Question 1

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

Accepted Answer

A) True 
 B)False  False

Question 2

An examination of the abdomen has a WW of 400 and a WL of 0. Which of the following is true given these settings?

Accepted Answer

A)  All structures between -200 and 200 will spread through the gray scale 
B)  All structures between -200 and 200 will be white 
C)  All structures between -200 and 200 will be black 
D)  Only those structures above 400 will have different shades of gray 
A)  All structures between -200 and 200 will spread through the gray scale 
B)  All structures between -200 and 200 will be white 
C)  All structures between -200 and 200 will be black 
D)  Only those structures above 400 will have different shades of gray A

Question 3

Windowing in CT is an example of:

Accepted Answer

A)  a local processing operation. 
B)  convolution. 
C)  gray-level mapping. 
D)  an image reconstruction algorithm. 
A)  a local processing operation. 
B)  convolution. 
C)  gray-level mapping. 
D)  an image reconstruction algorithm. C

Question 4

Windowing is an example of a linear image manipulation technique.

Accepted Answer

A) True 
 B)False

Question 5

One industry standard in data transfer and connectivity is:

Accepted Answer

A)  Digital Imaging and Communications in Medicine (DICOM). 
B)  hospital information system. 
C)  radiology information system. 
D)  picture archiving and communications system. 
A)  Digital Imaging and Communications in Medicine (DICOM). 
B)  hospital information system. 
C)  radiology information system. 
D)  picture archiving and communications system.

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

The range of CT numbers is the WL.

Accepted Answer

A) True 
 B)False

Question 8

The created multiplanar reconstruction images are poorer in quality than the obtained transaxial images.

Accepted Answer

A) True 
 B)False

Question 9

The CT number for water is +1000.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following basic visualization tools allows for the mean and standard deviation within a given ROI?

Accepted Answer

A)  ROI statistics 
B)  CT histogram 
C)  Highlighting 
D)  Multiple windowing 
A)  ROI statistics 
B)  CT histogram 
C)  Highlighting 
D)  Multiple windowing

Question 11

As the WW increases, picture contrast:

Accepted Answer

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

Question 12

If the WW setting is 200 and the WL is 0, which of the following occurs?

Accepted Answer

A)  CT numbers greater than +100 appear white 
B)  CT numbers less than 100 appear gray 
C)  CT numbers between 0 and +200 appear black 
D)  Only those numbers between +100 and +200 appear gray 
A)  CT numbers greater than +100 appear white 
B)  CT numbers less than 100 appear gray 
C)  CT numbers between 0 and +200 appear black 
D)  Only those numbers between +100 and +200 appear gray

Question 13

Which advanced tool in CT allows users to view a large set of images very quickly?

Accepted Answer

A)  Cine visualization 
B)  Advanced quantitative measurement 
C)  Interactive visualization 
D)  Virtual reality visualization 
A)  Cine visualization 
B)  Advanced quantitative measurement 
C)  Interactive visualization 
D)  Virtual reality visualization

Question 14

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

Accepted Answer

A)  Back-projection reconstruction 
B)  FBP reconstruction 
C)  Multiplanar reconstruction 
D)  Radiation treatment planning CT 
A)  Back-projection reconstruction 
B)  FBP reconstruction 
C)  Multiplanar reconstruction 
D)  Radiation treatment planning CT

Question 15

A large WW means a long gray scale.

Accepted Answer

A) True 
 B)False

Question 16

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

Accepted Answer

A)  kVp 
B)  Milliamperage 
C)  WW 
D)  WL 
A)  kVp 
B)  Milliamperage 
C)  WW 
D)  WL

Question 17

The WL in CT is the:

Accepted Answer

A)  center of a range of CT numbers. 
B)  pixel depth. 
C)  range of CT numbers. 
D)  center of the CT matrix. 
A)  center of a range of CT numbers. 
B)  pixel depth. 
C)  range of CT numbers. 
D)  center of the CT matrix.

