Method for imaging with nuclear magnetic resonance given a k-space trajectory proceeding on an irregular grid
AssigneeSiemens Aktiengesellschaft
InventorOliver Heid
Life of this patent
Estimating the term…
Abstract
In a method for imaging with nuclear magnetic resonance, magnetic resonance signals are read out under the influence of a magnetic gradient field. A direction of a gradient of the gradient field is modified such during the reception. The k-space trajectory proceeds along a curved path. The magnetic resonance signals are sampled with a variable sampling rate and are digitized. The sampling rate is varied such that an occupation density of k-space with samples is essentially uniform. Interpolation samples that are arranged on a rectangular grid in k-space are generated from the samples by interpolation. The interpolation samples are subjected to a Fourier transformation for generating image data.
Claims5
A method for producing an image with nuclear magnetic resonance comprising the steps of:
- obtaining magnetic resonance signals while a magnetic gradient field is activated, said magnetic gradient field having a gradient with a direction;
- modifying the direction of the gradient of the gradient field while obtaining said magnetic resonance signals, thereby producing a curved k-space trajectory;
- sampling said magnetic resonance signals with a variable sampling rate to obtain samples, and digitizing said samples;
- entering said samples into k-space along said curved k-space trajectory and varying said sampling rate so that an occupation density of k-space with said samples is substantially uniform;
- producing samples on a rectangular grid in k-space by interpolating the samples entered into k-space along said curved k-space trajectory;
- Fourier transforming said samples on said rectangular grid in k-space to generate image data;
- and
- generating a displayable image from said image data.
Dependencies are inferred from the claim text.