PET scanning (Edexcel GCSE Physics): Flashcards
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PET acronym meaning
PET acronym meaning
Positron Emission Tomography
Main purpose of PET scanning
Main purpose of PET scanning
See organ function & diagnose conditions like cancer
What PET scans show
What PET scans show
Areas of high metabolic activity
Why cancer cells show clearly on PET scans
Why cancer cells show clearly on PET scans
Higher metabolism - use more energy than healthy cells
Substance injected in PET scanning
Substance injected in PET scanning
Radioactive tracer with positron-emitting isotope
What happens when positron meets electron
What happens when positron meets electron
They annihilate each other
What's released when positron & electron annihilate
What's released when positron & electron annihilate
Gamma rays in opposite directions
Gamma ray pairs needed to pinpoint tumour location
Gamma ray pairs needed to pinpoint tumour location
At least 3 pairs
Method to locate tumour from gamma ray detection
Method to locate tumour from gamma ray detection
Triangulation
Why short half-life isotopes used in PET scans
Why short half-life isotopes used in PET scans
Decay quickly, don't stay in body too long
Machine that makes isotopes on-site at hospitals
Machine that makes isotopes on-site at hospitals
Cyclotron
Why isotopes made close to hospital
Why isotopes made close to hospital
Activity decreases if transported far - less useful