CT Quiz 2/12/15

Question 0

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

Answer 0

Matrix

Question 1

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

Answer 1

Pixel

Question 2

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

Answer 2

Voxel

Question 3

The center value of the window width (Center Value)

Answer 3

Window level

Question 4

(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

Answer 4

Window width

Question 5

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

Answer 5

Hounsfield unit

Question 6

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

Answer 6

Scan field of view

Question 7

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

Answer 7

Display field of view

Question 8

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

Answer 8

Localizer scanner

Question 9

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

Answer 9

Axial (step and shoot) scanning

Question 10

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

Answer 10

Helical or spiral scanning

Question 11

Unknown point falls between two straight lines

Answer 11

Interpolation