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

Ғылым және технология

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.
Check out more educational resources for radiology residents and medical students at TeamRads.com
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

Пікірлер: 109

  • @michaelblankenau6598
    @michaelblankenau6598Ай бұрын

    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.

  • @x0xNOVAx0x
    @x0xNOVAx0x Жыл бұрын

    Animator is god.

  • @hermanyuen4046
    @hermanyuen4046 Жыл бұрын

    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.

  • @ThamizhanDaa1
    @ThamizhanDaa1 Жыл бұрын

    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!!

  • @pawanKumar-hp7zm

    @pawanKumar-hp7zm

    5 ай бұрын

    Ha

  • @Haru-xn6hy
    @Haru-xn6hy Жыл бұрын

    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!!

  • @thadreimagined9391
    @thadreimagined9391 Жыл бұрын

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

  • @common1028
    @common10283 ай бұрын

    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
    @easyMRI Жыл бұрын

    The best explanation of the MRI basics ever!!!

  • @daltonbryer3171
    @daltonbryer31719 ай бұрын

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

  • @shujatali642
    @shujatali642 Жыл бұрын

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

  • @edwardhayes5229
    @edwardhayes52294 ай бұрын

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

  • @subiraa814
    @subiraa8147 ай бұрын

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

  • @14renukakadu28
    @14renukakadu2811 ай бұрын

    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!

  • @diegosoriavivas
    @diegosoriavivas8 ай бұрын

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

  • @heddaisbingingyoutube
    @heddaisbingingyoutube4 ай бұрын

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

  • @MrTian1212
    @MrTian1212 Жыл бұрын

    Please keep more coming!! This is so good!

  • @ashidubey5225
    @ashidubey5225 Жыл бұрын

    This is hands down the best explanation i've seen for this..!!!!

  • @thabangmoarabi2419
    @thabangmoarabi2419 Жыл бұрын

    You are very comprehensive. Thank you.

  • @dinaalmiari264
    @dinaalmiari26411 ай бұрын

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

  • @TheLadyskittles
    @TheLadyskittles9 ай бұрын

    Best MRI video ever!!! Please make more of thesee

  • @Gealamusic
    @Gealamusic Жыл бұрын

    Thank you , this is so helpful, really impressive animation :O

  • @17x30__
    @17x30__4 ай бұрын

    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.

  • @sophiaramos770
    @sophiaramos7707 ай бұрын

    This is amazing!! I wish there were more videos

  • @REGINAESGUERRA
    @REGINAESGUERRA6 ай бұрын

    Thank you! Makes so much sense for a visual learner like me! Give the animator a big applause!

  • @appsenence9244
    @appsenence92448 ай бұрын

    Absolutely amazing video😊

  • @alerope6597
    @alerope65979 ай бұрын

    Thank you very much! It was really helpful. Keep up the good work!

  • @viktorgotz1098
    @viktorgotz1098 Жыл бұрын

    great explanation.. finally. Thank you so much!

  • @sehrishmomin865
    @sehrishmomin865 Жыл бұрын

    Excellent explanation

  • @akekalukardjnaphai464
    @akekalukardjnaphai464 Жыл бұрын

    Your video is very great. I’ve just understand what the multiple line symbol in phase diagram means.

  • @chuanwu6118
    @chuanwu61182 ай бұрын

    This is amazing!!!! Looking for more of these!

  • @saisrinivas3909
    @saisrinivas39097 ай бұрын

    Excellent animation and beautifully explained

  • @hollumsss
    @hollumsss Жыл бұрын

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

  • @ANASSBOUSSAIDA
    @ANASSBOUSSAIDA11 күн бұрын

    5:19 It's 37% not 63%, thank u for this great animation

  • @ellemargaret4529
    @ellemargaret45293 ай бұрын

    this video saved me!!! so clear, thank you

  • @larawagner2389
    @larawagner23897 ай бұрын

    Wow this is so good! We need more

  • @harammuneeb462
    @harammuneeb4628 ай бұрын

    Excellent description. 😁

  • @ashleynicoleg770
    @ashleynicoleg770 Жыл бұрын

    This is soooo good!

  • @mahima5402
    @mahima54029 ай бұрын

    beautiful video

  • @silviasansanocolomina9495
    @silviasansanocolomina9495 Жыл бұрын

    thank you so much! you are amazing!

  • @jawadalhajj6804
    @jawadalhajj6804Ай бұрын

    thank you for this great video

  • @amarshrivastava5363
    @amarshrivastava53636 ай бұрын

    Sublime Explanation!

  • @suomynonaanonymous
    @suomynonaanonymous11 ай бұрын

    fantastic explanation, wow!!!!!!!!!

  • @KaptainLuis
    @KaptainLuis8 ай бұрын

    Thank you!

