At the neck, it ascends inside the transverse foramina from C6 to C2 where it emerges and enters the cranium through the foramen magnum. Each vertebral artery arises from the 1 st part of the corresponding subclavian artery. The posterior circulation consists of the vertebrobasilar system. The internal carotid artery ascends to enter the skull through the carotid canal and bifurcates into the anterior and middle cerebral arteries. They ascend behind the sternoclavicular joints, lateral to the thyroid gland and at the level of the upper border of the thyroid cartilage, each one divides into external and internal carotid arteries. The right common carotid artery arises from the brachiocephalic trunk while the left common carotid artery arises directly from the aorta. The anterior circulation consists of the carotid arteries. The anterior circulation roughly supplies the anterior 2/3 while the posterior circulation supplies the posterior 1/3 of the brain. The brain is supplied by two sets of vessels. previous severe reactions to iodinated contrast.It is important to time the scan as accurately as possible (see practical points) to ensure maximal opacification and decrease venous contamination. #CVS TIMING FULL#The CTA of the cerebral arteries is performed to demonstrate the full patency of the cerebral arteries via contrast enhancement. cerebral parenchymal hemorrhage to assess for the presence of a vascular malformation or ongoing bleeding ( spot sign).subarachnoid hemorrhage for detection of aneurysms.transient ischemic attack to detect carotid artery stenosis.ischemic stroke to detect occlusion and thrombosis.CTA of the cerebral arteries is indicated in a wide variety of clinical scenarios including:
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