Phase contrast angiography (PCA) uses magnetic gradient characteristics and the developed phase shift of flowing blood in order to encode the blood flow velocity. Intracranial venous PCA-MRA (MR venography) provides the visualization of the dural venous sinuses (superior sagittal, transverse, straight and sigmoid sinuses), the larger deep cerebral (cavernous sinus) and cortical veins without the need for a contrast agent. The projection shows a transverse view of brain vessels.
For in the final analysis, our most basic common link, is that we all inhabit
this small planet, we all breathe the same air, we all cherish our children's
futures, and we are all mortal. - John F. Kennedy