Chemical Shift Artifact MRI | MRI Physics Course #14

High yield radiology physics past paper questions with video answers
Perfect for testing yourself prior to your radiology physics exam 👇
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Today we will look at chemical shift and the chemical shift artifact. Chemical shift refers to the difference in processional frequencies between hydrogen atoms in water and fat. These differences are due to the slight differences in atomic level magnetic field strengths.
The chemical shift artifact is the artifact seen when fat is misregistered (predominantly in the frequency encoding direction) due to the slight difference in processional frequencies between water and fat. We will see how magnetic field strength, bandwidth and matrix size all affect chemical shift artifact and the trade-offs that changing these artifacts has on image quality.
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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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[@alexanderchoi4502]

You're saving me from this god awful final on MR keep up your work!!

[@nurankhattab]

Thank you so much. Also, it would be great to tell us how you make this stunning visualization?

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Amazing lectures, thank you very much
i am waiting the lectures like CT scan and fluoroscopy if that possible

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that is incredible, thank you so much

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Thank you!

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Nice courses for a new learner like me. thank you very much, dr!

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Thankyou micheal🎉

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Thankyou micheal

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You are doing a great job. The best in TH-cam. Is it maybe possible, that you also make a video about temporal bone/ ear anatomy on CT/MRI? Thank you and lots of love from Vienna ☺️

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Thank you. I'm planning an anatomy series for the end of the year. Will definitely have temporal bone anatomy! All the best from South Africa

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Colon or large intestine ulcers can be seen in MRI?

[@gowthamrm414]

Will MRI MCQ’s available before autumn frcr exam?

[@hossam_elmahallawy]

Does increase FOV reduce ch. Shift artefact?

[@edwardshih5254]

After watching this episode, I think there's a problem at 17:35
"How do we increase the range of frequencies? We increase the gradient field strength."
However if we increase the gradient, the frequency difference between water and fat will also increase, right?
So maybe it's not a proper way to increase bandwidth by increasing the gradient in this case?

[@johnhans7403]

I believe the gradient is much smaller than B0, (like mT compared to T) and its effect on the rate of change of precession frequency between fat and water is negligible. However, it is much more “effective” in changing the spectrum of frequencies represented by each pixel, and therefore reducing the artifact. Correct me if I’m wrong it’s just my take on it.

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Thankyou sir🎉

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Thankyou sir

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Pleasure Sohail 🙂

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Any time! 🙂