Question 1

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 2

This scanner uses a wide fan beam and a fixed array of detectors that encircle the patient.

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 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

Question 4

The DAS will

Accepted Answer

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

Question 5

Radiation dose is _______ proportional to the number of detector rows in

Accepted Answer

A) directly; increases 
B) directly; decreases 
C) indirectly; increases 
D) indirectly; decreases 
A) directly; increases 
B) directly; decreases 
C) indirectly; increases 
D) indirectly; decreases

Question 6

The matrix of CT numbers is the

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 7

The dose notification and alert system is designed to optimize dose and terminates the x-ray exposure if values become too high.

Accepted Answer

A) True 
 B)False

Question 8

The component of the computer dedicated to performing the enormous number of calculations necessary for CT is the

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 9

Filtered back projection is used to analyze the _____ data for one slice to determine the ______________________

Accepted Answer

A) raw;µ of each slice 
B) raw;µ of each voxel 
C) image;µ of each slice 
D) image;µ of each voxel 
A) raw;µ of each slice 
B) raw;µ of each voxel 
C) image;µ of each slice 
D) image;µ of each voxel

Question 10

Electron-beam CT does not use an x-ray tube.

Accepted Answer

A) True 
 B)False

Question 11

Scan time remains constant for all CT studies.

Accepted Answer

A) True 
 B)False

Question 12

This is the process that allows the tube to continue rotating around the patient without the need to rewind

Accepted Answer

A) Spiral CT 
B) Multislice CT 
C) Slip-ring technology 
D) Cone beam 
A) Spiral CT 
B) Multislice CT 
C) Slip-ring technology 
D) Cone beam

Question 13

Using a detector array with multiple rows allows this type of scanning.

Accepted Answer

A) Spiral CT 
B) Multislice CT 
C) Slip-ring technology 
D) Cone beam 
A) Spiral CT 
B) Multislice CT 
C) Slip-ring technology 
D) Cone beam

Question 14

Based on the Hounsfield scale,the CT number of bone is approximately

Accepted Answer

A) -1000 
B) 0 
C) 1000 
D) None of the above 
A) -1000 
B) 0 
C) 1000 
D) None of the above

Question 15

A CT image typically has a ________________ matrix

Accepted Answer

A) 64 × 64 
B) 128 × 128 
C) 256 × 256 
D) 512 × 512 
A) 64 × 64 
B) 128 × 128 
C) 256 × 256 
D) 512 × 512

Question 16

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 17

A tissue that attenuates more x-rays than water has a CT number

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 18

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 the above 
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 the above

Question 19

The x-ray tube used in CT systems has a larger-diameter anode because

Accepted Answer

A) larger images are created with CT 
B) the tube is bigger and the anode is proportional 
C) CT studies produce enormous amounts of heat 
D) none of the above 
A) larger images are created with CT 
B) the tube is bigger and the anode is proportional 
C) CT studies produce enormous amounts of heat 
D) none of the above

Question 20

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

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

This scanner uses a wide fan beam and a fixed array of detectors that encircle the patient.

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

The DAS will

Radiation dose is _______ proportional to the number of detector rows in

The matrix of CT numbers is the

The dose notification and alert system is designed to optimize dose and terminates the x-ray exposure if values become too high.

The component of the computer dedicated to performing the enormous number of calculations necessary for CT is the

Filtered back projection is used to analyze the _ data for one slice to determine the __________________

Electron-beam CT does not use an x-ray tube.

Scan time remains constant for all CT studies.

This is the process that allows the tube to continue rotating around the patient without the need to rewind

Using a detector array with multiple rows allows this type of scanning.

Based on the Hounsfield scale,the CT number of bone is approximately

A CT image typically has a ________________ matrix

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

A tissue that attenuates more x-rays than water has a CT number

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

The x-ray tube used in CT systems has a larger-diameter anode because

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)?

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

Radiographic Exposure Technique

Scatter Control

Image Receptors

Exposure Technique Selection

Image Intensified Fluoroscopy

Additional Equipment

Filters

Exam 16: Computed Tomography

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

This scanner uses a wide fan beam and a fixed array of detectors that encircle the patient.

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

The DAS will

Radiation dose is _______ proportional to the number of detector rows in

The matrix of CT numbers is the

The dose notification and alert system is designed to optimize dose and terminates the x-ray exposure if values become too high.

The component of the computer dedicated to performing the enormous number of calculations necessary for CT is the

Filtered back projection is used to analyze the _____ data for one slice to determine the ______________________

Electron-beam CT does not use an x-ray tube.

Scan time remains constant for all CT studies.

This is the process that allows the tube to continue rotating around the patient without the need to rewind

Using a detector array with multiple rows allows this type of scanning.

Based on the Hounsfield scale,the CT number of bone is approximately

A CT image typically has a ________________ matrix

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

A tissue that attenuates more x-rays than water has a CT number

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

The x-ray tube used in CT systems has a larger-diameter anode because

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)?

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

Radiographic Exposure Technique

Scatter Control

Image Receptors

Exposure Technique Selection

Image Intensified Fluoroscopy

Additional Equipment

Filters

Filtered back projection is used to analyze the _ data for one slice to determine the __________________