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7 - Neuroimaging

7 neuroimaging

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Unformatted text preview: Imaging Anatomy of the CNS Basic Imaging Types Basic Imaging Types X­ray CT (Computed Tomography) MRI (Magnetic Resonance Imaging) Angiography X­ray X­ray Limited Use Evaluation of: – Bones, fractures – Calcification X­ray X­ray Computed Tomography Computed Tomography What is CT? What is CT? X­ ray study, therefore has risks. Beams of X­ray are shot through object, and received on the other side. This is done in a 360o manner. Computer reconstructions of each 360o turn gives us each image “slice”. Based on tissue density. Sections only in axial plane. Magnetic Resonance Imaging Magnetic Resonance Imaging What is MR? What is MR? Not an X­ray, electromagnetic (similar to microwave) Electromagnetic field aligns all the protons in the brain. Radiofrequency pulses cause the protons to spin. Amount of energy emitted from the spin is proportional to number of protons in the tissue. No ferromagnetic objects. Angiography Angiography Angiography Angiography Real time X­ray study Catheter placed through femoral artery is directed up aorta into the cerebral...
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