Patent ID: 9615769
Date: 2017-04-11
CPC Classifications: A61B,G01R

Claim:
1. A method to generate a radio-frequency (RF) excitation pulse together with a gradient curve for a targeted excitation of nuclear spins in an arbitrarily shaped volume, comprising: from a computerized control unit, operating a magnetic resonance (MR) data acquisition unit in which an examination volume is situated, to prepare a volume segment in said volume to cause only nuclear spins within said volume to contribute to an MR signal in a subsequent detection of said magnetic resonance signal; from said control unit, operating said MR data acquisition unit to detect said MR signal from said volume segment while activating at least one gradient that causes data representing the detected magnetic resonance signal to be entered into an electronic memory organized as k-space, along a trajectory in k-space defined by said at least one gradient, said MR signal having an MR signal curve with respect to time and said at least one gradient having a gradient curve with respect to time; and in said control unit, automatically generating said RF excitation pulse for said targeted excitation as an RF pulse having an RF pulse curve that is a temporal inversion of said MR signal curve, and generating said gradient curve for said targeted excitation as a gradient having a gradient curve that is a temporal inversion of the gradient curve of said at least one gradient activated during detection of said MR signal, and making an electronic signal available at an output of said control unit embodying said RF excitation pulse and said gradient curve for said targeted excitation in a form usable to operate said MR data acquisition unit to implement said targeted excitation.