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

High yield radiology physics past paper questions with video answers
Perfect for testing yourself prior to your radiology physics exam 👇

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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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Not sure if the question banks are for you?
If you're here, you're likely studying for a radiology physics exam. I've spent the last few months collating past papers from multiple different countries selecting the most commonly asked questions. You'll be surprised how often questions repeat themselves!

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.

Happy studying,
Michael

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