  • @michaelkasembeli6074
    @michaelkasembeli607427 күн бұрын

    This was so helpful

  • @Pharaohmolo
    @Pharaohmolo2 ай бұрын

    Incredible.

  • @samuelsimukoko3397
    @samuelsimukoko339711 ай бұрын

    This is wonderful!!

  • @jakobv8
    @jakobv8 Жыл бұрын

    Very interesting. I recently saw a 101 video of how MRI works and it's been lingering in my mind. This gave me a reminder and further depth. It is tricky stuff, really needs to explained several times to a layman.

  • @ew7512

    @ew7512

    9 ай бұрын

    Yes! I'm a layperson too, but really want to get a grasp on this technology because it's so fascinating and revolutionary. Watching a variety of videos explaining it is helping me to get a good understanding.

  • @brendawilliams8062

    @brendawilliams8062

    6 ай бұрын

    Me too, is there attractors involved. Deep stuff

  • @Elyrion4409
    @Elyrion44092 ай бұрын

    that was amazing!

  • @bat7797
    @bat7797 Жыл бұрын

    Thank you so much

  • @cloudsky997
    @cloudsky997 Жыл бұрын

    Cutest explanation ever seen😆

  • @annastark9917
    @annastark99172 ай бұрын

    Very nicely explained

  • @ianlewis4383
    @ianlewis43837 ай бұрын

    I’ve met dr Gomez before and can attest that she’s a great person in general ❤ happy to hear her voice on a KZread vid

  • @youngdegenerate1002
    @youngdegenerate1002 Жыл бұрын

    Thank you video

  • @selgomezbabe135
    @selgomezbabe135 Жыл бұрын

    This is super helpful!! is there another video for T2 and T2* weighting?

  • @yannickhs7100

    @yannickhs7100

    Жыл бұрын

    Was about to say that 🙏 would even pay for that !

  • @patharnr8569
    @patharnr85695 ай бұрын

    This vdo is valuable!

  • @hasanghavidel2701
    @hasanghavidel270111 ай бұрын

    how these protons are cute 😍, i could understand all concepts.. god bless u

  • @bladox971
    @bladox9714 ай бұрын

    Exam in just a few hours, if i pass, it'll be thanks to you

  • @shathiskumargovindaraju1223
    @shathiskumargovindaraju12232 ай бұрын

    great video. tq very much

  • @maximilianriemer2356
    @maximilianriemer2356 Жыл бұрын

    amazing Video

  • @ShiraRachlin
    @ShiraRachlin Жыл бұрын

    It says more on that later at the end- is there another video in this series?

  • @vanshthukral9440
    @vanshthukral9440Ай бұрын

    Radiologists generally dont dive that deep into the physics of imaging modalities, i am shocked to see this MD knowing everything, she must be a genius

  • @fahimandfardinsofficials1312
    @fahimandfardinsofficials13122 ай бұрын

    Nice ❤

  • @delfipotters3161
    @delfipotters3161 Жыл бұрын

    at 0:24 you say a hydrogen atom is just a proton, one positron and one electron. I'm very confused why you said that. There is no positron in a hydrogen atom

  • @HemaSalam

    @HemaSalam

    Жыл бұрын

    Me too

  • @MyNotSoHumbleOpinion

    @MyNotSoHumbleOpinion

    Жыл бұрын

    She probably meant "positive proton"...

  • @delfipotters3161

    @delfipotters3161

    Жыл бұрын

    @@MyNotSoHumbleOpinion Protons always have a positive charge. She hopefully meant proton, but saying positron is very wrong.

  • @MyNotSoHumbleOpinion

    @MyNotSoHumbleOpinion

    Жыл бұрын

    @@delfipotters3161 yes, I know about positive charges of protons! But considering that luckily we live without positrons, "positive proton" seems to me the homophonic word that could match the erroneous "posi-tron"!

  • @acluster3411

    @acluster3411

    Жыл бұрын

    I guess that was jus slip of the tongue, she meant proton. She seems to know her stuff very well!

  • @HemaSalam
    @HemaSalam Жыл бұрын

    How did a positron made it here 0:25 ? Can someone explain?

  • @Blak2blue
    @Blak2blue8 ай бұрын

    I clicked cuz the molecules where so happy! 🥰🥰

  • @martinprochazka5280
    @martinprochazka52803 ай бұрын

    Damn what a vocab this woman has

  • @dhathriprasad7121
    @dhathriprasad7121 Жыл бұрын

    Wow

  • @princetamrac1180
    @princetamrac11803 ай бұрын

    4:33 in what dimension is the spiraling along the z-axis happening? One axis is the tranverse magnetization, on the other longitudinal. What is the 3. axis to create a 3d spiraling effect? Also does the transverse magnetization flip from the "negative side" to the "positive side" back and forth in the spiral? How does that happen? Also, is the initial free induction decay with the 90° pulses not registered by the MRI and only the following 180° pulses? Thank you so much for the video. Cute little protons :D

  • @npact69
    @npact6927 күн бұрын

    So, can you use an MRI machine to affect the spin of an entangled particle? And if you could, you use that to potentially send Binary over a great distance faster than light?

