PET scanning (Edexcel GCSE Physics): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What does PET stand for in PET scanning?
What does PET stand for in PET scanning?
Positron Emission Tomography
Why do cancer cells show up clearly on a PET scan?
Why do cancer cells show up clearly on a PET scan?
They have a higher metabolism
What is injected into the patient during a PET scan?
What is injected into the patient during a PET scan?
A radioactive substance with an isotope
What happens when a positron meets an electron in the body?
What happens when a positron meets an electron in the body?
They annihilate each other
What is released when a positron and electron annihilate?
What is released when a positron and electron annihilate?
Gamma rays in opposite directions
How many pairs of gamma rays are needed to pinpoint a tumour location?
How many pairs of gamma rays are needed to pinpoint a tumour location?
At least 3 pairs
What method is used to pinpoint the location of a tumour in PET scanning?
What method is used to pinpoint the location of a tumour in PET scanning?
Triangulation
Why are short half-life isotopes used in PET scans?
Why are short half-life isotopes used in PET scans?
They decay quickly and don't stay long
What machine do some hospitals use to make isotopes on-site?
What machine do some hospitals use to make isotopes on-site?
A cyclotron
Why must isotopes be made close to the hospital?
Why must isotopes be made close to the hospital?
Their activity decreases as they decay
Where does the radioactive tracer collect in the body?
Where does the radioactive tracer collect in the body?
In areas with high metabolism
What does PET scanning primarily help doctors to see?
What does PET scanning primarily help doctors to see?
How organs are functioning