MRI Scan Animation : How magnetic resonance imaging works

This animation explains how a MRI scan is obtained. It covers how the magnetic resonance signal is produced and detected in the body using powerful magnets and radiofrequency pulses. The role of key components (magnets, gradient coils, and RF coil) are linked to the processes taking place in the body. The animation explains how the MRI signal is localised in image slices of the body using gradient coils. Methods of detecting tissue contrast are introduced, though not explained in detail since the aim of this animation is to introduce the primary concepts of producing an image (proton density, transverse relaxation time, RF pulse sequences and delayed application of localisation fields).
A link to a free quiz on the content of the video is shown at 7:59. Test yourself and check you grasped the main points.
Need to go deeper? Buy the textbook - now available on iBooks and Google Play at a great introductory price - find out more: physicshq.wixsite.com/alevelp...
Relevant concepts: nuclear magnetic resonance imaging, protons, precession, Larmor frequency, magnetic field strength, relaxation, phase, transverse and longitudinal vectors, e.m.f., induction and Fourier transformations.
Essential learning for A-Level physics, and medical physics courses at university.
OCR physics A, AQA A-Level physics, Edexcel A-Levrl physics

[@PhysicsHQ]

A link to a free quiz on the content of the video is shown at 7:59. Test yourself and check you grasped the main points.

[@RESISTAGE]

this one is the best explanation of how it works not what it does. thank you.

[@PhysicsHQ]

Thanks. Glad it helped! All the best.

[@Wutzmename]

The music is intense.

[@ahmedelgabry2780]

man how can such amazing and detailed animation go unseen like this this video is so underrated

[@PhysicsHQ]

Whoa - thanks for such amazing feedback! All the best with your studies.

[@karsangtamang9337]

Best channel ever visited... For 3 d animation and visualizations of concepts

[@PhysicsHQ]

Wow! 🤩 Thank you for your very kind words. All the best with your studies.

[@thisuserisdead9807]

I've been binge watching your videos and I have to say that I am very fond of the visuals to show the topic you are explaining. You gained a new subscriber, plus much love from a physics student

[@PhysicsHQ]

That’s amazing 🤩 Thanks for sharing your thoughts. Glad to have you on board! You might have been my 10,000ᵀᴴ subscriber.

[@alexsmith8863]

This blew my mind! Thanks so much, I really get the way it all works now.

[@PhysicsHQ]

Thanks! All the best.

[@ahmadbuz2010]

This is incredible.

[@PhysicsHQ]

Wow, thank you!! All the best for your studies and future.

[@olivianewtonjohn7778]

well was that detailed explanation so difficult to convey? Thank you for the best MRI video I have seen. What nearly a dozen videos together couldn't explain, you managed to do in one single video. Execellent to me, thanks again.

[@PhysicsHQ]

Wow 🤩. Thanks for taking the time to write. All the best.

[@yelectric1893]

I wish I could learn all about these physics and the wisdom in their application. Damn

[@yelectric1893]

I wonder how the receivers work

[@PhysicsHQ]

It works by the changing magnetic field inducing an emf in wires.

[@GranPaMark]

I just got one and I wanted to better understand the machinery. I am a student of physics, so your explanation was spot on for me. Thank you so much !

[@PhysicsHQ]

I’m glad to have helped! All the best.

[@sholohhh]

you got an mri machine????

[@someones_daughter_]

Like, for christmas or what?

[@MrHaluza]

great explanation and the music surprisingly fits very well, kudos for the quiz as well!!

[@PhysicsHQ]

Glad you liked it! Thank you for the feedback.

[@MsPringlz101]

After watching the video I took the quiz and got 13/20 and I know nothing about Physics. The video was detailed and informative.

[@PhysicsHQ]

💥 Amazing - well done you! Thanks for the feedback 🙏

[@felely]

music choice made me giggle but thank you for the informative comprehensive video!!

[@PhysicsHQ]

You're welcome! Sorry about the soundtrack.

[@kayk928]

I thought the gradient coils were located inside the MRI machine in solenoid form not to the side as shown in the video?

[@PhysicsHQ]

Yes that is correct. I was trying to represent the entire diagram somewhat schematically and partly realistically. The schematic representation was most important for my purpose of this video since I was trying to explain the principles under which MRI works. The gradient coils were represented in that way so that the diagram didn’t become too cluttered in that location.

[@shawnboushehri4357]

Interesting technology

[@Medical_Electronics_Horizon]

Good

[@edwardhughes352]

Blimey thats complicated. Whoever invented that is quite clever.

[@PhysicsHQ]

My thoughts exactly... well my thoughts were nearer "Whoever invented that is a legend!"

[@Medical_Electronics_Horizon]

Very Knowledgeble

[@PhysicsHQ]

Thanks so much. All the best with your studies.

[@amirhosain6026]

Very informative, tnx.

[@PhysicsHQ]

You are welcome 🙏 All the best

[@ericpham4011]

I thought inside a magnetic flux field, the small spin would turn field line into the sine wave or triple and a high resolution of MaD( magnetic anormality detection would synchronized to the tiny triple wave of each region and display as needed at any resolution. UN cosmetic operation, they super imposed the 3 d desired feature over region need fix and make any one look as young and beautiful or energetic with add on energizer driver

[@user-qi4uf5he1q]

Very good and informative explanation. I think I understood the first half. However, I found a typo, at 1:15, precession is around magnetic field lines, not gravitational field, right?

[@PhysicsHQ]

Thank you. Yes precession of nuclei in MRI is around magnetic field lines. At 1:15 I give an example of precessional motion that people are more likely to be familiar with - a spinning top which processes around gravitational field lines.

[@Heritage3911]

Is MRI based on getting things going and then turning things off? So if you turn one thing off you can get signal from proton precession going from IN phase to OUT of phase, but if you turn this other thing off you can get signal from the relaxation of the change in angular momentum of the precession itself, independent of phase. Is that what this is all about? And which one is T1 and which one is T2 again?

[@likequwei]

May I have questions: 1. Are the ranges of values of Bx and By same or very different? (If very different, 16 frequencies can be made at same time.

[@PhysicsHQ]

Hi. Sure thing. 1. Frequency changes are very small from one row to the next. 2. Yes I believe that is correct - one frequency is required per pixel of an image. The frequencies are transmitted simultaneously into the patient. The received signal requires the Fourier transform to separate out the individual signals for interpretation.

[@mohammadtalebi6647]

it was Great! how can we see the quiz results?

[@PhysicsHQ]

Thank you. When you complete the quiz you should be shown a button “Show Results” which takes you to a page to view results.

[@oliviaearnshaw5475]

the music makes this so funny

[@Wutzmename]

1.5 T is Tesla units?

[@PhysicsHQ]

That’s correct.

[@Wutzmename]

@@PhysicsHQ Thank you.

[@xClairy]

Did it just explain me physics...

[@PhysicsHQ]

Hopefully 🤞

[@davidmaddison2628]

Spoiled by shocking music. Can you do another one with a better soundtrack?

[@Journasa]

The music is horrible!!

[@md.abdullahmahmud]

too complicated to me. I didn't get it..

[@junzhao2221]

Horrible BGM

[@Alchemist_171]

didn't get shit