CT Quiz 2/12/15 Flashcards

0
Q

A series of rows and columns of pixels that give the form to the digital image

A

Matrix

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1
Q

Picture element an individual matrix box in each ____ is assigned a CT number

A

Pixel

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2
Q

A 3D tissue volume, height, width and dept of each pixel represents a ____ when viewing an image

A

Voxel

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3
Q

The center value of the window width (Center Value)

A

Window level

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4
Q

(Amount of contrast) mechanism that determines the quantity of HU or the range of CT numbers used to map signals into shades of gray for specific images

A

Window width

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5
Q

Specific numbers are assigned to individual pixels within the image data set based on the type of material image

A

Hounsfield unit

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6
Q

Determines the number of detector cells in which the raw data will be acquired (isocenter is very important)

A

Scan field of view

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7
Q

It determines how much and what section of the collected raw data are used to create an image
◾️zoom or target
◾️data for display on the image

A

Display field of view

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8
Q

Begins with one or more images. the tube and detector remain stationary while the patient moves.

A

Localizer scanner

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9
Q

Table remains stationary while the x-ray tube rotates within the gantry but with a pause as table moves to the next location
◾️ optimal resolution
◾️ usused when speed Is not a concern

A

Axial (step and shoot) scanning

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10
Q

Continuous movement of the table through the gantry and the x-ray tube remains on for an extended time

A

Helical or spiral scanning

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11
Q

Unknown point falls between two straight lines

A

Interpolation

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