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Questions and Answers
Which MRI technique does not require contrast media?
Which MRI technique does not require contrast media?
- Pre-saturation MRA
- Phase Contrast MRA
- TOF MRA (correct)
- Contrast-enhanced MRA
What effect does pre-saturation have on longitudinal spins in TOF MRA?
What effect does pre-saturation have on longitudinal spins in TOF MRA?
- Causes loss of signal in longitudinal spins (correct)
- Reverses the magnetization of longitudinal spins
- Has no effect on longitudinal spins
- Increases signal in longitudinal spins
In TOF MRA, how are the slices oriented with respect to the flow direction?
In TOF MRA, how are the slices oriented with respect to the flow direction?
- At a 45-degree angle to flow direction
- Parallel to flow direction
- Randomly oriented with respect to flow direction
- Perpendicular to flow direction (correct)
What property of blood flow can be quantified in Phase Contrast MRA?
What property of blood flow can be quantified in Phase Contrast MRA?
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What is the purpose of bipolar gradients in Phase Contrast MRA?
What is the purpose of bipolar gradients in Phase Contrast MRA?
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