METHOD FOR SUBJECT-SPECIFIC OPTIMISATION OF A MULTI-BAND RF PULSE, COMPUTER PROGRAM, COMPUTER READABLE MEDIUM AND MAGNETIC RESONANCE SYSTEM AND CONTROL UNIT FOR CARRYING OUT THE METHOD

• Main Authors: NEJI, Radhouene, DING YUAN, Belinda, TOMI-TRICOT, Raphael, DRAGONU, Iulius, AGHAEIFAR, Ali
• Format: Patent
• Language: English; French; German
• Published: 16.04.2025
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

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.