Pulse sequence for the rapid imaging in the nuclear magnetic resonance tomography

摘要

Pulse sequence for a nuclear spin tomography device with the following features:a) acts on an examination zone a homogeneous magnetic field (b₀), the nuclear spins in a predetermined direction (z) alignsb) are the nuclear spins by radio frequency pulses (rf) with a repetition time (t_R) excited, the short than the spin - grid - relaxation time, the repetition time (tr) further is dimensioned in such a way that the phase deviation between the nuclear spins in the examination volume due to magnetic field inhomogeneities within a repetition time (tr) is smaller than 180° remainsc) between each two rf pulses (rf), a read-out gradient (gr) with l component pulses (gr2, gr3, gr4) connected with alternating polarity, with every sub-pulse (gr) a nuclear magnetic resonance signal (s) in the form of an echo is created and at least a portion of said signals into read-out intervals (aq) is read outd) all between two successive pulses switched-on gradient (gs, gr, gp) have a gradient - time - integral zero to.