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CT Imaging Concepts

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Questions and Answers

What does each number in an image matrix represent?

A field of view measurement

An entire image

A three-dimensional volume element called a voxel (correct)

A pixel in a two-dimensional space

How is the pixel size in a CT scan determined?

By adding the FOV to the matrix size

By dividing the FOV by the matrix size (correct)

By subtracting the FOV from the matrix size

By multiplying the FOV with the matrix size

What is the relationship between a voxel and a pixel?

A voxel is the 2D representation of a pixel

Voxels are projected as two-dimensional pixels in images (correct)

A pixel represents a three-dimensional voxel

Pixels are made up of multiple voxels

What does the field of view (FOV) refer to in imaging?

<p>The area being imaged, measured in diameter</p> Signup and view all the answers

What is the typical matrix size used in CT imaging?

<p>512 x 512</p> Signup and view all the answers

Study Notes

Image Representation as a Matrix

Images are represented as matrices, which are two-dimensional arrays of numbers.
Each number in the matrix represents a three-dimensional volume element (voxel).
Voxels are represented in two dimensions as pixels (picture elements).

Field of View (FOV)

FOV is the diameter of the body region being imaged.
Example FOV sizes: 25 cm (head) and 40 cm (abdomen).

CT Pixel Size Calculation

CT pixel size is calculated by dividing the FOV by the matrix size.
Common matrix size in CT is 512 x 512.

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Description

Explore the basics of CT imaging, including how images are represented as matrices and the significance of the field of view (FOV). This quiz covers essential calculations and concepts like pixel size and voxel representation. Enhance your understanding of both technical and practical aspects of CT imaging.