How MRI Works - Part 2 - The Spin Echo

How MRI works - Part 2: The Spin Echo.

Slides can be purchased here:

0:00 - Intro
0:26 - What is Boltzmann Magnetization?
4:17 - Recap of the NMR Experiment and NMR Signal
7:04 - Clarification of Spin vs Ensemble Moments
8:42 - NMR Experiment Transmission (Tx) and Reception (Rx)
11:10 - Performing the NMR Experiment
13:07 - Two spins in different fields and T2*
16:09 - Larmor Distributions, Stacked spin dephasing and T2
19:23 - Transverse Magnetization M(t) and Frequency Distributions f(w)
25:00 - Larmor Distributions, Stacked spin dephasing and T2
27:43 - T2 vs T2* decay in Tissue
30:03 - Recap and Intro to the Spin Echo
30:49 - The Spin Echo Experiment
33:18 - Explanation of the Spin Echo
35:04 - Echo phase and Echo Math
37:14 - Conclusion and Exercises
38:11 - Outro

Drinking game: Take a drink every time I say "dramatically/substantially/drastically/ reduced".

[thepirl]

Error Correction:
13:30 - The units of gyromagnetic ratio are rad/s/T (I forgot a 'per second' in my slide). Note that the 'MHz/T' unit is fine though.

[yyyyyyyyyz]

2 years later! I wasn't sure if part 2 would ever be published, but am happy to see it. Thanks for the great explanations!

[BryanQ]

This absolute mad man delivers almost 3 years later. Excellent videos btw, I'm excited for part 3!

[Aphelia.]

Can't wait for the part 3 coming in 2023

[pennypaul]

I started watching this series with zero knowledge of MRI physics. A year later during my MSc, man delivers. Great timing and great delivery! The animations are topnotch and the humour makes it even more fun. 🙌🏾

[andrewgerry]

I feel like these are the only super in-depth and or mathematical based videos worth watching on this platform for MRI physics. What is your background or expertise in? are you a diagnostic medical physicist?

[finanzasypersonas]

This is absolutely awesome. I just started my Ph.D. working with NMR and this information is absolutely worthy. Congratulations!!!

[jacobharris]

33:20 This finally made the relationship between the Free Induction Decay, the spin echo and graphs I have from my NMR lab come together for me. Thank you so much for this. I've been struggling to grasp this concept for a while.

[nigeriantvc]

This is the Best video lecture i ever watch on YouTube. I have been waiting for this 2nd part for more than a year. Thanks so much for this amazing great job Sir
💪🙌👏

[alop]

The Best, by far, the Best MRI video explanation series on internet. Excellent content.

[HiteshPatel-ybjc]

Like others I was waiting expectantly for Part II, and now .... for Part III and IV! Aside from the information, we can also admire the production. Thank you.

[jupa]

Subscribed "just in case" - yay! Second part of the best mri explanation on youtube! Thank you!

[ruenjou]

I'm glad I found this video yesterday; no need to wait for 2 years to see them all.

[lexinwonderland]

I am so glad you're making this series-- please, please, PLEASE keep it up!!! I found you thru SoME2, but my primary focus is neuro-focused biochemistry, and getting a math based explanation to how the imaging works is so wonderful!! you've made me significantly more interested in radiology from your three videos alone!

[AlexM-pukb]

A fantastic video series that I wish to see continued!
Great explanations and even greater animations that truly make a difference to understand. Most of the videos out here are hard to follow due to lacking animations. This helps immensely and I cannot thank you enough and appreciate the work you put in this. Please do continue, I cannot wait for the next parts!


Also, do you - or anyone else here - has a book recommendation for MR-Physics? Looking for one that also explains different sequences like TOF, FLAIR, CEST etc. Thanks!

[plusleo]

Brilliant lecture. Full respect for your hard work to deliver knowledge to us.

[kerryl]

Man, I cannot wait for Part 3 - I want to smart right now, haha! I appreciate how time consuming these videos must be to make with all the graphics and animations, and its because of the graphics and animations that make your explanation of the concepts so much more understandable than textbooks or traditional lectures - thank you!

[camicanu]

Can't wait for next part coming! This lectures are pure gold

This is hands down the BEST explanation of the spin echo

[anielaadamus]

Thank you so much for coming back with Part 2! As someone with zero medical knowledge and minimal physics background I'm finding these super clear and easy to understand! I needed a clear review of NMR principles for borehole logging applications and you videos definitely deliver :) Don't think I'll live long enough to see Part 3 and 4 though... a bit jealous of people who find your videos in the future when all parts are out haha