PSYC 4600 Lecture Notes - Lecture 2: Pulse Oximetry, Positron Emission Tomography, Paramagnetism
11 Dec 2016
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Document Summary
Examines the areas of the brain, structure, but also location of activity. Purpose: to get a structural image of the brain, static images. Basically a giant magnet, the magnetic power is measured in tesla (1. 5 to 3 tesla) Atoms are made up of neutrons, protons, and electrons. Human bodies are mostly hydrogen a single proton. A(cid:374) mri"s (cid:373)ag(cid:374)eti(cid:272) field (cid:449)ill alig(cid:374) the spi(cid:374) of the ato(cid:373)s to the (cid:373)ag(cid:374)eti(cid:272) field. Protons that are parallel are in a low e state, antiparallel will be in a high e state. To excite hydrogen: we must excite them at the right frequency to target the hydrogen, certain atoms will absorb energy at a specific frequency resonance frequency. By applying this specific frequency (via radio frequency coils) we selectively excite one type of atom. By measuring the amount of energy that is released, we can estimate the abundance of that atom in that specific area (ie. in brain tissue)
