Patent ID: 7999545
Filing Date: 2011-08-16
Classification: G01R

Abstract:
1. A method for determining amplitude and phase dependencies of radio frequency pulses that are irradiated during traversal of a specified k-space trajectory to produce an n-dimensional spatial pattern (n>=1) of transverse magnetization in an object as part of a spatially resolved magnetic resonance experiment using at least one RF transmission antenna of a magnetic resonance measurement system, the method comprising the steps of: a) defining a set of basic pulses, a pulse being a totality of all RF wave shapes emitted by the at least one RF transmission antenna used during a transmission operation; b) individually irradiating the basic pulses of the set, thereby traversing the specified k-space trajectory; c) producing at least one set of basic patterns through detection of MR signals excited through irradiation of the basic pulses in step b), wherein, at least in a range of the object to be examined, each basic pattern is proportional to a complex transverse magnetization produced by each basic pulse, the k-space trajectory being traversed in a fully identical manner for each basic pulse, at least from a beginning of irradiation of a respective basic pulse; d) approximating a defined target pattern using a linear combination of the basic patterns of the set or using a mathematical relationship among intermediate patterns generated through identical linear combination of the basic patterns within each set; and e) determining the amplitudes and phase dependencies of the desired RF pulses using a corresponding linear combination of the basic pulses.