Patent Document ID: 20040113616
Application ID: 10463741
Patent Flag: 0

Claim One:
1. A method for measuring velocities in phase contrast magnetic resonance imaging in the presence of magnetic field gradient field inhomogeneities comprising the steps of: a) encoding velocity information in at least three different encoding directions and measuring phase differences (&Dgr;&PHgr;(r)) in each direction, b) deriving actual first moments along the encoding directions using a magnetic field deviation matrix (&Lgr;(r)), c) providing an (N×3) encoding matrix, &OHgr;, where N is the number of encoding directions, based on the ideal first moments along the N directions, and d) computing true velocities as a function of the gyromagnetic ratio, &ggr;, magnetic field deviation matrix (&Lgr;(r)), encoding matrix, &OHgr;, and a phase difference vector (&Dgr;&PHgr;(r)).