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Questions and Answers
What does each number in an image matrix represent?
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?
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?
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?
What does the field of view (FOV) refer to in imaging?
What is the typical matrix size used in CT imaging?
What is the typical matrix size used in CT imaging?
Flashcards
Image Representation
Image Representation
In medical imaging, images are represented as a matrix of numbers. Each number represents a three-dimensional volume element called a voxel.
Voxel
Voxel
A voxel is a three-dimensional volume element in an object, represented by a single number in the image matrix.
Pixel
Pixel
In medical imaging, a pixel is a two-dimensional picture element representing a voxel in the image.
Field of View (FOV)
Field of View (FOV)
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CT Pixel Size
CT Pixel Size
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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.