  • @talesfreitas7873
    @talesfreitas787310 ай бұрын

    Magnificente, but.. Did you said that a proton components are onde pósitron and onde electron? It's not wrong?

  • @johnandrheyabordo644
    @johnandrheyabordo6449 күн бұрын

    Does that mean that not all protons flip when an RF is applied? Only a few become antiparallel, and those few then undergo free induction decay?

  • @TheLadyskittles
    @TheLadyskittles9 ай бұрын

    Where is the next one about T1 T2 phase?

  • @missmyth21
    @missmyth214 ай бұрын

  • @ileniapessotto7211
    @ileniapessotto72118 ай бұрын

    soooooc cute!!!!

  • @skybuck2000
    @skybuck20009 ай бұрын

    why do mri scan not scan the bottom nerves s2 to s5 ?!

  • @sierraoneal3501
    @sierraoneal35015 ай бұрын

    God bless you 🥲

  • @emald7739
    @emald7739 Жыл бұрын

    Two tissue types A and B have the same proton density and the same T1, but A's T2 is half as long as B's T2. Which of the tissues gives the highest signal on a spin echo image taken with TR=2500 ms and TE = 50 ms? And why?

  • @karineibrahim5628

    @karineibrahim5628

    Жыл бұрын

    B?

  • @sammytech9464
    @sammytech9464 Жыл бұрын

    🤩🤩

  • @akekalukardjnaphai464
    @akekalukardjnaphai464 Жыл бұрын

    May I ask why T1 have to be 63% of recovery ? Where this number come from ? Is it 50% recover of total energy ?

  • @ozboz1995

    @ozboz1995

    Жыл бұрын

    It comes from time constants (please google to learn more if you're interested).. 63% is used because its 1-(1/e) for an 'increasing' constant (where e = exponential function)

  • @radhaotwani3901
    @radhaotwani39019 ай бұрын

    can i get notes form

  • @braaitongs
    @braaitongs11 ай бұрын

    When atoms are hit with rf pulse, don't the parallel and anti-parallel fall over and align causing the 90 degree magnetic alignment? Anywho, this is extreme close to the method of nullifying gravity.

  • @alexpaul5a
    @alexpaul5a3 ай бұрын

    What is T1 though?

  • @kaungsithusett9017
    @kaungsithusett9017 Жыл бұрын

    not assuming anything about this particular presenter, but if it were an asian mom, the RF mom character would be holding a broom

  • @shashikantvairat8073
    @shashikantvairat80735 ай бұрын

    What's magnet

  • @aryankhanaryankhan6562
    @aryankhanaryankhan6562 Жыл бұрын

    How H pos have poles while having no electron

  • @carolinateixeira6709
    @carolinateixeira67094 ай бұрын

    2h of this from my teacher and I didn't understand half of what you explained in 10 minutes

  • @anjalipal5077
    @anjalipal5077 Жыл бұрын

    Mam kay aap is video ki topics ko aur ache se explain kar doge?

  • @Livecologne
    @Livecologne3 ай бұрын

    It is a good Video, but i understand it not really because it is in englisch, in german it was easylier for me.

  • @ammaralharbi7711
    @ammaralharbi77114 ай бұрын

    I WANT MOOORRRE INFORMATION NOOOO

  • @EmilMichor
    @EmilMichor25 күн бұрын

    A Hydrogen Atom is a Proton and a Electron, a Positron is the opposite of an Electron, it is Antimatter and anhilate with the Electron if it could.... So I'm 30 seconds into the video and already fundamentals are wrong....

  • @anastasia.2007.
    @anastasia.2007.10 ай бұрын

    Education from Johns Hopkins? Really??? 0:23 A hydrogen atom is a proton and an electron. A proton is NOT a positron and an electron. A proton is made of quarks. A positron is an anti-electron and is not a part of a proton or a hydrogen atom. Continue to spread your misinformation and pretend you are "educating" people!

  • @rutamatukaite3295
    @rutamatukaite32953 ай бұрын

    So much mistakes. Dont recommend. H plus has no dipole side.

  • @theafroveggie
    @theafroveggie9 сағат бұрын

    Thank you!

  • @HemaSalam
    @HemaSalam Жыл бұрын

    How did a positron made it here 0:25 ? Can someone explain?

  • @acluster3411

    @acluster3411

    Жыл бұрын

    I think she ment proton.

  • @Adadhable

    @Adadhable

    11 ай бұрын

    Yes, I wondering the same thing. What she said in the video is incorrect, and I think what she meant is "a hydrogen atom is a proton and an electron"

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