Question 1

The formula for dose length product (DLP)is

Accepted Answer

A) DLP = CTDIvol x scan length of exposure 
B) DLP = CTDIvol + scan length of exposure 
C) DLP = CTDIvol - scan length of exposure 
D) DLP = CTDIvol / scan length of exposure 
A) DLP = CTDIvol x scan length of exposure 
B) DLP = CTDIvol + scan length of exposure 
C) DLP = CTDIvol - scan length of exposure 
D) DLP = CTDIvol / scan length of exposure A

Question 2

A pitch of 1 indicates that with each rotation of the tube

Accepted Answer

A) the table is moving farther than the slice thickness 
B) the table is moving less than the slice thickness 
C) the table is moving the same distance as the slice thickness 
D) None of the above 
A) the table is moving farther than the slice thickness 
B) the table is moving less than the slice thickness 
C) the table is moving the same distance as the slice thickness 
D) None of the above C

Question 3

Automatic tube current modulation is a method

Accepted Answer

A) to reduce patient exposure 
B) to improve image quality 
C) similar to automatic exposure control 
D) A and C 
E) B and C 
A) to reduce patient exposure 
B) to improve image quality 
C) similar to automatic exposure control 
D) A and C 
E) B and C D

Question 4

Image postprocessing results in the image data changing.

Accepted Answer

A) True 
 B)False

Question 5

The CT gantry houses the

Accepted Answer

A) x-ray tube 
B) detector array 
C) collimators 
D) data acquisition system (DAS) 
E) all of the above 
A) x-ray tube 
B) detector array 
C) collimators 
D) data acquisition system (DAS) 
E) all of the above

Question 6

Which of the following measures mean absorbed dose in the scanned object volume,adjusted for weighted index and pitch in MSCT?

Accepted Answer

A) CTDI100 
B) CTDIvol 
C) DLP 
D) Dose report 
A) CTDI100 
B) CTDIvol 
C) DLP 
D) Dose report

Question 7

This shading artifact is due to the beam energy changing (and therefore the CT numbers)as the beam passes through the anatomy

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 8

Pitch ranges from

Accepted Answer

A) 0 to 5 
B) 0.5 to 2 
C) 1 to 5 
D) 2 to 4 
A) 0 to 5 
B) 0.5 to 2 
C) 1 to 5 
D) 2 to 4

Question 9

The collimator that improves image contrast by limiting the amount of scatter radiation that reaches the detector is the

Accepted Answer

A) prepatient collimator 
B) postpatient collimator 
C) A and B 
D) none of the above 
A) prepatient collimator 
B) postpatient collimator 
C) A and B 
D) none of the above

Question 10

The DAS receives an electrical signal from the detector-photodiode.

Accepted Answer

A) True 
 B)False

Question 11

The scintillation-type detector is commonly used in today's CT scanner.

Accepted Answer

A) True 
 B)False

Question 12

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 13

The composite electrical signal based on transmission values is the

Accepted Answer

A) view 
B) ray 
C) profile 
D) all of the above 
A) view 
B) ray 
C) profile 
D) all of the above

Question 14

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

Question 15

Which of the following is used to trigger a message when cumulative dose at a location,plus the dose for the next planned and confirmed scan(s),is likely to exceed a pre-programmed value?

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

Question 16

The Z axis for CT scanning goes from

Accepted Answer

A) side to side 
B) head to foot 
C) back to front 
D) none of the above 
A) side to side 
B) head to foot 
C) back to front 
D) none of the above

Question 17

Using a larger matrix or thinner slice will reduce the

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 18

The smallest component of the matrix is the

Accepted Answer

A) matrix 
B) pixel 
C) voxel 
D) voxel volume 
A) matrix 
B) pixel 
C) voxel 
D) voxel volume

Question 19

Most modern CT scanners are based on _______________________ technology.

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 20

Because of the minimal amount of scatter radiation produced during a CT scan,there is no need to be concerned with the protection of others who must remain in the room during a CT scan.

Accepted Answer

A) True 
 B)False

The formula for dose length product (DLP)is

A pitch of 1 indicates that with each rotation of the tube

Automatic tube current modulation is a method

Image postprocessing results in the image data changing.

The CT gantry houses the

Which of the following measures mean absorbed dose in the scanned object volume,adjusted for weighted index and pitch in MSCT?

This shading artifact is due to the beam energy changing (and therefore the CT numbers)as the beam passes through the anatomy

Pitch ranges from

The collimator that improves image contrast by limiting the amount of scatter radiation that reaches the detector is the

The DAS receives an electrical signal from the detector-photodiode.

The scintillation-type detector is commonly used in today's CT scanner.

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

The composite electrical signal based on transmission values is the

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

Which of the following is used to trigger a message when cumulative dose at a location,plus the dose for the next planned and confirmed scan(s),is likely to exceed a pre-programmed value?

The Z axis for CT scanning goes from

Using a larger matrix or thinner slice will reduce the

The smallest component of the matrix is the

Most modern CT scanners are based on _______________________ technology.

Because of the minimal amount of scatter radiation produced during a CT scan,there is no need to be concerned with the protection of others who must remain in the room during a CT scan.

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 formula for dose length product (DLP)is

A pitch of 1 indicates that with each rotation of the tube

Automatic tube current modulation is a method

Image postprocessing results in the image data changing.

The CT gantry houses the

Which of the following measures mean absorbed dose in the scanned object volume,adjusted for weighted index and pitch in MSCT?

This shading artifact is due to the beam energy changing (and therefore the CT numbers)as the beam passes through the anatomy

Pitch ranges from

The collimator that improves image contrast by limiting the amount of scatter radiation that reaches the detector is the

The DAS receives an electrical signal from the detector-photodiode.

The scintillation-type detector is commonly used in today's CT scanner.

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

The composite electrical signal based on transmission values is the

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

Which of the following is used to trigger a message when cumulative dose at a location,plus the dose for the next planned and confirmed scan(s),is likely to exceed a pre-programmed value?

The Z axis for CT scanning goes from

Using a larger matrix or thinner slice will reduce the

The smallest component of the matrix is the

Most modern CT scanners are based on _______________________ technology.

Because of the minimal amount of scatter radiation produced during a CT scan,there is no need to be concerned with the protection of others who must remain in the room during a CT scan.

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