The best and most easily understood of all the numerous MRI lectures. Thank you Sir Paul Callaghan.

Thank you SO MUCH Dr. Callaghan! I have been struggling to understand the concepts behind NMR for a while now and have not been able to find a simple, clear explanation of the basic physics behind NMR until now. Your videos are amazing and make a very complicated and difficult to understand concept much easier to grasp!

This is an amazing video where such a complex concept is taught in such simple terms. Prof. Callaghan you are a star.

I was just looking for more videos about NMR after viewing this wonderful series when I saw that Sir Paul Callaghan had died of cancer a few months ago. What a shame. This amazing man has helped me, and from the looks of things, about a hundred thousand other people all around the world understand NMR much better than I had before. I have no doubt that he will help millions more in the future. RIP Dr. Callaghan.

RIP Paul Callaghan. Thank you for these videos, great help!

Thanks a lot Paul, you are a very good teacher. videos like this make youtube so great. Greetings from Germany

Dr. Callaghan; You are the world's greatest lecturer! Can't wait to see the rest of your videos!

You sir... are a genius!

It is really the best online videos series of NMR I´ve watched, congratulations. Finally I´ve understood relaxation times: T1, T2 and T2*!

My goodness! After hours of trying to grapple with MRI, this is so simple to understand because it's explained so well.

I'm so glad I stumbled in to you and your videos. I'm an MRI Tech and this video was so easy to grasp and understand. I understand how it works but the way you explained and demonstrated precession and resonance is so easy to understand. Thank you and will view the rest of the videos.

oh, thank you, i'm studying for my medical imaging exam this morning. this video helped a lot. i understood the basics. great job

@5:19 A beautiful explanation easy to understand and remember. @ 6:10 (he left out) the stimulus field is very small compared to strength of the static field.

THANK YOU SO MUCH!!! That was a great and clear explanation of NMR.

A very didactic demonstration, thanks for sharing your knowledge!

Thank you so much for uploading this, it really helps me to understand NMR and MRI.

That was truly excellent and very easy to follow! Thank you very much!

This is a beautiful presentation. Excellent explanation of precession and resonance.

I'm going to do my reexam on Friday, so I'm going to watch all your video's. :) Thus far they are very helpful. I've seen yours on T1 and T2 and T2* before, it was the only explanation that made me understand the concepts!

Thanks a lot ,very good demonstration.

excellant demostration You made the concepts seem simple Thank You

Dr. Callaghan the best!

Thank you so much for this genius explanation!!! OMG that explains A LOT!

Thank you for the demonstration as I am taking MRI this Spring 2013.

Excellent Paul..thanks for sharing this

Awesome sir...the concept u have explained so nicely by demonstrating with the help of wheels, probe etc are amazing.. these concepts are very difficult to get by going through the books...almost i have watched all your videos...each professor should demonstrate the same way......!!!! thank you so much sir...!!! :)

Beautiful explanation...thanks a lot for the video!!

Thanks a lot. I am trying to understand NMR just because it fascinated me, and i think i have the initial grasp

Thank you for the wonderful lecture!

amazing, thank you for making these videos!

Thanks a lot Dr Paul Callaghan for this explanation.. :D

Thank you so Much Professor for nice illustration

Excellent and great video

so helpful for learning MRI basics!

truly helpful

Truly excellent

thank you

Very helpful! Thank you

Thank you for your explanation

Thanks so much, this is great :)

great!

Thank you so much! My textbook makes this so much harder to understand.

Genius!!!!! thanks a lot!!!!!

wow, where have you been all semester?

thank you doc

Oh thanks a lot! I'll try to translate it in russian and retell&demonstrate it to my friends.

wish that i had seen this as an undergrad. I struggled to understand nmr at the time.

x1000 thumbs up