Magnetic resonance tomography unit for localizing metallic objects and operating method
AssigneeSiemens Healthineers AG
InventorsJonas Faust, Peter Speier, Florian Maier
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Abstract
A magnetic resonance tomography unit for localizing metallic objects and an operating method are provided. In one act of the method, an excitation pulse is used to excite nuclear spins in a region surrounding a compact metallic object. Magnetic resonance data is acquired with samplings along a plurality of trajectories, where the samplings take place using a bSSFP sequence, and the nuclear spins are dephased by a gradient. A position of a geometric focal point of the compact metallic object is ascertained based on a position of a visual focal point of acquired artifacts.
Claims15
A method for localizing a metallic object that is compact in three dimensions or a linear metallic object that is compact in two dimensions using a magnetic resonance tomography unit, the method comprising:
- exciting nuclear spins in a region surrounding the compact linear metallic object using an excitation pulse;
- and
- acquiring magnetic resonance data with samplings along a plurality of trajectories, wherein the nuclear spins are dephased by a gradient, wherein the samplings take place using a bSSFP sequence,
- wherein a position of a geometric focal point of the compact linear metallic object is ascertained based on a position of a visual focal point of acquired artifacts that are generated by the compact linear metallic object in a mapping reconstructed from the magnetic resonance data.
A magnetic resonance tomography unit for localizing a metallic object that is compact in three dimensions or a linear metallic object that is compact in two dimensions,
- wherein the magnetic resonance tomography unit is configured to:
- excite nuclear spins in a region surrounding the compact linear metallic object using an excitation pulse;
- acquire magnetic resonance data with samplings along a plurality of trajectories;
- dephase the nuclear spins using a gradient;
- carry out the samplings using a bSSFP sequence;
- ascertain a position of a geometric focal point of the compact linear metallic object based on a position of a visual focal point of an acquired artifact that is generated by the compact linear metallic object in a mapping reconstructed from the magnetic resonance data.
In a non-transitory computer-readable storage medium that stores instructions executable by a magnetic resonance tomography unit for localizing a metallic object that is compact in three dimensions or a linear metallic object that is compact in two dimensions, the instructions comprising:
- exciting nuclear spins in a region surrounding the compact linear metallic object using an excitation pulse;
- and
- acquiring magnetic resonance data with samplings along a plurality of trajectories, wherein the nuclear spins are dephased by a gradient, wherein the samplings take place using a bSSFP sequence,
- wherein a position of a geometric focal point of the compact linear metallic object is ascertained based on a position of a visual focal point of acquired artifacts that are generated by the compact linear metallic object in a mapping reconstructed from the magnetic resonance data.
Dependencies are inferred from the claim text.