Abstract: In a method for improving the quality, particularly the signal-to-noise ratio, of an image, first image data are subjected to a mathematical operation in the position domain that improves the image quality, with picture elements in the environment of the individual picture element, for each individual picture element of the image to be subjected to the mathematical operation are provided with mutually independent, first weighting factors that have a magnitude dependent on the spatial distance of the respective picture element of the environment from the individual picture element, and with which the mathematical operation is implemented for the individual picture element.

Abstract: In a method for the operation of a magnetic resonance apparatus, wherein a positional change of a region of an examination subject to be imaged relative to an imaging volume of the apparatus is acquired with orbital navigator echos, at least one reference dataset with data points is generated, the data points in the k-space, at least on a partial surface of a spherical surface, being arranged to occupy the partial surface in surface-covering fashion, and the partial surface extending at least around a great circle of the spherical surface corresponding to a maximally expected angular range of the positional change. For acquiring the positional change, a dataset of at least one of the navigator echos is compared to the reference dataset.

Abstract: A method for rotating at least two-dimensional image records with non-isotropic topical resolution, in which a rotation of an image record is described using a rotation matrix; the rotation matrix is represented as a product of at least two shear matrices, each having exactly one element that is dependent on the angle of rotation, while their remaining elements are exclusively ones and zeroes; the matrix element, which is dependent on the angle of rotation, of at least one shear matrix is multiplied by a factor; and the rotation of the image record is carried out in Fourier space without interpolations and without forming an isotropic auxiliary record, by exploiting the displacement set of the Fourier transformation by implementing the shear matrices as displacements of line elements of the image record.

Abstract: In a method for the operation of a magnetic resonance apparatus, nuclear magnetic signals obtained from an image region of an examination subject that is positioned in an imaging volume of the apparatus are entered into a k-space matrix as respective complex numbers are a motion model is determined with which translational motion of the subject with respect to the imaging volume can be described with a time-dependency, at least for prescribable points of the image region. The motion model is determined with respective phase values of at least two values of the k-space matrix that are point-symmetrically located in the k-space matrix with respect to a symmetry point of the k-space matrix. These two values behave as complex conjugates of each other in the absence of any motion between the registration times of the two values, and, any translational motion is thus reflected in the phase values. The values of the k-space matrix are corrected according to the motion model determined in this manner.

Abstract: In a method for the operation of a magnetic resonance tomography apparatus having a gradient system and a radio-frequency system that, among other things, serve for location coding, a region to be imaged in an examination subject is placed in an imaging volume of the apparatus. Image datasets of at least parts of the region to be imaged are generated in a time sequence. A positional change of at least a part of the region to be imaged with respect to the imaging volume is determined by a comparison of at least a first image dataset to a second image dataset that have been generated in chronological succession. A location coding is adapted corresponding to the identified positional change for at least one image dataset that is generated following the compared image datasets in time.

Abstract: In a method for the implementation of a perfusion measurement with magnetic resonance imaging, image datasets of a region of an examination subject to be imaged and positioned in an imaging volume of a magnetic resonance apparatus are generated in a time sequence, positional changes of the region to be imaged that occur relative to the imaging volume during the time sequence are acquired, and a correction of influences of the positional changes on the image datasets ensues according to the acquired positional changes.

Abstract: In a method for the operation of a magnetic resonance apparatus, in a first examination of an examination subject, a first scout dataset of the examination subject is produced and with reference to which at least one first slice of an examination subject to be imaged is determined. A further scout dataset of the examination subject is produced in at least one further examination of the examination subject temporally following the first examination. A change in position between the first and the further scout dataset is identified, and at least one further slice of the examination subject to be imaged is defined according to the identified positional change, this at least one further slice exhibiting an identical positioning within the examination subject with respect to the first slice.

Abstract: The invention is directed to a method for motion correction given series of two-dimensional images of a rigid body, whereby the rigid body does not lie completely in the coverage area of the images and is cut off at one image edge or, respectively, at two image edges that do not lie opposite one another. Given two time-successive images, the mirror image or, respectively, the mirror images of the other are respectively attached to the one. A simple motion correction method is then implemented between the two newly arisen images that now show an approximately rigid body that lies completely within the coverage area of these newly arisen images.

