Question 1

Which of the following generates sagittal, coronal, and paraxial images from transaxial slices?

Accepted Answer

A)  back-projection reconstruction
B)  filtered back-projection reconstruction
C)  multiplanar reconstruction
D)  radiation treatment planning computed tomography C

Question 2

One major disadvantage of multiplanar reconstruction is that images are not as good as those obtained in transaxial images.

Accepted Answer

A) True 
 B)False  True

Question 3

A large window width indicates that there is a relatively ______________ gray scale.

Accepted Answer

A)  long
B)  short
C)  narrow
D)  curved A

Question 4

Gray-level mapping belongs to the class of:

Accepted Answer

A)  point processing technique
B)  local processing technique
C)  global processing technique
D)  geometrical processing technique

Question 5

Which of the following belongs to the class of nonlinear image manipulation techniques?

Accepted Answer

A)  image enhancement
B)  image smoothing
C)  gray-scale manipulation
D)  linear smoothing

Question 6

Reconstruction synthesis operations create images from other images or nonimage data.

Accepted Answer

A) True 
 B)False

Question 7

The range of computed tomography numbers is the window length.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following are advantages to reformatted images? 
I. enable visualization of specific structures
II. determine true extent of lesions and fractures
III. provide images more pleasing to the eye

Accepted Answer

A)  I and II
B)  II and III
C)  I and III
D)  I, II, and III

Question 9

When the window length is centered on the lungs, the image display is optimized for the lungs.

Accepted Answer

A) True 
 B)False

Question 10

In which of the following are pixels in a certain region of the image made to appear brighter?

Accepted Answer

A)  highlighting
B)  image magnification
C)  region of interest transfer
D)  point-to-point imaging

Question 11

Which of the following determines the maximum number of gray shades to be displayed on the television monitor?

Accepted Answer

A)  window level
B)  window width
C)  contrast controls on the television monitor
D)  filtered back-projection algorithm

Question 12

Multiplanar reconstruction creates three-dimensional images from the transaxial data set.

Accepted Answer

A) True 
 B)False

Question 13

A narrow window width implies that the transition from black to white will take place over a wide range of computed tomography numbers.

Accepted Answer

A) True 
 B)False

Question 14

A narrow window width means fewer computed tomography numbers.

Accepted Answer

A) True 
 B)False

Question 15

The window width in computed tomography is the:

Accepted Answer

A)  center of a range of computed tomography numbers
B)  pixel depth
C)  range of computed tomography numbers
D)  dimension of the matrix

Question 16

Image smoothing is an example of a linear image manipulation technique.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following are categories of three-dimensional rendering? 
I. surface-shaded display
II. volume rendering
III. maximum and minimum intensity projections

Accepted Answer

A)  I and II
B)  II and III
C)  I and III
D)  I, II, and III

Question 18

Which of the following optimizes the image display for a particular structure?

Accepted Answer

A)  peak kilovoltage
B)  milliamperage
C)  window width
D)  window length

Question 19

As the window width increases, picture contrast:

Accepted Answer

A)  increases
B)  decreases
C)  remains unchanged
D)  is optimized to show the specific anatomical structures

Question 20

As the window width decreases, the image contrast increases.

Accepted Answer

A) True 
 B)False

Exam 8: Image Postprocessing and Visualization Tools

Which of the following generates sagittal, coronal, and paraxial images from transaxial slices?

One major disadvantage of multiplanar reconstruction is that images are not as good as those obtained in transaxial images.

A large window width indicates that there is a relatively ______________ gray scale.

Gray-level mapping belongs to the class of:

Which of the following belongs to the class of nonlinear image manipulation techniques?

Reconstruction synthesis operations create images from other images or nonimage data.

The range of computed tomography numbers is the window length.

Which of the following are advantages to reformatted images? I. enable visualization of specific structures II. determine true extent of lesions and fractures III. provide images more pleasing to the eye

When the window length is centered on the lungs, the image display is optimized for the lungs.

In which of the following are pixels in a certain region of the image made to appear brighter?

Which of the following determines the maximum number of gray shades to be displayed on the television monitor?

Multiplanar reconstruction creates three-dimensional images from the transaxial data set.

A narrow window width implies that the transition from black to white will take place over a wide range of computed tomography numbers.

A narrow window width means fewer computed tomography numbers.

The window width in computed tomography is the:

Image smoothing is an example of a linear image manipulation technique.

Which of the following are categories of three-dimensional rendering? I. surface-shaded display II. volume rendering III. maximum and minimum intensity projections

Which of the following optimizes the image display for a particular structure?

As the window width increases, picture contrast:

As the window width decreases, the image contrast increases.