Question 1

The high-frequency generator used in CT scanning has minimal voltage ripple, allowing

Accepted Answer

A)  higher kVp to be used 
B)  higher mA to be used 
C)  longer exposures 
D)  more consistent energy x-ray photons 
A)  higher kVp to be used 
B)  higher mA to be used 
C)  longer exposures 
D)  more consistent energy x-ray photons D

Question 2

An image with a WW of 200 and a WL of 50 produces an image that displays pixels with CT numbers ranging from

Accepted Answer

A)  -100 to 100 
B)  -50 to 100 
C)  -50 to 150 
D)  200 to 250 
A)  -100 to 100 
B)  -50 to 100 
C)  -50 to 150 
D)  200 to 250 C

Question 3

This scanner uses a wide fan beam and a rotating array of detectors.

Accepted Answer

A)  First generation 
B)  Second generation 
C)  Third generation 
D)  Fourth generation 
A)  First generation 
B)  Second generation 
C)  Third generation 
D)  Fourth generation C

Question 4

The sequence of computer operations for accomplishing a specific task, such as reconstruction is a(n)

Accepted Answer

A)  array processor 
B)  algorithm 
C)  filtered back projection 
D)  image data 
A)  array processor 
B)  algorithm 
C)  filtered back projection 
D)  image data

Question 5

The process that allows image data to be displayed in coronal or sagittal planes is

Accepted Answer

A)  annotation 
B)  windowing 
C)  region of interest (ROI) 
D)  multiplanar reformation (MPR) 
A)  annotation 
B)  windowing 
C)  region of interest (ROI) 
D)  multiplanar reformation (MPR)

Question 6

This translate-rotate scanner used approximately 30 detectors and a narrow fan beam.

Accepted Answer

A)  First generation 
B)  Second generation 
C)  Third generation 
D)  Fourth generation 
A)  First generation 
B)  Second generation 
C)  Third generation 
D)  Fourth generation

Question 7

The CT number of water is

Accepted Answer

A)  0 
B)  greater than 0 
C)  less than 0 
D)  unable to determine unless more is known 
A)  0 
B)  greater than 0 
C)  less than 0 
D)  unable to determine unless more is known

Question 8

How will a pixel with a CT number of -250 appear if the WW is 600 and the WL is -300?

Accepted Answer

A)  Black 
B)  White 
C)  Gray 
D)  It is impossible to say 
A)  Black 
B)  White 
C)  Gray 
D)  It is impossible to say

Question 9

Which of the following is true concerning adaptive statistical iterative reconstruction (ASIR)?

Accepted Answer

A)  ASIR is a reconstruction technique that starts reconstruction after a first-pass FBP reconstruction 
B)  ASIR techniques shorten reconstruction time while maintaining much lower image noise than if the same raw data were reconstructed with FBP alone 
C)  ASIR reduces quantum noise substantially with no impact on spatial or contrast resolution 
D)  All of these 
A)  ASIR is a reconstruction technique that starts reconstruction after a first-pass FBP reconstruction 
B)  ASIR techniques shorten reconstruction time while maintaining much lower image noise than if the same raw data were reconstructed with FBP alone 
C)  ASIR reduces quantum noise substantially with no impact on spatial or contrast resolution 
D)  All of these

Question 10

This collimator is located between the tube and the patient

Accepted Answer

A)  Prepatient collimator 
B)  Postpatient collimator 
C)  Bowtie filter 
D)  Prepatient collimator and postpatient collimator 
A)  Prepatient collimator 
B)  Postpatient collimator 
C)  Bowtie filter 
D)  Prepatient collimator and postpatient collimator

Question 11

The CT x-ray tube and detector array are found in the

Accepted Answer

A)  central processing unit 
B)  gantry 
C)  detector 
D)  data acquisition system (DAS) 
A)  central processing unit 
B)  gantry 
C)  detector 
D)  data acquisition system (DAS)

Question 12

The limiting factor for contrast resolution is

Accepted Answer

A)  SID 
B)  selection of window level 
C)  noise 
D)  spatial resolution 
A)  SID 
B)  selection of window level 
C)  noise 
D)  spatial resolution

Question 13

Structures such as the breast or thyroid cannot be shielded when they are in the SFOV because an artifact would be created.

Accepted Answer

A) True 
 B)False

Question 14

Filtered back projection uses the bowtie filter to reconstruct the CT image.

Accepted Answer

A) True 
 B)False

Question 15

Logarithmic conversion produces the linear attenuation coefficient data.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following is used to trigger a message when a single planned and confirmed scan is likely to exceed a pre-programmed value (CTDIvol and/or DLP)?

