Rapidly flowing protons can crcate different intensities from stationary protons and the resultant signals obtained by special sequences can demonstrate vessels, aneurysms and arteriovenous malformations. Vessels displayed simultaneously, may make interpretation difficult, but selection of a specific MR section can demonstrate a single vessel or bifurcation. By selecting a specific flow velocity, MRA will show either arteries or veins. The resolution does not match other techniques. MRA will only detect 95% of those aneurysms seen on intra-arterial DSA (see page 43).
Cerebral veins - oblique view showing sagittal sinus
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