PSYCH 2NF3 Lecture 36: Dynamic (Functional) imaging
22 Jan 2019
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Document Summary
Dynamic (functional) imaging: positron emission tomography (pet) Relying on the flow of blood for a radioactive contrast to help us image functional processes (not direct) Image representing areas of high vs. low blood flow. Many elements can be influenced by magnetic fields. Hydrogen: present in water, blood, tissue, bone etc: contains n and s poles, normally these poles are not aligned. When placed in a strong magnetic field, poles become aligned: we then apply second magnetic field (a magnetic pulse) in a different direction. We use the north and south poles of hydrogen atoms to pick up magnetic fields. Poles are usually scattered but in a magnetic field, they align (the mri scanner = the magnetic field) The magnetic pulse: causes the poles to move in a different location. Oxy and deoxy have different magnetic properties of tissues. Given thsse differences, we can pick up on the blood oxygen level dependent (bold)
