MINIMIZATION OF EFFECTS OF CONCOMITANT FIELDS IN MULTI ECHO MAGNETIC RESONANCE IMAGING

• Main Authors: Köhler, Michael, von Deuster, Constantin, Ferguson, George William
• Format: Patent
• Language: English; French; German
• Published: 09.12.2020
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The present invention relates to a method for operating an MR system (9) in which MR signals of an object under examination (13) are acquired in an examining region using a multi echo imaging sequence in which an RF excitation pulse (30) and a plurality of RF refocusing pulses (31, 32, 33, 34) are applied, wherein the method comprises the steps of determining a first accumulated phase of a magnetization in the object under examination (13) due to concomitant magnetic fields occurring between a first pair of consecutive RF pulses of the applied RF pulses in at least one location within the examination region, determining a second accumulated phase of the magnetization in the object under examination (13) due to concomitant magnetic fields occurring between a second pair of consecutive RF pulses of the applied RF pulses in the at least one location within the examination region, wherein a predefined relationship exists between the first accumulated phase and the second accumulated phase, determining whether a deviation from the predefined relationship is larger than a threshold, wherein, if this is the case, and applying a measure in view of the fact that the deviation is larger than the threshold.