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Quiz

Image Production Quick Quiz 1

Image Production Quick Quiz 1

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Question 1 of 19

1. Question
Patient motion results in ____________ in the CT image.

1. Ghosting

2. Blurring

3. Streaks
- 1 only
- 2 only
- 3 only
- 1, 2, and 3
Correct

Incorrect
Question 2 of 19

2. Question
As slice thickness is decreased, which of the following statements is true?
- An increase in both partial volume artifacts and edge gradient artifacts.
- An increase in partial volume artifacts and a decrease in edge gradient artifacts.
- A decrease in both partial volume artifacts and edge gradient artifacts.
- A decrease in partial volume artifacts and an increase in edge gradient artifacts.
Correct

Incorrect
Question 3 of 19

3. Question
To reduce the effect of partial volume artifact in a CT image while not increasing the appearance of noise, which of the following could be used?
- Decrease the slice thickness and increase mAs
- Increase the slice thickness and decrease kVp
- Decrease the slice thickness and decrease mAs
- Increase the slice thickness and increase mAs
Correct

Incorrect
Question 4 of 19

4. Question
A variation in which of the following factors will affect the hardening of the CT x-ray beam?

1. Tissue density

2. kVp

3. Tissue thickness
- 1 only
- 2 only
- 3 only
- 1, 2, and 3
Correct

Incorrect
Question 5 of 19

5. Question
The direction in which the streaks from the edge gradient effect emanate in what orientation from the structure being imaged?
- Radiating outward from the center of the image.
- Perpendicular to the direction of the sharp density difference interface.
- Parallel to the direction of the sharp density difference interface.
- Both perpendicular and parallel to the direction o fthe sharp density difference interface.
Correct

Incorrect
Question 6 of 19

6. Question
The CT image of the brain exhibiting a cupping artifact will appear brighter…
- In the center of the brain
- At the anterior and posterior areas of the brain
- At the periphery of the brain
- Immediately around dense structures
Correct

Incorrect
Question 7 of 19

7. Question
Partial volume averaging may result from which of the following?

1. Lack of sharpness of edges

2. Inaccurate CT numbers

3. Ghosting of tissue boundaries
- 1 only
- 2 only
- 1 and 2 only
- 3 only
Correct

Incorrect
Question 8 of 19

8. Question
Which of the following best describes a CT artifact?
- A problem that always requires repair of the CT scanner.
- Injection timer used for contrast media.
- An anomaly in the CT image.
- A parameter used by the technologist to control image brightness.
Correct

Incorrect
Question 9 of 19

9. Question
The greatest amount of partial volume artifact would be displayed in which of the following?
- 5mm slice width used in a 20 slice study
- 10mm slice width used in a 20 slice study
- 5mm slice width used in a 40 slice study
- All of the above would result in the same amount of partial volume artifact
Correct

Incorrect
Question 10 of 19

10. Question
When scan time is decreased:
- Motion artifacts are always decreased
- Motion artifacts are always increased
- Does not affect motion artifacts
- Usually decreases motion artifacts, but sometimes increases motion artifacts
Correct

Incorrect
Question 11 of 19

11. Question
The appearance of tube arcing on the CT image might result in…
- A star-like artifact around the edge of the image.
- Shading and inaccurate CT numbers
- The appearance of a circle or ring
- An increase in the appearance of noise in the CT image.
Correct

Incorrect
Question 12 of 19

12. Question
Beam hardening can produce which of the following?

1. Broad streaks in the image

2. Inaccuracies in the CT number

3. Cupping artifact
- 1 only
- 2 only
- 3 only
- 1, 2, and 3
Correct

Incorrect
Question 13 of 19

13. Question
Which of the following scan parameters will produce a CT image with the least amount of edge gradient artifacts?
- Full scan using thick slice width
- Full scan using thin slice width
- Partial scan using thick slice width
- Partial scan using thin slice width
Correct

Incorrect
Question 14 of 19

14. Question
If the filter at the aperture of the x-ray tube removed even more low energy x-ray photons which of the following would result?
- An increase in partial volume artifacts.
- A decrease in partial volume artifacts.
- An increase in beam hardening artifacts.
- A decrease in beam hardening artifacts.
Correct

Incorrect
Question 15 of 19

15. Question
The cause of the cupping artifact is?
- The tissues of the body attenuate low energy photons.
- The different densities between tissues causes the high energy photons to be absorbed.
- The mean energy of the photons that comprise the x-ray beam is lowered.
- The central tissues are over penetrated by the x-ray beam.
Correct

Incorrect
Question 16 of 19

16. Question
CT images can be directly scanned in planes other than transverse and can be acquired by orienting the patient’s body part so that it is not perpendicular to the x-ray beam.
- true
- false
Correct

Incorrect
Question 17 of 19

17. Question
Which of the following will reduce the appearance of noise in the CT image.

1. Use of a wide window width

2. Increase in mAs

3. Increase in slice thickness
- 1 only
- 2 only
- 3 only
- 1, 2, and 3
Correct

Incorrect
Question 18 of 19

18. Question
Which of the following will most likely remove a ring artifact?
- Increase in mAs
- Decrease in matrix
- Recalibrate the detector elements
- Remove metal objects from the patient
Correct

Incorrect
Question 19 of 19

19. Question
An artifact from a faulty detector would appear on a localizer image as…
- A black line throughout the image, parallel to the long axis of the patient table
- A black line perpendicular to the long axis of the patient table
- Dependent upon the orientation in which the localizer image is performed
- A black circle will be in the center of the image
Correct

Incorrect

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