US 12,007,460 B2
Actuating a magnetic resonance device with compensated Maxwell phase
Mario Zeller, Erlangen (DE); Kun Zhou, Shenzhen (CN); and Dominik Paul, Bubenreuth (DE)
Assigned to Siemens Healthineers AG, Forchheim (DE)
Filed by Siemens Healthcare GmbH, Erlangen (DE)
Filed on Sep. 2, 2022, as Appl. No. 17/902,081.
Claims priority of application No. 21194854 (EP), filed on Sep. 3, 2021.
Prior Publication US 2023/0072449 A1, Mar. 9, 2023
Int. Cl. G01R 33/565 (2006.01); G01R 33/54 (2006.01); G01R 33/561 (2006.01)
CPC G01R 33/56581 (2013.01) [G01R 33/543 (2013.01); G01R 33/5618 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for actuating a magnetic resonance (MR) device according to an MR control sequence comprising:
at least one excitation pulse followed by at least two consecutive refocusing pulses, wherein, between exactly two of the at least two consecutive refocusing pulses, all magnetic field gradients acting on a readout axis of the readout gradient induce a first Maxwell phase and at least one readout gradient is provided; and
a bipolar gradient pulse having a first part and a second part of opposite polarity arranged between the excitation pulse and a first of the at least two consecutive refocusing pulses, wherein a Maxwell phase induced by the bipolar gradient pulse corresponds to between 40% and 60% of the first Maxwell phase, a gradient moment of the bipolar gradient pulse corresponds to a dephasing gradient moment for the readout gradient, and a duration of the bipolar gradient pulse corresponds at most to a first time interval between the excitation pulse and a first of the at least two consecutive refocusing pulses.