Abstract: A method for acquiring a magnetic resonance image dataset of an object includes using an imaging protocol in which a number of k-space lines are acquired in one shot. The imaging protocol includes a plurality of shots. A plurality of additional k-space lines are acquired in at least a subset of the shots, such that movement of the object is detected throughout the imaging protocol. A method for generating a motion-corrected magnetic resonance image dataset from the dataset thus acquired, a magnetic resonance imaging apparatus, and a computer program are also provided.

Abstract: A method for reconstructing a motion-corrected magnetic resonance image of a subject.

Abstract: A method for generating a motion-corrected MR image dataset of a subject includes: acquiring k-space data of an MR image of a subject in an imaging sequence; acquiring at least two low-resolution scout images of the subject interleaved with the k-space data of the imaging sequence; comparing the scout images with one another in order to detect and/or to estimate subject motion between the scout images; and reconstructing a motion-corrected MR image dataset from the k-space data acquired in the imaging sequence. The reconstruction process includes: estimating the motion trajectory of the subject by comparing the k-space data with at least one of the low-resolution scout images; and estimating the motion-corrected image dataset using the estimated motion trajectory, wherein the estimations involve minimizing the data consistency error between the acquired k-space data and a forward model described by an encoding operator.

Abstract: A method for generating a motion-corrected magnetic resonance image dataset of a body region of a subject, the method comprising receiving magnetic resonance data acquired of the body region; receiving information on the body region covered by the magnetic resonance image dataset; weighting at least part of the received magnetic resonance data by reducing the signal originating from parts of the body region that are expected to have undergone non-rigid and/or independent motion during the acquisition, thereby producing weighted magnetic resonance data; and estimating the motion-corrected image dataset by minimizing the data consistency error between the magnetic resonance data acquired in the imaging protocol and a forward model described by an encoding matrix, wherein the encoding matrix includes motion parameters, Fourier encoding, and optionally subsampling and/or coil sensitivities of a multi-channel coil array, wherein the estimation includes at least one step of estimating motion parameters from the wei

Abstract: A method for acquiring a magnetic resonance image dataset of an object includes using an imaging protocol in which a number of k-space lines are acquired in one shot. The imaging protocol includes a plurality of shots. A plurality of additional k-space lines are acquired in at least a subset of the shots, such that movement of the object is detected throughout the imaging protocol. A method for generating a motion-corrected magnetic resonance image dataset from the dataset thus acquired, a magnetic resonance imaging apparatus, and a computer program are also provided.

Abstract: The disclosure relates to receiving a provisioning request for providing a magnetic resonance tomography (MRT) image of a geometric image region of an object, wherein the provisioning request comprises a specification relating to at least one feature that is to be matched between an MRT reference image of the image region and the MRT image. A control unit is configured to actuate and control an MRT apparatus according to the specification in accordance with a predefined measurement technique to conduct a predefined MRT measurement at least on the geometric image region of the object, and to receive an MRT dataset generated in the measurement. The control unit is configured to provide the MRT image of the geometric image region of the object according to the specification from the MRT dataset in accordance with a predefined exporting method.

Abstract: A method is provided for acquiring a magnetic resonance image dataset of an object, using an imaging protocol in which several k-space lines are acquired in one echo train, wherein the echo train may include one or several sub echo trains, and wherein the imaging protocol includes a plurality of echo trains. Within the method, a set of additional k-space lines within a central region of k-space is acquired a number of times per echo train, wherein the number is greater than 1, in order to detect movement of the object during the echo train. The sets of additional k-space lines are acquired at pre-determined positions within the echo trains. The disclosure is also directed to a method for generating a motion-corrected magnetic resonance image dataset from the dataset thus acquired, a magnetic resonance imaging apparatus, and a computer program.

Abstract: A motion estimation method and apparatus for magnetic resonance imaging and a magnetic resonance imaging system. The method includes: calculating a rigid body motion vector of a subject for each of a most recent N imaging excitations; according to pilot tone (PT) data of each channel acquired for the most recent N imaging excitations and N rigid body motion vectors calculated for the most recent N imaging excitations, calculating a linear transformation model for transforming from the PT data of each channel acquired for the most recent N imaging excitations to the N rigid body motion vectors; and for each subsequent imaging excitation, according to PT data of each channel acquired during an echo duration of each echo and the linear transformation model, calculating a rigid body motion vector of the subject for each echo of each imaging excitation.

Abstract: A computer-implemented method for providing a final motion corrected image dataset includes: receiving magnetic resonance data; determining a first motion corrected image dataset by solving a first optimization problem, wherein the first optimization problem depends on the magnetic resonance data and on motion data, and wherein the motion data concerns a movement of an object during the acquisition of the magnetic resonance data; processing the first motion corrected image dataset by an algorithm for image quality improvement to provide a processed image dataset; determining a second motion corrected image dataset by solving a second optimization problem that depends on the magnetic resonance data, on the motion data and on the processed image dataset, and either providing the second motion corrected image dataset as the final motion corrected image dataset or determining the provided final motion corrected image dataset based on the second motion corrected image dataset.

Abstract: A method for acquiring a magnetic resonance image dataset of a body part of a subject includes acquiring a low-resolution magnetic resonance image of the body part, optionally acquiring a reference set of additional k-space lines within a central region of k-space, and acquiring further sets of additional k-space lines within a central region of k-space at intervals throughout the imaging protocol. The method includes applying a trained machine learning model to a dataset including the low-resolution image in k-space notation and a further set of additional k-space lines. A set of pose parameters is generated. The pose parameters are used for prospective and/or retrospective motion correction of the magnetic resonance image dataset.

