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PET ScansPET Scans

Lesson Objectives:Describe how PET scans are used

P matrix = 0.6mm, = 0.1

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Revision..Revision..

Name the different types of nuclear radiation that can occur.

What is anti-matter?

What happens when an anti-particle and a particle meet each other?

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++ Decay Decay

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Neutron-deficient isotopes can decay by emitting Neutron-deficient isotopes can decay by emitting positronspositrons

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Neutron retained by the nucleusNeutron retained by the nucleus

positronpositron Net effect: one Net effect: one proton proton replaced by replaced by

• neutronneutron• positronpositron

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Non-invasive Medical Imaging Techniques

Non-invasive Medical Imaging Techniques

MRI (Magnetic Resonance Imaging) - uses a magnetic field

CAT

X-Ray

MRICAT – (Computerised Tomography) - uses X-rays

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Positron Emission TomographyPositron Emission Tomography

- Do not show anatomy of the body

- Only processes which are going on

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NucleusNucleus

NeutronsNeutrons

ProtonsProtons

ElectronsElectrons

Positron (Positron (++) Decay) Decay

18F-FDG

emits positrons

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PET ImagingPET Imaging

1. Inject radioisotope

2. Measure gamma-ray emissions from isotope

3. Sensors detect the gamma rays

4. Computes create a picture to show the position of the source

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TaskTask

The following sentences on your worksheet have been jumbled up. Cut them out and rearrange them to describe how a PET scan works.

When you are sure they are in the correct order stick them in your book.

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