NSC 4366 1st Edition Lecture 3 Outline of Last Lecture I Introduction to skull anatomy Outline of Current Lecture I Neurologic Imaging a x ray b MRI c CT d PET e Cerebral angiography Current Lecture Skull x ray a simple method to image calcium and its distribution in and around the brain when more precise methods CT are unavailable Computed Tomography CT distinguishes tissue density no density black machine moves around a still patient non invasive fast painless available in all ERs These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute CT scanner rotates a narrow x ray beam around the head The quantity of x ray absorbed in small volumes voxels volume elements of brain measuring 0 5 mm x 1 5 mm is computed Amount of x ray absorbed in any slice of the head can be thus determined absorption is proportional to density of the tissue Black white pictures of head slices are displayed black represents low density and white high density structures A series of 10 or 20 scans each reconstructing a slice of brain is required for a complete study Magnetic Resonance Imaging MRI Magnetic field radio waves Used to see edema hemorrhage tumors takes 40 60 min like motionless noisy not always available spatial distribution of elements with an odd number of protons such as hydrogen within slices of brain can be determined by their reaction to an external radio frequency signal Positron Emission Tomography PET
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