Biomedical Engineering Reference
In-Depth Information
Figure 3.16: Flow phase dephasing and rephasing: stationary pins are dephased
between the first gradient pulse that later rephrased in opposite direction at the
echo time . Moving spins acquire an additional phase shift
φ
as they move along
a spatially dependent gradient.
Figure 3.17: Two-dimensional MRA (left on top) and 3D MRA (bottom on left)
angiogram images are shown to highlight the limitations and advantages of
each. Magnitude contrast provides signal enhancement over long distance (on
right).
