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MRI Artifacts Flashcards

6 cards from real MRI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 MRI Artifacts flashcards as text

  1. Which of the following is the most effective method to reduce motion artifact from bowel peristalsis in abdominal MRI?

    Answer: Administer an antiperistaltic agent such as glucagon

    IV or IM glucagon inhibits smooth muscle contraction (antiperistaltic effect), reducing bowel motion artifact during abdominal MRI acquisitions.

  2. Susceptibility-weighted imaging (SWI) is particularly sensitive to which types of tissue or substances?

    Answer: Blood products (hemosiderin, deoxyhemoglobin), calcium, and iron-containing structures

    SWI exploits magnetic susceptibility differences between tissues; hemosiderin, deoxyhemoglobin, calcium, and iron create local field distortions that appear as marked hypointensity on SWI images.

  3. Which of the following maneuvers most directly reduces chemical shift artifact of the first kind?

    Answer: Increase receiver bandwidth

    Increasing the receiver bandwidth reduces the chemical shift displacement (measured in pixels) between fat and water signals along the frequency-encode direction.

  4. A 'corduroy' or 'herringbone' artifact covering the entire image is most often caused by:

    Answer: A spike (impulse noise) in k-space

    A single corrupted point (spike) in k-space Fourier-transforms into a sinusoidal wave overlaid across the entire image, producing a corduroy or herringbone pattern.

  5. In which direction does the chemical shift type 2 (India ink) artifact appear at fat-water interfaces, and on which sequence type is it seen?

    Answer: Phase direction on gradient-echo sequences

    Chemical shift type 2 (India ink or black boundary artifact) occurs in gradient-echo sequences at fat-water voxel boundaries and appears as a dark rim at these interfaces.

  6. Cardiac MRI uses which technique to synchronize data acquisition with the cardiac cycle and minimize cardiac motion artifact?

    Answer: ECG gating or cardiac triggering

    ECG gating (prospective triggering or retrospective gating) synchronizes k-space acquisition to specific phases of the cardiac cycle, minimizing motion artifact from myocardial contraction.