PSYCH 2NF3 Chapter Notes - Chapter 7: Nuclear Magnetic Resonance Spectroscopy, Functional Magnetic Resonance Imaging, Positron Emission Tomography
29 Mar 2019
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Involves passing a narrow x ray beam through the same object at many angles, creating many images. Images are then manipulated using computing and mathematical techniques to create a. Sufficient for localizing brain tumours and lesions: lesions appear as darker areas in ct scan (fewer neurons and more fluids in the region) When a brain region active: blood, oxygen and glucose increases in that region: we can infer changes in brain activity from these measures using pet"s, fmri"s and optical tomography. Used to study metabolic activity in brain cells engaged in processing brain functions such as language. Indirectly detects changes in the brain"s blood flow. The pet scanner: doughnut shaped array of radiation detectors that goes around a person"s head. Computer reconstructs color-coded images representing areas of higher / lower blood flow. Infers rather than directly measures local neural activity: use the procedure of subtraction". Brain regions activated = ones where photons are detected most.
