Yr13 Gamma Camera

What is the crystal in a gamma camera made from?

• lead fluoride

• sodium iodide

• sodium fluoride

• lead iodide

In which order do gamma rays fall on the sections in a gamma camera

• collimator, crystal,photomultiplier

• crystal, collimator, photomultiplier

• photomultiplier, collimator, crystal

What is the collimator made from?

• plastic

• sodium iodide

• lead

• copper

The collimator is used to multiply the gamma waves

• true

• false

Gamma photons are incident on the photomultiplier tubes. What is first released at the cathode?

• more gamma

• electrons

• light

What is the role of the photmultiplier tubes ( select the best two answers)

• To amplify the signal

• To convert gamma to an electrical pulse

• To convert gamma to a final image

• To cause minmal noise in the signal

Why is a photomultiplier tube better than a geiger muller tube ( choose 2) ?

• it is not radioactive where as a geiger muller tube is radioactive

• it is faster at detection

• it is more efficient at detection

True or false? A gamma camera contains one photomultiplier tube.

• true

• false

what is the typical pd inside a photomultiplier tube

• 7V

• 70V

• 700V

• 0.7V

Which is true?

• A gamma camera is needed for PET scans

• A gamma camera is needed for CT scans

• A gamma camera is needed for ultrasound scans

• A gamma camera is needed for MRI scans