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CT Imaging System Components

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Questions and Answers

What is the linear attenuation coefficient dependent on?

The density of the material and the photon energy

The composition of the material, the density of the material, and the photon energy (correct)

Only the composition of the material

Only the photon energy

What is the value of HUwater?

-1000

0 (correct)

1000

What is the Hounsfield unit corresponding to 0.1% of the linear attenuation coefficient of water?

1 (correct)

1000

100

How many grey values are typically offered in an 8-bit grey scale?

128 Signup and view all the answers

What is the purpose of the window level (WL) and window width (WW)?

To define the display of Hounsfield units Signup and view all the answers

What is the primary function of the rotating gantry in a CT imaging system?

To rotate the X-ray source and detector Signup and view all the answers

How is electrical power typically supplied to the rotating gantry?

Through contacts (brushes) from stationary slip rings Signup and view all the answers

What is the unit of measurement for Hounsfield units?

None, HU is a unitless quantity Signup and view all the answers

What is the Hounsfield unit corresponding to air?

-1000 Signup and view all the answers

What happens when the same image data is displayed at different window levels and widths?

The image appears differently Signup and view all the answers