Abstract: In a method for operating a magnetic resonance tomography system having a shim coil arrangement and a gradient coil arrangement, in which, in order to generate an image dataset of a region of an examination subject to be imaged, at least the region that is to be imaged is borne in an imaging volume of the system, an initial shim adjustment procedure is carried out, a change (if it occurs) in the position of the imaged region in relation to the imaging volume is detected, and a current in the shim coil arrangement is modified dependent on the detected position change.

Abstract: In a method for the operation of a magnetic resonance apparatus, wherein a positional change of a region of an examination subject to be imaged relative to an imaging volume of the apparatus is acquired with orbital navigator echos, at least one reference dataset with data points is generated, the data points in the k-space, at least on a partial surface of a spherical surface, being arranged to occupy the partial surface in surface-covering fashion, and the partial surface extending at least around a great circle of the spherical surface corresponding to a maximally expected angular range of the positional change. For acquiring the positional change, a dataset of at least one of the navigator echos is compared to the reference dataset.

Abstract: In a method for the operation of a magnetic resonance apparatus an anatomical image of a region of an examination subject to be imaged is generated with a prescribable resolution and quality, a functional image of the region to be imaged is generated, the functional image is superimposed on the anatomical image, and at least one area of the region to be imaged wherein the functional image contains unreliable information is identified in the superimposition.

Abstract: In a method for the operation of a magnetic resonance apparatus, nuclear magnetic signals obtained from an image region of an examination subject that is positioned in an imaging volume of the apparatus are entered into a k-space matrix as respective complex numbers are a motion model is determined with which translational motion of the subject with respect to the imaging volume can be described with a time-dependency, at least for prescribable points of the image region. The motion model is determined with respective phase values of at least two values of the k-space matrix that are point-symmetrically located in the k-space matrix with respect to a symmetry point of the k-space matrix. These two values behave as complex conjugates of each other in the absence of any motion between the registration times of the two values, and, any translational motion is thus reflected in the phase values. The values of the k-space matrix are corrected according to the motion model determined in this manner.

Abstract: In a method for the implementation of a perfusion measurement with magnetic resonance imaging, image datasets of a region of an examination subject to be imaged and positioned in an imaging volume of a magnetic resonance apparatus are generated in a time sequence, positional changes of the region to be imaged that occur relative to the imaging volume during the time sequence are acquired, and a correction of influences of the positional changes on the image datasets ensues according to the acquired positional changes.

Abstract: In a method for the operation of a magnetic resonance apparatus, in a first examination of an examination subject, a first scout dataset of the examination subject is produced and with reference to which at least one first slice of an examination subject to be imaged is determined. A further scout dataset of the examination subject is produced in at least one further examination of the examination subject temporally following the first examination. A change in position between the first and the further scout dataset is identified, and at least one further slice of the examination subject to be imaged is defined according to the identified positional change, this at least one further slice exhibiting an identical positioning within the examination subject with respect to the first slice.

Abstract: In a method for operating a magnetic resonance tomography system having a shim coil arrangement and a gradient coil arrangement, in which, in order to generate an image dataset of a region of an examination subject to be imaged, at least the region that is to be imaged is borne in an imaging volume of the system, an initial shim adjustment procedure is carried out, a change (if it occurs) in the position of the imaged region in relation to the imaging volume is detected, and a current in the shim coil arrangement is modified dependent on the detected position change.

Abstract: In a method for the operation of a magnetic resonance tomography apparatus having a gradient system and a radio-frequency system that, among other things, serve for location coding, a region to be imaged in an examination subject is placed in an imaging volume of the apparatus. Image datasets of at least parts of the region to be imaged are generated in a time sequence. A positional change of at least a part of the region to be imaged with respect to the imaging volume is determined by a comparison of at least a first image dataset to a second image dataset that have been generated in chronological succession. A location coding is adapted corresponding to the identified positional change for at least one image dataset that is generated following the compared image datasets in time.