Siemens Aktiengesellschaft

Jan Ole Blumhagen

Ralf Ladebeck

Matthias Fenchel

Dominik Paul

Harald H Quick

Gerhard Brinker

Daniel Nico Splitthoff

Stephan Kannengieβer

In a method and a magnetic resonance system for fat saturation when acquiring magnetic resonance data in a predetermined volume segment of an examination object, a SPAIR pulse is emitted and an RF excitation pulse is emitted following a predetermined time period after the SPAIR pulse, and magnetic resonance data are thereafter acquired. The time period of at least one slice is set so as to be different from the time period for the remaining slices.

Method and magnetic resonance system for fat saturation

In order to provide an improved homogeneity of a primary magnetic field during a magnetic resonance imaging process, a method for magnetic resonance imaging of a subject under examination using a magnetic resonance device includes an acquisition of magnetic resonance image data in a plurality of scanning blocks. Different shim settings are set in each case for the plurality of scanning blocks.

Method for magnetic resonance imaging and magnetic resonance device

In a method and a magnetic resonance (MR) system for fat saturation when acquiring MR data in a predetermined volume segment of an examination object (O), a flip angle is determined as a function of a predetermined requirement for a fat signal that is acquired by the magnetic resonance system in the volume segment, and an RF preparation pulse is emitted that has the determined flip angle. This is followed by emission of a SPAIR pulse, followed by acquisition of the MR data.

Various embodiments relate to a method for determining distortion-reduced magnetic resonance data in a subarea of a magnetic resonance system located along a radial direction of the magnetic resonance system at the edge of a field of view of the magnetic resonance system. The method includes positioning the object to be examined at a first and a second position along an axial direction of the magnetic resonance system and acquiring first magnetic resonance data in the subarea at the first position and acquiring second magnetic resonance data in the same subarea at the second position. The method also includes determining distortion-reduced magnetic resonance data based on the first and second magnetic resonance data.

Method for determining distortion-reduced magnetic resonance data and magnetic resonance system

A method for imaging a part region of an examination object in a magnetic resonance system. In an embodiment, a first and second gradient field are respectively created such that, at a respective first and second position at the edge of the field of view, a distortion caused by a non-linearity of the respective first and second gradient field, and a distortion caused by a Bo field inhomogeneity, cancel each other out. By way of the respective first and second gradient, respective first and second magnetic resonance data which contains the respective first and second position are acquired. A first and second respective readout direction, in which the respective first and second magnetic resonance data are acquired, are selected as a function of a location of the respective first and second position. From the magnetic resonance data, an image of the part region is defined.

Method for imaging a part region of an examination object in a magnetic resonance system

In a method and magnetic resonance (MR) apparatus to image a partial region of an examination subject by means of a multislice measurement, which partial region includes at least two measurement slices, and is located at least in part at the edge of a field of view of the magnetic resonance apparatus, for each voxel to be optimized that is located at the edge of the field of view, a gradient field is configured for each measurement slice of the partial region that is to be measured and is used to acquire magnetic resonance data in the multislice measurement. The gradient field is configured so as to cause a nonlinearity of the gradient field and a Bfield inhomogeneity to cancel at each of the aforementioned voxel to be optimized at the partial region at the edge of the field of view. An image of the partial region of the examination subject is determined from the magnetic resonance data acquired in this manner.

Method and magnetic resonance system for imaging a partial region of an examination subject

A method is disclosed for performing a combined magnetic resonance/positron emission tomography scan of an examination object in an MR/PET system. An embodiment of the method entails acquiring first magnetic resonance data using a first readout gradient field. The first readout gradient field is chosen such that, at a location of the field of view of the magnetic resonance system, a distortion caused by a nonlinearity of the first readout gradient field and a distortion caused by a Bfield inhomogeneity substantially cancel each other out. First magnetic resonance images for planning the combined magnetic resonance/positron emission tomography session and determining an attenuation correction map for a positron emission tomography scan are determined on the basis of the first magnetic resonance data. Positron emission data and second magnetic resonance data are acquired using a second readout gradient field.

