Siemens Healthcare Gmbh

The United States of America, As Represented by the Secretary, Department of Health and Human Services

Julius-maximilians-universitat Wurzburg

Herbert Köstler

Manuel Stich

Tobias Wech

Anne Slawig

Andrew Dewdney

Gudrun Ruyters

Adrienne Campbell

Richard Dederichs

Christiane Pfaff

A method for recording a magnetic resonance image dataset includes providing a magnetic resonance sequence with a series of sequence blocks, and providing at least one correction term to compensate for a magnetic field change. The magnetic field change is produced as a change of an actual magnetic field compared to a setpoint magnetic field by gradient pulses. The magnetic field change is established via a transfer characteristic of the gradient system of the magnetic resonance installation. The at least one correction term is used to compensate for the magnetic field change, and at least one magnetic resonance image dataset is recorded with the magnetic resonance sequence using the correction term.

Method for recording a magnetic resonance image dataset, data medium, computer program product, and magnetic resonance installation

A method for recording a magnetic resonance image data set includes providing a magnetic resonance sequence. The magnetic resonance sequence includes at least one radio-frequency pulse and a slice-selection gradient pulse applied during or before the radio-frequency pulse, which is configured as non-constant. The method includes providing at least one correction term for compensating a magnetic field change of the slice-selection gradient pulse. The magnetic field change is ascertained via a transfer characteristic of the gradient system of the magnetic resonance system. The method also includes recording at least one magnetic resonance image data set with the magnetic resonance sequence using the correction term.

Method for recording a magnetic resonance image data set, data carrier, computer-program product, and magnetic resonance system

A gradient system characterization function (e.g., a gradient system transfer function) may be developed by measuring a behavior of the MR device at a target temperature and developing at least one gradient system characterization function for a gradient coil of a magnetic resonance (MR) device at the target temperature based on the measured behavior. A patient may be subsequently imaged by the MR device, wherein the imaging process comprises measuring a temperature of a gradient coil, determining a gradient system characterization function at the measured temperature, calculating a pre-emphasized gradient of the gradient coil, and imaging the patient using the pre-emphasized magnetic field component.

Pre-emphasis techniques based on temperature dependent gradient system behavior for trajectory correction in magnetic resonance imaging

In a method and magnetic resonance (MR) apparatus for data acquisition with fat-water separation in a resulting MR image, an MR data acquisition sequence is operated to acquire MR signals from a subject. Said MR signals comprise fat signals originating from fat in the subject and water signals originating from water in the subject, are acquired by executing a frequency-modulated balanced steady-state free-precession (bSSFP) sequence. The MR signals are entered as numerical values into a memory organized as k-space, the memory thereby containing k-space data. An image is reconstructed from the k-data and subjected to regional phase correction. The corrected image being composed of respective pixels having an intensity produced by the fat signals and an intensity produced by the water signals, with the respective pixels being readily distinguishable from each other in the image due to use of the frequency-modulated bSSFP sequence and the block regional correction.

Method and magnetic resonance apparatus for reconstructing an image from data acquired from a frequency-modulated balanced steady-state free precession sequence

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Retzbach, Germany

Herbert Köstler