least one magnetic field type in each case describes a magnetic field map for a state that an examination object is in at an initial location in the MR apparatus. In this case, the estimated magnetic field map data for at least one magnetic field type in each case describes at least one magnetic field map for in each case a state that the examination object is in at an alternative location that is different compared to the initial location. Control data is determined by the system control unit, using the estimated magnetic field map data or using the input magnetic field map data and the estimated magnetic field map data. The control data is suitable for controlling the MR apparatus.

Method for controlling an MR apparatus

The disclosure relates to techniques for perming chemical exchange saturation transfer (CEST) imaging correction. The present disclosure improves the speed of correcting CEST images.

B0 and B1 correction anti-respectively

A pulse-design unit for creating pulse data for controlling a magnetic resonance system includes a data interface configured for receiving an examination scheme, and a calculation module configured for generating pulse data based on an examination scheme. The pulse-design unit includes a data grid and/or parameter values created from map pairs of a plurality of patients and is configured to select and/or calculate pulse data using the data grid and/or parameter values and a provided examination scheme. A method and a control device for controlling a magnetic resonance imaging (MRI) system and a related magnetic resonance imaging system are also provided.

Method and device for controlling a magnetic resonance imaging system

A computer-implemented method is disclosed for providing an actuation sequence which specifies transmit signals for at least one high-frequency transmit channel of an antenna arrangement of a magnetic resonance device for acquiring measurement data of an object under investigation by the magnetic resonance device. The method includes providing different actuation sequences, wherein each sequence is the result of an optimization method and which differs with regard to the value of an optimization parameter taken into account in the course of the optimization method. The method further includes providing a plurality of field distribution maps, (e.g., at least one Bmap and/or at least one Bmap), acquired by the or a further magnetic resonance device from the object under investigation. The method further includes selecting the actuation sequence to be used from the different actuation sequences depending on the field distribution maps and providing the actuation sequence to be used.

Computer-implemented method for providing an actuation sequence and method for acquiring measurement data by a magnetic resonance device

In a method for readout segmented magnetic resonance imaging (MRI) of an examination object, k-space is acquired in a plurality of segments along a readout direction using a parallel imaging (PI) technique. K-space in a first segment is acquired with a first acceleration factor, and k-space in a second segment is acquired with a second acceleration factor different from the first acceleration factor.

Systems and methods for segment-specific data acquisition in readout-segmented magnetic resonance imaging

Techniques are disclosed for recording magnetic resonance data with a magnetic resonance facility, wherein a three-dimensional echo-planar imaging sequence is used whereby following a single excitation period (e.g. 'module') in an echo train, an echo count of k-space rows is read out in a read-out direction in the k-space, and interchanging takes place between these rows by means of gradient pulses of the two phase encoding directions.

Method for recording magnetic resonance data, magnetic resonance facility, computer program and electronically readable data carrier

A method for obtaining magnetic resonance imaging (MRI) echo-planar image (EPI) data, including providing a homogeneous, static background field; providing a gradient field to select a slice of an object for imaging; applying Radio-frequency (RF) pulses to excite magnetic resonance in the selected slice; and measuring a radio frequency signal emitted by the selected slice containing image data. The RF pulses are repeatedly applied separated by a time period shorter than a recovery time of static material in the selected slice such that the static material remains in a state of magnetic saturation, while dynamic material arriving within the slice since a previous RF pulse is not magnetically saturated.

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Erlangen, Germany

Patrick Liebig