Method for performing combined magnetic resonance/positron emission tomography

A method is disclosed for acquiring magnetic resonance (MR) data for a plurality of layers of an object to be examined in a section of a magnetic resonance system having a basic magnetic field, wherein the section is located at the edge of a Field of View of the magnetic resonance system in the first direction. The method includes producing a first gradient field having a non-linearity of its location dependence in such a way that in the section the non-linearity compensates a local inhomogeneity of the basic magnetic field, and then multiple positioning of the object to be examined in a first direction, so the plurality of layers of the object to be examined perpendicular to the first direction successively includes the section. Finally, it includes the acquisition of magnetic resonance data for each of the layers with recording sequences.

Method for determining magnetic resonance data and a magnetic resonance system

A method is disclosed for calculating a spatially resolved value of an absorption parameter for a positron emission tomography (PET) scan of an examination object via magnetic resonance tomography (MRT). Magnetic resonance data is acquired within a first region lying within a field of view of a magnetic resonance system and within a second region bordering on the first and lying at the edge of the field of view. The method includes the spatially resolved calculation of a first value of the absorption parameter from the first MR data within the first region and of a second value from the second MR data within the second region. A three-dimensional parameter map is obtained from the first value. This parameter map is extended by the second value such that within the first region and the second region the parameter map has the value of the absorption parameter in spatially resolved form.

Method for calculating a value of an absorption parameter in positron emission tomography

In a method to operate an image-generating medical modality in order to avoid harm to a patient caused by an electromagnetic field, an adjustment process is implemented in which the electromagnetic field is radiated by the modality and preliminary image data are acquired using the electromagnetic field; and a clearance between the patient and a wall of the modality is determined from the image. The determined clearance forms the basis of a check process to determine an adaptation of the electromagnetic field for a diagnostic examination of the patient that follows. During the diagnostic examination, that also includes radiation of the electromagnetic field, movement monitoring of the patient takes place and the adjustment process is restarted as soon as a movement of the patient is registered.

Method to operate an image-generating medical modality to avoid patient injury by a modality-generated electromagnetic field

According to an embodiment of a method, a first readout gradient field is determined in such a way that a distortion caused by a non-linearity of the first readout gradient field and a distortion caused by a Bfield inhomogeneity are essentially cancelled at a first location of a field of view of the magnetic resonance facility. Moreover, a second readout gradient field is determined in such a way that a distortion caused by a non-linearity of the second readout gradient field and a distortion caused by a Bfield inhomogeneity are essentially cancelled at a different second location of the field of view. Finally, a multiecho sequence is performed, wherein first magnetic resonance data is captured using the first readout gradient field after a 180&#xb0; pulse and second magnetic resonance data is captured using the second readout gradient field after a further 180&#xb0; pulse.

Method for determining magnetic resonance data

A method is disclosed for imaging a portion of an examination object in a magnetic resonance scanner. The portion is arranged at the edge of a field of view of the magnetic resonance scanner. During at least one embodiment of the method, a gradient field is produced such that a nonlinearity in the gradient field and a B-field inhomogeneity cancel at a predetermined point at the edge of the field of view. Magnetic resonance data, which contains the predetermined point at the edge of the field of view, is acquired with the aid of the gradient field. An image of the portion of the examination object at the predetermined point is determined from the magnetic resonance data.

Method for imaging a portion of an examination object in a magnetic resonance scanner

A method is disclosed for determining a location of a subarea of an area under examination in a magnetic resonance system. The subarea is arranged at the edge of a field-of-view of the magnetic resonance system. In at least one embodiment of the method, at least one slice position is determined for an MR image in which the Bfield at the edge of the MR image satisfies a homogeneity value. For the slice position determined an MR image is acquired which contains the subarea at the edge of the field-of-view and the location of the subarea of the object under examination is determined through the location of the subarea in the MR image.

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Erlangen, Germany

Jan Ole Blumhagen