Accepted Answer

A)  Dose report 
B)  Dose notification value 
C)  Dose alert value 
D)  All of these 
A)  Dose report 
B)  Dose notification value 
C)  Dose alert value 
D)  All of these

Question 17

Computed tomography was introduced in the

Accepted Answer

A)  1950s 
B)  1960s 
C)  1970s 
D)  1980s 
A)  1950s 
B)  1960s 
C)  1970s 
D)  1980s

Question 18

The image data is the

Accepted Answer

A)  linear attenuation coefficients 
B)  matrix of CT numbers 
C)  same as the raw data 
D)  none of these 
A)  linear attenuation coefficients 
B)  matrix of CT numbers 
C)  same as the raw data 
D)  none of these

Question 19

When the voxel is large enough to contain different types of tissues, the CT number will be an average of the various tissues' attenuation characteristics. This produces a ____________________

Accepted Answer

A)  streak artifact 
B)  ring artifact 
C)  partial-volume artifact 
D)  beam-hardening artifact 
A)  streak artifact 
B)  ring artifact 
C)  partial-volume artifact 
D)  beam-hardening artifact

Question 20

The DAS will

Accepted Answer

A)  strengthen the electrical signal 
B)  convert the signal to logarithmic information 
C)  digitize the signal 
D)  all of these 
A)  strengthen the electrical signal 
B)  convert the signal to logarithmic information 
C)  digitize the signal 
D)  all of these

The high-frequency generator used in CT scanning has minimal voltage ripple, allowing

An image with a WW of 200 and a WL of 50 produces an image that displays pixels with CT numbers ranging from

This scanner uses a wide fan beam and a rotating array of detectors.

The sequence of computer operations for accomplishing a specific task, such as reconstruction is a(n)

The process that allows image data to be displayed in coronal or sagittal planes is

This translate-rotate scanner used approximately 30 detectors and a narrow fan beam.

The CT number of water is

How will a pixel with a CT number of -250 appear if the WW is 600 and the WL is -300?

Which of the following is true concerning adaptive statistical iterative reconstruction (ASIR)?

This collimator is located between the tube and the patient

The CT x-ray tube and detector array are found in the

The limiting factor for contrast resolution is

Structures such as the breast or thyroid cannot be shielded when they are in the SFOV because an artifact would be created.

Filtered back projection uses the bowtie filter to reconstruct the CT image.

Logarithmic conversion produces the linear attenuation coefficient data.

Which of the following is used to trigger a message when a single planned and confirmed scan is likely to exceed a pre-programmed value (CTDIvol and/or DLP)?

Computed tomography was introduced in the

The image data is the

When the voxel is large enough to contain different types of tissues, the CT number will be an average of the various tissues' attenuation characteristics. This produces a ____________________

The DAS will

Introduction to the Imaging Sciences

Structure of the Atom

Electromagnetic and Particulate Radiation

The X-Ray Circuit

The X-Ray Tube

X-Ray Production

X-Ray Interactions With Matter

Image Production

Image Quality and Characteristics

Digital Image Receptors

Radiographic Exposure Technique

Scatter Control

Exposure Technique Selection

Film-Screen Imaging

Fluoroscopic Imaging

Additional Equipment

Filters

Exam 17: Computed Tomography

The high-frequency generator used in CT scanning has minimal voltage ripple, allowing

An image with a WW of 200 and a WL of 50 produces an image that displays pixels with CT numbers ranging from

This scanner uses a wide fan beam and a rotating array of detectors.

The sequence of computer operations for accomplishing a specific task, such as reconstruction is a(n)

The process that allows image data to be displayed in coronal or sagittal planes is

This translate-rotate scanner used approximately 30 detectors and a narrow fan beam.

The CT number of water is

How will a pixel with a CT number of -250 appear if the WW is 600 and the WL is -300?

Which of the following is true concerning adaptive statistical iterative reconstruction (ASIR)?

This collimator is located between the tube and the patient

The CT x-ray tube and detector array are found in the

The limiting factor for contrast resolution is

Structures such as the breast or thyroid cannot be shielded when they are in the SFOV because an artifact would be created.

Filtered back projection uses the bowtie filter to reconstruct the CT image.

Logarithmic conversion produces the linear attenuation coefficient data.

Which of the following is used to trigger a message when a single planned and confirmed scan is likely to exceed a pre-programmed value (CTDIvol and/or DLP)?

Computed tomography was introduced in the

The image data is the

When the voxel is large enough to contain different types of tissues, the CT number will be an average of the various tissues' attenuation characteristics. This produces a ____________________

The DAS will

Introduction to the Imaging Sciences

Structure of the Atom

Electromagnetic and Particulate Radiation

The X-Ray Circuit

The X-Ray Tube

X-Ray Production

X-Ray Interactions With Matter

Image Production

Image Quality and Characteristics

Digital Image Receptors

Radiographic Exposure Technique

Scatter Control

Exposure Technique Selection

Film-Screen Imaging

Fluoroscopic Imaging

Additional Equipment

Filters