Question 18

A WL of -150 Hounsfield units (HU) is appropriate for viewing the lungs.

Accepted Answer

A) True 
 B)False

Question 19

A narrow WW implies that the transition from black to white will take place over a wide range of CT numbers.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A)  Window level (WL) 
B)  Window width (WW) 
C)  Contrast controls on the television monitor 
D)  Filtered back-projection (FBP) algorithm 
A)  Window level (WL) 
B)  Window width (WW) 
C)  Contrast controls on the television monitor 
D)  Filtered back-projection (FBP) algorithm

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

An examination of the abdomen has a WW of 400 and a WL of 0. Which of the following is true given these settings?

Windowing in CT is an example of:

Windowing is an example of a linear image manipulation technique.

One industry standard in data transfer and connectivity is:

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

The range of CT numbers is the WL.

The created multiplanar reconstruction images are poorer in quality than the obtained transaxial images.

The CT number for water is +1000.

Which of the following basic visualization tools allows for the mean and standard deviation within a given ROI?

As the WW increases, picture contrast:

If the WW setting is 200 and the WL is 0, which of the following occurs?

Which advanced tool in CT allows users to view a large set of images very quickly?

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

A large WW means a long gray scale.

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

The WL in CT is the:

A WL of -150 Hounsfield units (HU) is appropriate for viewing the lungs.

A narrow WW implies that the transition from black to white will take place over a wide range of CT numbers.

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

Computed Tomography: an Overview

Digital Image Processing

Physical Principles of Computed Tomography

Data Acquisition Concepts

Image Reconstruction

Iterative Reconstruction Basics

Basic Instrumentation

Image Quality

Radiation Dose in Computed Tomography

Multislice Computed Tomography: Physical Principles and Instrumentation

Other Technical Applications of Computed Tomography Imaging: Basic Principles

Three-Dimensional Computed Tomography: Basic Concepts

Positron Emission Tomographyct Petct and Single-Photon Emission Computed Tomographyct Spectct Hybrid Scanners

Computed Tomography of the Head, Cerebral Vessels, Neck, and Spine

Computed Tomography of the Body

Pediatric Computed Tomography

Quality Control for Computed Tomography Scanners

Filters

Exam 8: Image Postprocessing and Visualization Tools

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

An examination of the abdomen has a WW of 400 and a WL of 0. Which of the following is true given these settings?

Windowing in CT is an example of:

Windowing is an example of a linear image manipulation technique.

One industry standard in data transfer and connectivity is:

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

The range of CT numbers is the WL.

The created multiplanar reconstruction images are poorer in quality than the obtained transaxial images.

The CT number for water is +1000.

Which of the following basic visualization tools allows for the mean and standard deviation within a given ROI?

As the WW increases, picture contrast:

If the WW setting is 200 and the WL is 0, which of the following occurs?

Which advanced tool in CT allows users to view a large set of images very quickly?

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

A large WW means a long gray scale.

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

The WL in CT is the:

A WL of -150 Hounsfield units (HU) is appropriate for viewing the lungs.

A narrow WW implies that the transition from black to white will take place over a wide range of CT numbers.

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

Computed Tomography: an Overview

Digital Image Processing

Physical Principles of Computed Tomography

Data Acquisition Concepts

Image Reconstruction

Iterative Reconstruction Basics

Basic Instrumentation

Image Quality

Radiation Dose in Computed Tomography

Multislice Computed Tomography: Physical Principles and Instrumentation

Other Technical Applications of Computed Tomography Imaging: Basic Principles

Three-Dimensional Computed Tomography: Basic Concepts

Positron Emission Tomographyct Petct and Single-Photon Emission Computed Tomographyct Spectct Hybrid Scanners

Computed Tomography of the Head, Cerebral Vessels, Neck, and Spine

Computed Tomography of the Body

Pediatric Computed Tomography

Quality Control for Computed Tomography Scanners

Filters