Podcast
Questions and Answers
Which artifact occurs when anatomy outside the FOV is folded onto the top of anatomy inside the FOV?
Which artifact occurs when anatomy outside the FOV is folded onto the top of anatomy inside the FOV?
- Appearance Aliasing (correct)
- Signal distortion
- Frequency wrap
- Phase wrap
What causes appearance aliasing?
What causes appearance aliasing?
- Undersampling of data
- Frequency encoding
- Signal distortion
- Gradients (correct)
What is the term for aliasing along the frequency encoding axis?
What is the term for aliasing along the frequency encoding axis?
- Signal distortion
- Frequency wrap (correct)
- Appearance Aliasing
- Phase wrap
What happens when the FOV is smaller than the anatomy in the frequency direction of the image?
What happens when the FOV is smaller than the anatomy in the frequency direction of the image?
What is the term for aliasing along the phase axis of the image?
What is the term for aliasing along the phase axis of the image?
What causes phase wrap?
What causes phase wrap?
What happens when the FOV in the phase encoding axis is smaller than the dimensions of the abdomen?
What happens when the FOV in the phase encoding axis is smaller than the dimensions of the abdomen?
What frequencies are accurately digitized in the FOV?
What frequencies are accurately digitized in the FOV?
What happens to frequencies outside the FOV that exceed the Nyquist frequency?
What happens to frequencies outside the FOV that exceed the Nyquist frequency?
What is the term for the artifact where anatomy outside the FOV is folded onto the top of anatomy inside the FOV?
What is the term for the artifact where anatomy outside the FOV is folded onto the top of anatomy inside the FOV?
Which technique is used to eliminate aliasing in the frequency direction?
Which technique is used to eliminate aliasing in the frequency direction?
What is the purpose of using presaturation bands?
What is the purpose of using presaturation bands?
What is the term used to describe antialiasing along the phase axis?
What is the term used to describe antialiasing along the phase axis?
How does increasing the number of phase encodings steps compensate for aliasing along the phase axis?
How does increasing the number of phase encodings steps compensate for aliasing along the phase axis?
What can happen if the volume imaging does not include all of the anatomy lying outside the region under investigation?
What can happen if the volume imaging does not include all of the anatomy lying outside the region under investigation?
How is aliasing in the frequency direction eliminated?
How is aliasing in the frequency direction eliminated?
What is the effect of enlarging the FOV to compensate for aliasing along the phase axis?
What is the effect of enlarging the FOV to compensate for aliasing along the phase axis?
What is the purpose of antialiasing software methods?
What is the purpose of antialiasing software methods?
What is the term used to describe aliasing along both the frequency and phase axes?
What is the term used to describe aliasing along both the frequency and phase axes?
What happens when aliasing occurs in the slice-select direction in volume imaging?
What happens when aliasing occurs in the slice-select direction in volume imaging?
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