Verfahren zur Subjektspezifischen Optimierung eines Mehrband-Hf-Pulses, Computerprogramm, Computerlesbares Medium und Magnetresonanzsystem sowie Steuergerät zur Durchführung des Verfahrens

Details

Veröffentlichungs-Nr.

EP4321892

Aktenzeichen

EP22190186

Anmeldetag

12. August 2022

Veröffentlichung

16. April 2025

Erteilung

16. April 2025

Rechtsraum

EP

IPC

G01R33/561

Abstract

The invention is directed to a method for optimisation of a multi-band RF pulse (2), wherein the RF pulse is a spokes RF pulse comprising a train of sub-pulses (3), comprising the steps of (a) using a starting k-space position as the current k-space position; (b) for each of the slices to be excited by the RF pulse, performing steps (i) to (iii): (i) calculating (22) a sub-pulse (3) based on the current k-space position and calculating the expected magnetization after that sub-pulse (3); (ii) calculating (24) the inverse Fourier transform of the difference between the expected magnetization and the target magnetisation; (iii) determining (26) an optimal k-space position for the next spoke for this slice to be at the position where the absolute value of the inverse Fourier transform has a maximum; (c) determining (30) the next k-space position for all slices together based on the optimal k-space positions determined for each slice individually; (d) Optionally repeating (34) steps b and c with the next k-space position as the current spoke position, until a predetermined number of spokes has been reached, (f) calculating (40, 42) the multi-band RF pulse (2) based on the k-space positions determined in steps c and optionally d.

Anmelder

Firma

Siemens Healthineers AG

Land

🇩🇪 Deutschland

Fachgebiete