Patent ID: 6842000
Filing Date: 2005-01-11
Classification: G01R

Abstract:
1. Method of acquiring data for the illustration of an image which shows the spatial distribution of the magnetic resonance behavior of an object within a selected object area which is disposed in a stationary and the most homogenous possible longitudinal magnetic field and is subjected to a sequence of HF-pulses and magnetic field gradient pulses in different spatial directions, such that a sequence of useful echoes (E), encoded in dependence upon the location, of the magnetisation which is transversal with respect to the stationary magnetic field is produced which useful echoes are acquired as a data record for the reconstruction of the image to be illustrated, wherein between an HF-pulse which excites the transversal magnetisation and the production of the useful echoes (E) a diffusion-weighting sequence is introduced which leads to an attenuation in the transversal magnetisation which is dependent upon the diffusion procedures in the selected object area, and wherein from this diffusion-weighted transversal magnetisation a navigator signal is produced by echo-generation (N characterised in that prior to the production of the useful echoes (E) at least one of those interference variables in the phase characteristic of the navigator signal (N and that the result of this measurement is utilised in order to change the phase characteristic of the transversal magnetisation, from which the useful echoes are generated, for the purpose of compensating for the measured variable.