A gradient‐echo (GRE) sequence is performed using a flip ang…

A gradient‐echo (GRE) sequence is performed using a flip angle of 80°. The longitudinal magnetization recovery curves for CSF and white matter (WM) over the first two RF pulses are shown below. The values of the longitudinal magnetization for CSF and WM immediately before the second 80° RF pulse are indicated on the graph.  Calculate the strength of the longitudinal magnetization for the two tissues immediately after application of the second 80­° pulse. © NAIT