Patent ID: 8482282
Filing Date: 2013-07-09
Classification: G01R

Abstract:
1. A method to determine k-space positions for modeling radio-frequency (RF) pulses for exciting nuclear spins in an examination subject to cause emission of magnetic resonance signals, comprising the steps of: (a) selecting a target magnetization in the examination subject for excitation of nuclear spins in the examination subject by radiation of an RF pulse; (b) selecting a first achievable magnetization in the examination subject, as a current achievable magnetization; (c) in a processor, automatically determining a deviation of the current achievable magnetization from the target magnetization; (d) in said processor automatically determining a spectrum of the deviation in k-space as a current spectrum; (e) in said processor, localizing at least one maximum in said current spectrum; (f) from said processor, storing k-space positions of said at least one localized maximum in a set of previously determined k-space positions; (g) in said processor, automatically determining current pulse coefficients for producing said RF pulse for exciting said nuclear spins in the examination subject, with which an optimal, current magnetization can be achieved using at least one k-space position from said set of previously determined k-space positions; (h) repeating steps (c) through (g) at least once until a predetermined termination criterion is satisfied and, in each repetition, using at least one k-space position to determine current pulse coefficients that was used in no preceding determination of current pulse coefficients; and (i) making the current pulse coefficients determined in (h), in the repetition in which said termination criterion is satisfied, available as electronic signals at an output of said processor in a form for controlling an RF pulse generator to emit an rf pulse corresponding to said current pulse coefficients determined in (h).