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12 Questions

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CT Scan Imaging Fundamentals

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Questions and Answers

What is the primary phenomenon that occurs when an x-ray beam interacts with a structure in a CT image?

Attenuation (correct)

Diffraction

Refraction

Scattering

What is the unit of measurement for the linear attenuation coefficient?

mm^-1

cm^-1 (correct)

nm^-1

m^-1

In conventional film-screen radiography, how are the densities of structures determined?

By comparing the shades of gray to known objects (correct)

Via the linear attenuation coefficient

Through quantitative measurements

Using the Hounsfield scale

What are the units of measurement for quantifying beam attenuation in CT?

Hounsfield units (Hu) Signup and view all the answers

What is the term used to describe the reduction of a beam's intensity as it passes through a material?

Attenuation Signup and view all the answers

Who is credited with the development of CT and has units of measurement named after him?

Godfrey Hounsfield Signup and view all the answers

What is the Hounsfield unit value of distilled water?

0 Signup and view all the answers

What is the purpose of windowing in CT images?

To adjust the grayscale component of the image to highlight specific structures Signup and view all the answers

What is the range of CT numbers?

-1000 to +1000 Signup and view all the answers

What is the purpose of the Window Width (WW)?

To adjust the contrast of the image Signup and view all the answers

What is the typical Window Level (WL) for a Soft Tissue window?

50 HU Signup and view all the answers

What is the purpose of a Bone window?

To view the bones Signup and view all the answers