Gradient moment nulling ______. (select all that apply)

Produces bright signal from flowing nuclei

Reduces ghosting caused by flowing nuclei moving along gradients

Increases ghosting caused by flowing nuclei moving along gradients

Produces dark signal from these flowing nuclei

Artifacts that can occur in images are caused by all of the following except:

Incorrect signal received (interference)

System errors (image reconstruction errors)

ROPE is a respiratory compensation method. What does ROPE stand for?

Respiratory ordered phase encoding

Respiratory open phase encoding

Physics 2 Quiz 2.1

15 Questions | By Breanna | Updated: Mar 20, 2022 | Attempts: 47

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1.

To reduce truncation artifact, decrease phase encoding steps from 256 to 128.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False
2.

To reduce phase mismapping, the direction of the phase encoding gradient can be changed to get rid of the artifact interfering with the area of interest. This is know as:
- A.
  
  Out of phase artifact
- B.
  
  Wrap around
- C.
  
  Chemical shift artifact
- D.
  
  Swapping phase and frequency
Correct Answer
D. Swapping phase and frequency
3.

Frequency Wrap-Around is improved by using a larger FOV or oversampling
- A.
  
  True
- B.
  
  False
Correct Answer
B. False
4.

No phase wrap over-samples along the phase encoding axis by increasing number of phase encodings performed. This is achieved by enlarging the FOV in phase-direction so phase curve extends over a wider area of anatomy.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True
5.

Phase mismapping or ghosting - produces replications of moving anatomy across the image in the frequency
- A.
  
  True
- B.
  
  False
Correct Answer
B. False
6.

The 2 forms of gating are: (select all that apply)
- A.
  
  ECG
- B.
  
  Pulsation
- C.
  
  Peripheral
- D.
  
  ECH
- E.
  
  Black box
Correct Answer(s)
A. ECG
C. Peripheral
7.

Aliasing or wrap around produces images where anatomy that exists outside the FOV is folded onto the top of anatomy inside the FOV.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True
8.

Gradient moment nulling ______. (select all that apply)
- A.
  
  Increases ghosting caused by flowing nuclei moving along gradients
- B.
  
  Produces bright signal from flowing nuclei
- C.
  
  Reduces ghosting caused by flowing nuclei moving along gradients
- D.
  
  Produces dark signal from these flowing nuclei
Correct Answer(s)
B. Produces bright signal from flowing nuclei
C. Reduces ghosting caused by flowing nuclei moving along gradients
9.

Which of the following are ways to prevent phase wrap artifact? (select all that apply)
- A.
  
  PreSat Band
- B.
  
  Increase Bandwidth
- C.
  
  Oversampling
- D.
  
  Decrease Slice Thickness
- E.
  
  Increase the Matrix
- F.
  
  Use a Bigger Coil
- G.
  
  Increase FOV
Correct Answer(s)
A. PreSat Band
C. Oversampling
G. Increase FOV
10.

Cardiac gating uses a set of bellows around the patient's chest which expand and contracts when imaging the chest or abdomen.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False
11.

Artifacts that can occur in images are caused by all of the following except:
- A.
  
  Incorrect signal received (interference)
- B.
  
  Computer errors
- C.
  
  Spatial localization errors
- D.
  
  System errors (image reconstruction errors)
Correct Answer
B. Computer errors
12.

ROPE is a respiratory compensation method. What does ROPE stand for?
- A.
  
  Respiratory ordered phase encoding
- B.
  
  Respiratory open phase encoding
- C.
  
  Rapid ordered phase encoding
- D.
  
  Real ordered phase encoding
Correct Answer
A. Respiratory ordered phase encoding
13.

Phase mismapping is caused by anatomy moving along the phase encoding gradient during the pulse sequence.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

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Mar 20, 2022

Quiz Edited by
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Jun 05, 2017

Quiz Created by
Breanna

Physics 2 Quiz 2.1

To reduce truncation artifact, decrease phase encoding steps from 256 to 128.

To reduce phase mismapping, the direction of the phase encoding gradient can be changed to get rid of the artifact interfering with the area of interest. This is know as:

Frequency Wrap-Around is improved by using a larger FOV or oversampling

No phase wrap over-samples along the phase encoding axis by increasing number of phase encodings performed. This is achieved by enlarging the FOV in phase-direction so phase curve extends over a wider area of anatomy.

Phase mismapping or ghosting - produces replications of moving anatomy across the image in the frequency

The 2 forms of gating are: (select all that apply)

Aliasing or wrap around produces images where anatomy that exists outside the FOV is folded onto the top of anatomy inside the FOV.

Gradient moment nulling ______. (select all that apply)

Which of the following are ways to prevent phase wrap artifact? (select all that apply)

Cardiac gating uses a set of bellows around the patient's chest which expand and contracts when imaging the chest or abdomen.

Artifacts that can occur in images are caused by all of the following except:

ROPE is a respiratory compensation method. What does ROPE stand for?

Phase mismapping is caused by anatomy moving along the phase encoding gradient during the pulse sequence.