Numerical simulation of time-resolved 3D phase-contrast magnetic resonance imaging
Fig 2
Diagram of a typical gradient echo pulse sequence with frequency and phase encoding gradients along x-axis and y-axis, and slice selection gradient along z-axis.
Each k-space line is filled during the readout event where the signal is measured by the receiver coil. This pulse sequence is repeated changing the phase encoding gradient amplitudes (Gy) after each repetition time TR to incrementally fill the k-space lines, as represented by the several amplitudes. For full Cartesian k-space sampling, the time between the RF-excitation and half the readout corresponds to the echo time and is denoted TE. It is a characteristic time of the evolution of the isochromats between the excitation by the RF and the signal measurement.