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BIOMEDICAL ENGINEERING SYSTEM
Gamma CameraEngr Khaleeque Ahmed
Sir syed university of engineering & technology
Karachi
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GAMMA CAMERA
• A camera for nuclear imaging was invented by H. Anger in
the 1960’s (The Anger camera)
• Gamma camera is considered as one of the most
important devices used in the fields of nuclear medicine.
• Produce functional images of the body parts, used for
diagnosis purpose.
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Anger camera
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HOW A GAMMA CAMERA WORKS
Patient is injected by radiotracer(radioisotope), emits gamma radiation. Then gamma camera scans the radiation area and creates an image.
To detect the gamma photons we use a large crystal of sodium iodide. The crystal gives a tiny flash of visible light every time a gamma photon hits it. This flash is picked up by photomultipliers which convert the flash into an electrical signal. The electrical signals from the photomultipliers are analyzed by a computer to construct an image.
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COMPONENTS OF GAMMA CAMERA
Collimator
Detector
PMT(photomultiplier tool)
Position localization circuit
Correction circuitry
Monitor
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COLLIMATOR
Made up of large number of small holes drilled in a
plate of lead.
Provide right direction
Types
-parallel hole
-pin hole
-converging
-diverging
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DETECTORS
Converts received radiations into light photons
Used scintillation detectors (NaI)
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PMT(PHOTOMULTIPLIER TOOL)
Its an evacuated glass tube
Perform two functions
1st conversion of light photons
2nd signal amplification
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POSITION LOCALIZATION CIRCUIT
Provide positional information
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COMPUTER
Process incoming data
Display it as a readable image
Store images
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THANK YOU………….!!!!