الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 152 |  |  |
| | | from | 152 | | |
Abstract
Intracranial aneurysms are acquired lesions that occur in 2% of the population and are the most common cause of non-traumatic subarachnoid hemorrhage (SAH). Exact informations must be obtained pre-operative regarding the location, size, morphology of the aneurysm as well as aneurysmal wall, relationship with the parent vessel and adjacent branches, presence of calcification and thrombus. Conventional techniques for imaging the intracranial arteries are CTA, MRA, and DSA. These techniques reveal abnormalities of the vessel lumen, but they can fail to fully characterize disease that resides within the vessel wall. Recently, enhanced vessel wall imaging MRI (VWI MR) has been used to assess intracranial arterial disease and IAs. from April 2021 to April 2022 we studied 30 patients underwent VW-MRI, their age ranged from 25 to 80 years old with mean age 45 years old, 19 males and 11 females. Vessel wall MRI requires both high contrast resolution (the ability to distinguish differences in signal intensity from two structures) and high spatial resolution (the ability to distinguish between two adjacent structures) to visualize the very small intracranial vessel wall. High contrast resolution is achieved by suppressing the signal from intraluminal arterial blood and extra luminal CSF, the black-blood sequences take advantage of inherent differences in the magnetic relaxation properties and the flowing nature of blood and CSF to suppress their signal leaving only the signal of the vessel wall itself.