Patent ID: 8947085
Filing Date: 2015-02-03
Classification: G01R

Abstract:
1. A method for diffusion-weighted acquisition of magnetic resonance (MR) signals, comprising: from a computerized control system, operating an MR data acquisition unit with an image acquisition pulse sequence comprising a diffusion segment composed of multiple diffusion coding gradients, at least one RF pulse configured to excite nuclear spins in an examination subject located in the MR data acquisition unit to cause emission of MR signals from the subject, said MR signals comprising MR signal portions generated with a desired signal coherence path and MR signal portions generated with unwanted signal coherence paths, and said image acquisition sequence comprising readout gradients configured to read out said MR signals; in said computerized control system, determining MR signal portions with said unwanted signal coherence paths dependent on said image acquisition sequence; and from said computerized control unit activating dephasing gradients that reduce, in the MR signals read out by said readout gradients, said MR signal portions with said unwanted signal coherence paths, and determining said dephasing gradients in said computerized control system dependent on said diffusion coding gradients and dependent on said unwanted signal coherence paths by causing a gradient moment, of each of said dephasing gradients, to be greater than a threshold for each of said unwanted signal coherence paths.