Abstract: A method for acquiring a magnetic resonance image dataset of a field-of-view using a gradient-echo imaging protocol includes acquiring additional k-space lines within a central region of k-space at intervals throughout the imaging protocol, wherein the additional k-space lines are used for estimating motion parameters of the field-of-view. The imaging protocol has been amended by inserting additional gradient blips after at least some of the RF excitations, such that at least one additional gradient echo is generated, allowing the acquisition of at least one additional k-space line during one echo time.

Abstract: The disclosure relates to a method for correcting a movement of an object occurring during an MR image acquisition. The method includes: determining a motion model describing possible movements of the object based on a defined number of degrees of freedom; detecting a motion of a marker provided on the object with a motion sensor; determining a description of the motion model in a common coordinate system; determining the motion of the marker in the common coordinate system; determining a first motion of the object in the common coordinate system using the description of the motion model, the first motion being the motion that best matches the determined motion of the marker in the common coordinate system using the defined number of degrees of freedom; and correcting the movement of the object based on the determined first motion in order to determine at least one motion corrected MR image.

Abstract: A method for acquiring a magnetic resonance image dataset of a field-of-view using an imaging protocol includes acquiring a low-resolution scout image dataset of the field-of-view, and sets of one or more additional k-space lines within a central region of k-space at regular intervals during the imaging protocol. A contrast of the low-resolution scout image dataset and a contrast of the sets of one or more additional k-space lines are matched and are independent of a contrast of the magnetic resonance image dataset. The low-resolution scout image dataset and the sets of one or more additional k-space lines are acquired after an at least approximately matched magnetization preparation and matched recovery times.

Abstract: A method for reconstructing a motion-corrected magnetic resonance image of a subject includes providing k-space magnetic resonance data including a plurality of shots, wherein each shot corresponds to an individual motion state of the subject. The method further includes providing motion parameters related to each motion state, determining redundancies across the motion states of the plurality of shots based on the motion parameters, compressing the plurality of motion states based on the determined redundancies across the motion states, and reconstructing the magnetic resonance image from the k-space magnetic resonance data based on the compressed plurality of motion states.

Abstract: A movement detection method is calibrated for a magnetic resonance apparatus. An examination object is positioned on a movement apparatus. During a training phase, training data is recorded according to the movement detection method, wherein the examination object is simultaneously moved by the movement apparatus. The movement detection method is calibrated on the basis of the training data.

Abstract: A method for generating a motion-corrected MR image dataset of a subject includes: acquiring k-space data of an MR image of a subject in an imaging sequence; acquiring at least two low-resolution scout images of the subject interleaved with the k-space data of the imaging sequence; comparing the scout images with one another in order to detect and/or to estimate subject motion between the scout images; and reconstructing a motion-corrected MR image dataset from the k-space data acquired in the imaging sequence. The reconstruction process includes: estimating the motion trajectory of the subject by comparing the k-space data with at least one of the low-resolution scout images; and estimating the motion-corrected image dataset using the estimated motion trajectory, wherein the estimations involve minimizing the data consistency error between the acquired k-space data and a forward model described by an encoding operator.

Abstract: A method is provided for acquiring a magnetic resonance image dataset of an object, using an imaging protocol in which several k-space lines are acquired in one echo train, wherein the echo train may include one or several sub echo trains, and wherein the imaging protocol includes a plurality of echo trains. Within the method, a set of additional k-space lines within a central region of k-space is acquired a number of times per echo train, wherein the number is greater than 1, in order to detect movement of the object during the echo train. The sets of additional k-space lines are acquired at pre-determined positions within the echo trains. The disclosure is also directed to a method for generating a motion-corrected magnetic resonance image dataset from the dataset thus acquired, a magnetic resonance imaging apparatus, and a computer program.

Abstract: The disclosure relates to receiving a provisioning request for providing a magnetic resonance tomography (MRT) image of a geometric image region of an object, wherein the provisioning request comprises a specification relating to at least one feature that is to be matched between an MRT reference image of the image region and the MRT image. A control unit is configured to actuate and control an MRT apparatus according to the specification in accordance with a predefined measurement technique to conduct a predefined MRT measurement at least on the geometric image region of the object, and to receive an MRT dataset generated in the measurement. The control unit is configured to provide the MRT image of the geometric image region of the object according to the specification from the MRT dataset in accordance with a predefined exporting method.

Abstract: Techniques are described for detecting a specified substance in an examination object by way of a magnetic resonance apparatus. A controller ascertains a magnetic resonance sequence comprising at least one sub-sequence for detecting at least one substance to be detected in the examination object as a function of the at least one substance to be detected, and ascertains at least one measuring instant for capturing a respective MRT signal to detect the at least one substance to be detected in the examination object as a function of the at least one substance to be detected. The at least one MRT signal is evaluated for fulfillment of a predetermined detection condition, and a presence of the at least one substance to be detected is established when the at least one MRT signal fulfils the predetermined detection condition.

Abstract: A method for acquiring a magnetic resonance image dataset of an object includes using an imaging protocol in which a number of k-space lines are acquired in one shot. The imaging protocol includes a plurality of shots. A plurality of additional k-space lines are acquired in at least a subset of the shots, such that movement of the object is detected throughout the imaging protocol. A method for generating a motion-corrected magnetic resonance image dataset from the dataset thus acquired, a magnetic resonance imaging apparatus, and a computer program are also provided.