BIOL 1010 Lecture Notes - Cerebral Palsy, Differential Diagnosis, Neuropsychology
30 Jan 2013
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Document Summary
A moving beam of x-rays passes into a horizontal cross-section of the patient"s brain, scanning it through 360 degrees; The moving x-ray detector on the other side measures the amount of radioactivity that penetrates, thus detecting subtle differences in tissue density; A computer uses the information to construct a 2-d , detailed image of the cross-section, giving it optimal contrasts, then the patient"s head is moved, and the machine scans another cross-section of the brain; The resulting images can show the enlargement of ventricles, which signals degeneration of tissue and the locations of tumours and blood clots. Magnetic resonance imaging (mri): is superior to the ct scan because it produces pictures of higher quality and does not rely on even the smallest amount of radiation. The person is placed inside a arge, circular magned, which causes the hydrogen atoms in the body to move.
