25. PET scans require extremely fast computers coupled with gamma-ray detectors capable of accurate energy measurements. Explain

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25. PET scans require extremely fast computers coupled with gamma-ray detectors capable of accurate energy measurements. Explain why both energy accuracy and comparison of arrival times are crucial to the success of a PET scan. [Hint: In a PET scan, two opposing detectors pick up pair annihilation gamma-ray photons.]

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