METHOD AND DEVICE FOR DETERMINATION OF A MAGNETIC RESONANCE CONTROL SEQUENCE

摘要

A magnetic resonance control sequence with a pulse arrangement that acts selectively in at least two spatial directions in order to excite a limited rotationally symmetrical excitation profile within an examination subject has an RF excitation pulse formed as a sequence of multiple partial RF pulses, and gradient pulses in the two spatial directions that are coordinated with the partial RF pulses so that the RF energy introduction of different partial RF pulses in transmission k-space occurs on circular k-space transmission trajectories that are concentric to one another. The amplitude of the RF envelope of the partial RF pulses is constant during the duration of a traversal of each circular k-space trajectory. The control sequence can also be used in a calibration of a magnetic resonance system.

主权项

1. A computerized method to determine a magnetic resonance control sequence for operating a magnetic resonance apparatus, said method comprising:
in a computerized processor, determining said magnetic resonance control sequence as a radio-frequency (RF) excitation pulse, comprised of a sequence of multiple, partial RF pulses, coordinated with gradient pulses in two spatial directions placed in parallel with said sequence of multiple, partial RF pulses so as to cause said RF excitation pulse to selectively excite nuclear spins in at least two spatial directions to produce a limited, rotationally symmetrical excitation profile within an examination subject; in said computerized processor, configuring said sequence of multiple, partial RF pulses to cause an RF energy introduction of different partial RF pulses, among said sequence of multiple, partial RF pulses, in transmission k-space to respectively occur on circular k-space transmission trajectories that are concentric to each other; in said computerized processor, configuring an amplitude of an RF envelope of said partial RF pulses to be respectively constant during a duration of traversal of each circular k-space trajectory; and making the determined magnetic resonance control sequence available at an output of said computerized processor in an electronic format suitable for operating said magnetic resonance apparatus therewith.