Patent ID: 7847550
Filing Date: 2010-12-07
Classification: G01R

Abstract:
1. A control method for operating coils of a transmission array and a gradient magnet system of a magnetic resonance system, said control method comprising the steps of: from a control device of the magnetic resonance system, activating the coils of the transmission array and the gradient magnet system by supplying an excitation pulse thereto that produces a magnetization in an excitation volume of the magnetic resonance system that exhibits a first actual inhomogeneity; in said control device, automatically determining said excitation pulse based on a start pulse and a maximum allowable inhomogeneity in the excitation volume of the magnetic resonance system, said start pulse having a total time duration; in said control device, giving said start pulse a total time duration that will produce a magnetization in said excitation volume that exhibits a second actual inhomogeneity that is smaller than said maximum allowable inhomogeneity; in said control device, automatically determining an intermediate point within the duration of the start pulse so as to divide the start pulse into a first pulse part and a second pulse part that is complementary to said first pulse part, with said first pulse part corresponding to a low-energy portion of said start pulse and said second pulse part corresponding to a high-energy portion of said start pulse; in said control device, temporally extending the second pulse part and correspondingly compressing the second pulse part in terms of amplitude, to produce a temporally extended and amplitude-compressed second pulse part; employing said temporally extended and amplitude-compressed second pulse part as said excitation pulse; and in said control device, determining said intermediate point to make said first inhomogeneity smaller than said maximum allowable inhomogeneity.