Back to results
US 10,094,900 B2Granted
4D velocity profile image recording with a magnetic resonance system
AssigneeSiemens Aktiengesellschaft
InventorAndreas Greiser
Life of this patent
Estimating the term…
Abstract
In a method and device for generating 4D flow images by operation of a magnetic resonance system, a volume flow data record is recorded, wherein the flow is encoded in a single direction. This is subsequently repeated with all the flow encoding directions. From the raw data associated with the individual flow encoding directions, phase images and magnitude images are calculated. Deformation fields are calculated on the basis of the magnitude images. The deformation fields are applied to the calculated phase images. Finally, a 4D flow velocity field is calculated, on the basis of a phase difference reconstruction of the corrected phase images.
Claims14
A method for generating 4D flow images using acquired magnetic resonance (MR) data, comprising:
- operating an MR scanner to acquire a volume flow data record representing flow of a flowing medium in an examination subject situated in the MR scanner, including operating a gradient coil arrangement of the MR scanner to encode MR signals originating from said flow in a single flow encoding direction;
- operating said MR scanner to repeat acquiring said volume flow data record with said gradient coil arrangement being operated to encode said MR signals originating from said flow in a plurality of different flow encoding directions;
- providing said volume flow data record, after repeating acquiring said volume flow data record, to a processor and, in said processor, reconstructing phase images from said volume flow data record, each phase image being respectively associated with a different flow encoding direction;
- in said processor, reconstructing magnitude images from said volume flow data record, each of said magnitude images being respectively associated with a respective flow encoding direction;
- in said processor, calculating deformation fields from said magnitude images;
- in said processor, applying the calculated deformation fields to the reconstructed phase images, thereby obtaining a plurality of corrected phase images;
- in said processor, calculating a 4D flow velocity field by executing a phase difference reconstruction algorithm using the corrected phase images;
- and
- making the calculated 4D flow velocity field available in electronic form at an output of said processor.
6 more elements
A device for generating 4D flow images using acquired magnetic resonance (MR) data, comprising:
- a processor configured to operate an MR scanner to acquire a volume flow data record representing flow of a flowing medium in an examination subject situated in the MR scanner, including operating a gradient coil arrangement of the MR scanner to encode MR signals originating from said flow in a single flow encoding direction;
- said processor being configured to operate said MR scanner to repeat acquiring said volume flow data record with said gradient coil arrangement being operated to encode said MR signals originating from said flow in a plurality of different flow encoding directions;
- said processor being configured to, after repeating acquiring said volume flow data record, to reconstruct phase images from said volume flow data record, each phase image being respectively associated with a different flow encoding direction;
- said processor being configured to reconstruct magnitude images from said volume flow data record, each of said magnitude images being respectively associated with a respective flow encoding direction;
- said processor being configured to calculate deformation fields from said magnitude images;
- said processor being configured to apply the calculated deformation fields to the reconstructed phase images, thereby obtaining a plurality of corrected phase images;
- said processor being configured to calculate a 4D flow velocity field by executing a phase difference reconstruction algorithm using the corrected phase images;
- and
- said processor being configured to make the calculated 4D flow velocity field available in electronic form at an output of said processor.
6 more elements
A magnetic resonance (MR) apparatus comprising:
- an MR scanner comprising a gradient coil arrangement;
- a processor configured to operate said MR scanner to acquire a volume flow data record representing flow of a flowing medium in an examination subject situated in the MR scanner, including operating said gradient coil arrangement of the MR scanner to encode MR signals originating from said flow in a single flow encoding direction;
- said processor being configured to operate said MR scanner to repeat acquiring said volume flow data record with said gradient coil arrangement being operated to encode said MR signals originating from said flow in a plurality of different flow encoding directions;
- said processor being configured to, after repeating acquiring said volume flow data record, to reconstruct phase images from said volume flow data record, each phase image being respectively associated with a different flow encoding direction;
- said processor being configured to reconstruct magnitude images from said volume flow data record, each of said magnitude images being respectively associated with a respective flow encoding direction;
- said processor being configured to calculate deformation fields from said magnitude images;
- said processor being configured to apply the calculated deformation fields to the reconstructed phase images, thereby obtaining a plurality of corrected phase images;
- said processor being configured to calculate a 4D flow velocity field by executing a phase difference reconstruction algorithm using the corrected phase images;
- and
- said processor being configured to make the calculated 4D flow velocity field available in electronic form at an output of said processor.
7 more elements
A non-transitory, computer-readable data storage medium encoded with programming instructions, said storage medium being loaded into a control computer of a magnetic resonance (MR) apparatus that comprises an MR scanner having a gradient coil arrangement, said programming instructions causing said control computer to:
- operate said MR scanner to acquire a volume flow data record representing flow of a flowing medium in an examination subject situated in the MR scanner, including operating said gradient coil arrangement of the MR scanner to encode MR signals originating from said flow in a single flow encoding direction;
- operate said MR scanner to repeat acquiring said volume flow data record, with said gradient coil arrangement being operated to encode said MR signals originating from said flow in a plurality of different flow encoding directions;
- after repeating acquiring said volume flow data record, reconstruct phase images from said volume flow data record, each phase image being respectively associated with a different flow encoding direction;
- reconstruct magnitude images from said volume flow data record, each of said magnitude images being respectively associated with a respective flow encoding direction;
- calculate deformation fields from said magnitude images;
- apply the calculated deformation fields to the reconstructed phase images, thereby obtaining a plurality of corrected phase images;
- calculate a 4D flow velocity field by executing a phase difference reconstruction algorithm using the corrected phase images;
- and
- make the calculated 4D flow velocity field available in electronic form at an output of said control computer.
6 more elements
Dependencies are inferred from the claim text.