Aliasing (Wraparound) Artifact and Parallel Imaging in MRI | MRI Physics Course #13

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We've seen how selecting a specific bandwidth and field of view size determines the gradient field strength (in the frequency encoding direction) and delta k in the phase encoding direction. These field strengths determine the frequency changes in both the x and y axes.

Let's look at what happens if tissue extends beyond the predetermined FOV and we are unable to accurately sample these signals. This misrepresentation of the sampled signals will lead to an artifact known as aliasing or wraparound artifact.

Here we review what aliasing is, why it happens and what we can do to reduce or prevent it occurring.

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The types of questions asked in FRCR, RANZCR AIT, ARRT, FC Rad Diag (SA), ABR qualifying Core Physics and MICR part 1 are surprisingly similar and the key concepts remain the same throughout. I've taken the most high-yield questions and answered them in video format so that I can take you through why certain answers are correct and others are not.

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