# US 12,007,457 B2 · Actuating a magnetic resonance device with saturation

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- Number: US 12,007,457 B2
- Document ID: US12007457B2
- Status: Granted
- Kind: B2
- Application number: 17/957,004
- Filed: 2022-09-30
- Published: 2023-03-30
- Granted: 2024-06-11
- Earliest claimed: 2021-09-30
- Assignees: Siemens Healthineers AG
- Applicants: Siemens Healthcare GmbH
- Inventors: David Grodzki; Thorsten Speckner
- Web page: https://patentgrep.com/patent/US12007457B2

## CPC

- G01R 33/48: NMR imaging systems
- G01R 33/4838: {using spatially selective suppression or saturation of MR signals}
- A61B 5/055: involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
- G01R 33/243: {Spatial mapping of the polarizing magnetic field}
- G01R 33/5608: {Data processing and visualization specially adapted for MR, e.g. for feature analysis and pattern recognition on the basis of measured MR data, segmentation of measured MR data, edge contour detection on the basis of measured MR data, for enhancing measured MR data in terms of signal-to-noise ratio by means of noise filtering or apodization, for enhancing measured MR data in terms of resolution by means for deblurring, windowing, zero filling, or generation of gray-scaled images, colour-coded images or images displaying vectors instead of pixels (image data processing or generation, in general G06T)}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A method for actuating a magnetic resonance system having a radiofrequency unit designed to generate a radiofrequency pulse for the saturation of nuclear spins in an area under examination of an object under examination. The method includes loading a B0 map of the magnetic resonance system; loading frequency information on nuclear spins to be saturated in the area under examination; ascertaining at least one global RF saturation pulse for the global saturation of the nuclear spins to be saturated on the basis of the B0 map and the frequency information; and outputting the RF saturation pulse via the radiofrequency unit of the magnetic resonance system.

## Claims

### Claim 1

A method for actuating a magnetic resonance system having a radiofrequency (RF) unit designed to generate an RF pulse for saturation of nuclear spins in an area under examination of an object under examination, the method comprising:
loading a B0 map of the magnetic resonance system;
loading frequency information on nuclear spins to be saturated in the area under examination;
ascertaining at least one global RF saturation pulse for global saturation of the nuclear spins to be saturated on the basis of the B0 map and the frequency information; and
emitting the global RF saturation pulse via the radiofrequency unit of the magnetic resonance system, wherein the emitted global RF saturation pulse is adjusted in terms of time and space to static and/or dynamic magnetic field changes due to system-specific causes.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein the B0 map is measured only once, on installation of the magnetic resonance system.

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein higher-order gradient-exemplar-specific disturbance terms are loaded, and the ascertainment of global RF saturation pulses takes the gradient-exemplar-specific disturbance terms into consideration.

### Claim 4 (depends on 3)

The method as claimed in claim 3, wherein the gradient-exemplar-specific disturbance terms are measured only once, on startup of the magnetic resonance system.

### Claim 5 (depends on 1)

The method as claimed in claim 1, wherein a protocol planned for an MR measurement is loaded and the ascertainment of global RF saturation pulses takes into consideration a characteristic time of the planned protocol.

### Claim 6 (depends on 1)

The method as claimed in claim 1, wherein a global RF saturation pulse is ascertained only once, on startup of the magnetic resonance system.

### Claim 7 (depends on 1)

The method as claimed in claim 1, wherein the radiofrequency unit has a plurality of transmission channels in signal connection with a plurality of transmission elements of the radiofrequency unit, and the RF saturation pulse has a plurality of components for the plurality of transmission channels.

### Claim 8 (depends on 1)

A magnetic resonance system, comprising: a magnet unit; a gradient unit; a radiofrequency unit; and a controller with a radiofrequency transceiver controller and with an RF saturation pulse determination unit, wherein the controller is designed to execute a method as claimed in claim 1 on the magnetic resonance system.

### Claim 9 (depends on 1)

A non-transitory electronically readable data storage medium with electronically readable control information stored thereon, which comprises at least one computer program and is configured such that when the data storage medium is used in a controller of a magnetic resonance system, it carries out a method as claimed in claim 1.