Cambridge AS & A Level Physics
24.3PET scanning
PET scanning in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic22 practice questions1 lesson
Learning objectives
What the syllabus expects you to be able to do.
- 24.3.1Describe a radioactive tracer absorbed by the tissue studied.
- 24.3.2Recall that PET uses a β⁺-decaying tracer.
- 24.3.3Describe annihilation, with conservation of mass-energy and momentum.
- 24.3.4Explain that annihilation in PET gives two gamma photons travelling in opposite directions.
- 24.3.5Calculate the energy of the photons from electron-positron annihilation.
- 24.3.6Explain how detected photon arrival times give an image of tracer concentration.
Lessons
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Positron emission tomography (PET)
40 min
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Sample question
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Turn PET scanning into a strength.
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