Question 1

The patient must be centered in the CT gantry isocenter for accurate imaging of the anatomy.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following is true concerning dual source CT units?

Accepted Answer

A)  Dual source CT units contain two sets of tube-detector pairs. 
B)  Dual source CT units have quicker scan time. 
C)  Dual source CT units require less patient dose due to their design. 
D)  Dual source CT units have better ability to differentiate between tissues than standard MSCT. 
E)  All of these. 
A)  Dual source CT units contain two sets of tube-detector pairs. 
B)  Dual source CT units have quicker scan time. 
C)  Dual source CT units require less patient dose due to their design. 
D)  Dual source CT units have better ability to differentiate between tissues than standard MSCT. 
E)  All of these.

Question 3

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 4

This is the only generation of CT scanners that used parallel-beam geometry.

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 5

Hounsfield unit is another name for the CT number.

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

Adding a printed comment or label to the image is

Accepted Answer

A)  annotation 
B)  windowing 
C)  ROI 
D)  MPR 
A)  annotation 
B)  windowing 
C)  ROI 
D)  MPR

Question 8

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

Question 9

As the WL changes, the CT image's

Accepted Answer

A)  contrast changes 
B)  brightness changes 
C)  spatial resolution changes 
D)  distortion changes 
A)  contrast changes 
B)  brightness changes 
C)  spatial resolution changes 
D)  distortion changes

Question 10

Scan time remains constant for all CT studies.

Accepted Answer

A) True 
 B)False

Question 11

To visualize tissues that are very similar to each other, the

Accepted Answer

A)  WW should be narrow 
B)  WW should be wide 
C)  WL should be low 
D)  WL should be high 
A)  WW should be narrow 
B)  WW should be wide 
C)  WL should be low 
D)  WL should be high

Question 12

Metal in the area being imaged 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 13

Spiral scanning collects data for

Accepted Answer

A)  one slice at a time 
B)  5-10 slices at a time 
C)  the entire volume of tissue being imaged 
D)  none of these 
A)  one slice at a time 
B)  5-10 slices at a time 
C)  the entire volume of tissue being imaged 
D)  none of these

Question 14

The result of changing window level and width of the CT image is that the image data has been permanently changed.

Accepted Answer

A) True 
 B)False

Question 15

Electron-beam computed tomography (EBCT) was developed to be fast enough to image the

Accepted Answer

A)  lungs 
B)  heart 
C)  diaphragm 
D)  skull 
A)  lungs 
B)  heart 
C)  diaphragm 
D)  skull

Question 16

The DAS is located

Accepted Answer

A)  just below the couch 
B)  inside the x-ray tube 
C)  within the gantry 
D)  in the central processing unit 
A)  just below the couch 
B)  inside the x-ray tube 
C)  within the gantry 
D)  in the central processing unit

Question 17

Another name for the CT table is the

Accepted Answer

A)  gurney 
B)  couch 
C)  board 
D)  stretcher 
A)  gurney 
B)  couch 
C)  board 
D)  stretcher

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

Pediatric protocols are unnecessary because the equipment will always adjust for the smaller patient size.

Accepted Answer

A) True 
 B)False

Question 20

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

The patient must be centered in the CT gantry isocenter for accurate imaging of the anatomy.

Which of the following is true concerning dual source CT units?

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

This is the only generation of CT scanners that used parallel-beam geometry.

Hounsfield unit is another name for the CT number.

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

Adding a printed comment or label to the image is

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?

As the WL changes, the CT image's

Scan time remains constant for all CT studies.

To visualize tissues that are very similar to each other, the

Metal in the area being imaged produces a

Spiral scanning collects data for

The result of changing window level and width of the CT image is that the image data has been permanently changed.

Electron-beam computed tomography (EBCT) was developed to be fast enough to image the

The DAS is located

Another name for the CT table is the

The smallest component of the matrix is the

Pediatric protocols are unnecessary because the equipment will always adjust for the smaller patient size.

Most modern CT scanners are based on _______________________ technology.

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 patient must be centered in the CT gantry isocenter for accurate imaging of the anatomy.

Which of the following is true concerning dual source CT units?

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

This is the only generation of CT scanners that used parallel-beam geometry.

Hounsfield unit is another name for the CT number.

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

Adding a printed comment or label to the image is

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?

As the WL changes, the CT image's

Scan time remains constant for all CT studies.

To visualize tissues that are very similar to each other, the

Metal in the area being imaged produces a

Spiral scanning collects data for

The result of changing window level and width of the CT image is that the image data has been permanently changed.

Electron-beam computed tomography (EBCT) was developed to be fast enough to image the

The DAS is located

Another name for the CT table is the

The smallest component of the matrix is the

Pediatric protocols are unnecessary because the equipment will always adjust for the smaller patient size.

Most modern CT scanners are based on _______________________ technology.

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