الفهرس 
Introduction
Anatomy of lower limb arterial systemOnly 14 pages are availabe for public view
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Abstract
Traumatic vascular injuries involving the extremity occure due to penetrating, blunt or iatrogenic injuries. The rapid detection, of vascular injuries is essential for the effective management .
With widely available MDCT technology, the first-line assessment of vascular injury in trauma patients is CTA. CTA affords a rapid, accurate, noninvasive method of detecting vascular injury and appropriately triaging patients to receive the requisite intervention, when necessary.
MDCTA is performed through rapid injection of intravenous contrast material to opacify the arteries. The timing of the contrast bolus, the positioning of the patient and the correct selection of the appropriate scan-protocol according to the individual body habitus and circulation situation of the patient are important factors in achieving consistently good results.
After acquisition, the commonly used reconstruction algorithms are maximum intensity projection (MIP), volume rendering (VR), multiplanar reconstruction (MPR) or curved planar reconstruction
(CPR).
CT angiographic signs of arterial injury include abrupt narrowing of an artery, loss of opacification of an arterial segment, active extravasation of contrast material, pseudoaneurysm formation, and arteriovenous fistula formation. CT angiograms may be rendered nondiagnostic by motion artifact,lack of opacification of the arteries, and metallic streak artifact.