Abstract
The desire to image the brain and spinal cord has been motivated by two major needs: to depict the pathology and to assess the pathophysiology of the structures which, after the First World War, became amenable to surgical interventions. The development of contrast media (CM) has brought increasingly safer compounds, which are increasingly devoid of side effects and capable of visualizing both the vasculature and the cavities of the CNS. Computed tomography (CT) further extended the diagnostic capabilities of CM. Thus, a CT-localized contrast enhancement indicates the barrier breakage since water-soluble CM normally do not pass the blood-brain barrier CT also revived the use of negative CM (i.e., intrathecal nonopaque gases) and prompted experimentation with freely diffusable positive contrast-enhancing agents exhibiting general affinity for the lipids of the CNS. Inhalation of 70% xenon increases the density of the gray matter by 12 HU and that of the white matter by 20 HU; it provides excellent visualization of both brain [1] and spinal cord [2]. The disadvantages of xenon, i.e., its high cost and systemic and anesthetic effects, may well be outweighed by its potential for detecting pathological conditions of the CNS and regional blood flow disturbances. New high-resolution CT scanner systems capable of rapid serial data collection are making dynamic studies possible [3,4].
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References
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Sovak, M. (1984). Contrast Media for Imaging of the Central Nervous System. In: Sovak, M. (eds) Radiocontrast Agents. Handbook of Experimental Pharmacology, vol 73. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-69515-5_6
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