| Abstract: | The diagnostic arsenal for extracranial stenosis includes both ultrasound techniques, such as transcranial Doppler and duplex sonography, which are not only screening methods, but also are used at surgery, and high-tech neuroradiological techniques, such as spiral computed tomographic and magnetic resonance angiography, which can visualize structural changes in the vessel walls and qualitatively and functionally evaluate blood flow in the vascular bed. The purpose of this investigation was to determine the efficacy of non-invasive diagnostic methods, such as magnetic resonance angiography, including phase-contrast magnetic resonance angiography and spiral computed tomographic angiography, in the detection and comprehensive evaluation of stenoses and to compare the feasibilities of noninvasive procedures with the gold standard--selective angiography. |
