Chapter

Imaging in neurological diseases

Andrew J. Molyneux, Shelley Renowden and Marcus Bradley

in Oxford Textbook of Medicine

Published on behalf of Oxford University Press

Published in print May 2010 | ISBN: 9780199204854
Published online November 2012 | e-ISBN: 9780199570973 | DOI: http://dx.doi.org/10.1093/med/9780199204854.003.02433_update_001

Series: Oxford Textbooks

Imaging in neurological diseases

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Computed tomography (CT) and magnetic resonance imaging (MRI) are the most important imaging techniques in the diagnosis of neurological disease.

During exposure to a series of narrow X-ray beams, a detector array spins around the patient and measures the absorption coefficients of tissues within the beam, the different coefficients providing image contrast. Helical and multidetector CT now allow analysis of up to 256 slices at a time (and with the prospect of more), with the patient moving continuously through the machine. This enables very rapid scanning and the ability to acquire angiographic (CT angiography and venography) and functional information (CT perfusion). A series of cross-sectional images are produced, usually in the axial plane. Multiplanar reconstructions can be obtained in the sagittal, coronal, and oblique planes, as required. Iodinated contrast agents, as employed in general vascular imaging, are commonly used for image enhancement....

Chapter.  7000 words.  Illustrated.

Subjects: Neurology

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