MRI Physics | Magnetic Resonance and Spin Echo Sequences - Johns Hopkins Radiology

Don’t fret about learning MRI Physics! Join our proton buddies on a journey into the MR scanner's magnetic field, where they encounter radiofrequency pulses, generate echos, and combat T2* effects! We take it back to basics, focusing on the fundamentals of magnetic resonance and reviewing the components of a simple spin echo sequence.

Video Outline:

0:00 Introduction
0:10 Protons
0:43 Magnetic fields
1:18 Precession, Larmor Equation
1:56 Radiofrequency pulses
3:00 Protons will be protons
3:45 Spin echo sequence
5:00 T1 and T2 time
5:51 Free induction decay
6:28 T2* effects
7:02 T2* effects (the distracted children analogy)
8:23 Spin echo sequence overview

Animation by Emily Wu, MA
Script and Narration by Erin Gomez, MD
Special thanks to the Johns Hopkins University DELTA Grant

[michaelblankenau]

The people who designed and engineered MRIs are geniuses . All these analogies don’t scratch the surface on the deep understanding one must have to make sense of this technology.

[hermanyuen]

Please do more of these videos to explain other MRI sequences. Your analogies made the concepts so much more easier to understand! Please keep up the good work.

[ThamizhanDaa]

This video is soo good. Like my professor tried explaining this over 3 lectures, but I didn't understand. This video made it so crystal clear. Well Done!!

[jjajja-]

What a PERFECT explain it is!! I’m a student studying MRI in South korea where there are a lot of headmasters who lecture MRI poorly… Thank you for your high quality video and I’ll come back when I need your help thanks a lot!!

[supaahflyy]

Explanation 10/10
Video 10/10

This is how you learn things. Use of analogies and clear cartoon videos. This video not only taught me the basics of MRI but it has taught me how i learn best rather than just read words in a textbook

[common]

I was struggling to understand the spin echo sequence with the complicated formulas taught in class, but this just made my day :) So easy to understand with the super cute animations! Thank you sooo much!!

[easyMRI]

The best explanation of the MRI basics ever!!!

[thadreimagined]

You brought me back from the brink of panic. Thank you.

[daltonbryer]

Huge help thanks nobody ever explains what axis things are spinning in. Please make more of these!

[edwardhayes]

That was incredible. I loved that you still used useful analogies for such a complex topic.

[renukakadu]

BEST VIDEO ON MRI AND NMR. I have been trying to understand this concept for hours. I have a much more clear understanding now. Thank Youuuu!

[shujatali]

Super, can't have a better explanation than this. Amazing

[MrTian]

Please keep more coming!! This is so good!

[x__]

At 1:58 in the video, the explanation was well done and allowed me to grasp the principles behind SPIN UP and SPIN DOWN effectively.

[diegosoriavivas]

What an amazing job you have done! Thank you so much! This is a phenomenal video. You made this very easy to understand.

[heddaisbingingyoutube]

I am amazed over how much more understandable this concept just became, with your illustrations and great explanations. Thank you so much!!

[subiraa]

Brilliant! Simply brilliant! Please make more videos like this, Dr. Erin Gomez and Emily Wu!

[dinaalmiari]

great video ! just summarized 105 slides of MRI in 10 minutes . Thank you

[hollumsss]

Is there a second video yet? Thank you!! This is very informative

[trentmccauley]

Needed to learn MRI basics quickly, and this was perfect. Thanks so much!!!