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In the medical diagnostic technique known as positron emission tomography (PET) , a positron and an electron annihilate each other and two -ray photons are emitted. What is the angle between the momentum vectors of the two photons?
Cerebrum
The largest part of the brain, responsible for voluntary muscular activity, vision, speech, taste, hearing, thought, and memory.
Limbic System
A complex system of nerves and networks in the brain, involved in basic emotions and drives.
Hypothalamus
A region of the brain responsible for hormone production and regulation of vital bodily functions such as temperature and hunger.
Pons
A part of the brain located in the brainstem, vital for regulating breathing, communication between different parts of the brain, and relaying sensory information.
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