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- เผยแพร่เมื่อ 13 ต.ค. 2011
- Dr D. Bulte from Oxford University's FMRIB (Functional Magnetic Resonance Imaging of the Brain) centre explains the theory underlying today's modern MRI scanners and outlines the work of the FMRIB centre.
If you are interested in the field of Biomedical Sciences, including Magnetic Resonance Imaging, please click on the link below to visit Oxford University's Biomedical Sciences undergraduate course.
www.medsci.ox.ac.uk/study/bms
This video was produced by Oxford Medical Illustration -- a non-profit making NHS department. For more information please click on the link below:
www.oxfordmi.nhs.uk - วิทยาศาสตร์และเทคโนโลยี
I absolutely love it when people who are knowledgeable about a subject explain the subject.
Man I would love to have such clarity in formulating my own thoughts. Impressive, informative, amazing
Best video about MRI there is...believe me, I searched all over
agreed, this one is the best one
I love how it's just technical enough so that you understand the fundamentals of what's going on, but he also does a great job of explaining how things work in a simple and easy to digest manner. Definitely have a better grasp as to what goes on now.
Thx
He explained so simply I now understand it. Thank you so very much Dr Daniel Bulte.
Hi Dr. Bulte ~ thank you for the clear and concise video explaining how MRI works, this really helped me study for radiology final exam in medical school! All the best from Seattle.
I visited the Siemens Healthcare factory in Erlangen, Germany as part of our Bachelor's Studies. The amount of cutting-edge engineering and technology that they have in order to manufacture these MRI machines is astonishing. Simply one of the "craziest" technology companies out there.
I've explained the functioning of an MRI in a basic form since they were first about in 1980, but this really blows that explanation out of the water and expands it way beyond - brilliant!
I hope nobody will repeat this demo near the MRI machine.Great video.
Superb explanation, thanks. And I love the fact Dr B chooses 'doing calculus' as an example of what he might get a person to do during an fMRI session, not just 'maths' or 'sums'!
I really appreciate how to the point this is. Some people just drag things out and repeat themselves over and over which gets super annoying. Thank you!
Congratulations Dr. D Bulte. Your explanation of MRI is the best I've ever read to date. This sharing of important information is most appreciated. Thank you!
Really a clear explanation about the MRI system. The only vedio on youtube which can clear the concept. Thank you sir for your great vedio
Been searching all over the place on how a scanner works. I finally landed here. Now I got it. Great explanation.
One of the best descriptions I've heard. Thanks you.
Smart man, thanks for making this, gave me some peace of mind.
It's been 10 years since this video was posted..Still, it's my favorite
GREAT explanation!
That was real good explanation! Loved it
Wow, really clear explanation, thank you.
Wonderful video. Thank you Dr. Bulte.
Awesome explanation...
By far the best video I've seen about MRI, trust me i'm twelve and this is the video that helped me understand this concept
Wonderful explanation! I feel like I finally understand MRI now!
Great explanation, gonna have to see it a couple more times though.
Simplest way one can explain T1 and T2 relaxation. Shukriya (Thanks) Dr Bulte
Thank you so much.... very useful... short but full of information!
really clear explanation! thanks
Perfectly explained! Thank you very much
Very helpful. Thank you Dr. Bulte.
Thank you. Now I understand a bit more about MRI.
Thank you so much! Brilliant explanation!
Extremely good video, thank you.
Aussie? I loved to know how it works, i asked thr operator and she was like ahhh i dont really know. hahaha
skilled. Thanks for this mate!
Excellent video!
Thanks for the video. Super cool!
Thank you for this video!
great explanation!!! thank you million!
very well explained!
amazing explanation!
Thanks! that was very helpful.
Nice Video! quite informative for my A level Physics and chemistry as well
Great content!
Thanks! That was quite helpful
Best explanation ever. Thank you
its 8 years since this was published but thankyou i really needed this for my physics asg lmaoo
You my friend...are a smart cookie. Thanks
Very informative, thank you.
Bravo, majstore!
Came to understand what kind of scan I just had in a MRI mashine. Now I'm totally clueless.
Amazing explanation
Good explanation!
SO helpful thank you sm
This guy is good. Thanks for this video, helped a lot .
Great explanation, I agree.
Very informative thank you.
That is quite fascinating how two interacting (but opposing axis fields) can create a proton spin and thermal spike at that scale.
That was great. Thanks a lot.
Very good explanation of a very complicated subject, although I wish you would have mentioned more about how gadolinium affects the contrast.
Excellent thank you
Physicist here and this explanation is amazing
nicely explained
so articulate bro. wish u were my lecturer
Very useful explanation
Best explanation on mri
Good job 👍
Very Helpful! Thank you ^_^
Brilliant explanation, could do with a little more on hydrogen non zero spin etc, but still the best video I can find
Very informative video
very helpful thank you.
nice explained
excellent! thank you
You're a life saver
thanks so much I finally understand.
I salute you Sir !!
Signal in MR images is high or low (bright or dark), depending on the pulse sequence used, and the type of tissue in the image region of interest. The following is a general guide to how tissue appears on T1- or T2- weighted images.
Dark on T1-weighted image:
increased water, as in edema, tumor, infarction, inflammation, infection, hemorrhage (hyperacute or chronic)
low proton density, calcification
flow void
.
Bright on T1-weighted image:
fat
subacute hemorrhage
melanin
protein-rich fluid
slowly flowing blood
paramagnetic substances: gadolinium, manganese, copper
calcification (rarely)
laminar necrosis of cerebral infarction
.
Bright on T2-weighted image:
increased water, as in edema, tumor, infarction, inflammation, infection, subdural collection
methemoglobin (extracellular) in subacute hemorrhage..
..
Dark on T2-weighted image:
low proton density, calcification, fibrous tissue
paramagnetic substances: deoxyhemoglobin, methemoglobin (intracellular), iron, ferritin, hemosiderin, melanin
protein-rich fluid
flow void
Great!! Thank you
Fascinating
Very Good. I am Looking for some explanation for T1 and T2 imaging. and how does it happen?
Amazing
Hello, I am studying EM-5 Comprehensive Electronics subjects on ac/dc motors. My question is what type of power supply does an MRI machine use? Single-phase or Three-phase? Just curious?
Thank you...
Thanks!
I'm here because had 7 within a year due to a Brainstem Cavernoma found on Nov 2017 after having a stroke since it's in my pons doctors do not want to remove it they all say it's too risky I'm 36 yrs old never had any health problems just bad headaches thanks to an MRI doctors were able to diagnose me. For now all I can do it's wait and see since brain surgery it's not an option for me. Over all good video🤗 I kinda of got it
Hope everything went well...
amazing stuff, i wonder what they were experimenting to discover this
Nuclear Magnetic Resonance - apparently that word was scary, so they chose the term MRI instead.
Its origin lies in a technique chemists use to help determine the structure of organic molecules called Nuclear Magnetic Resonance Spectroscopy. It uses a superconducting magnet (back in the early days of the technique, just strong ordinary magnets) and radio frequency light. The physics of NMR and MRI is exactly the same, the spin flip of a proton when immersed in a magnetic field. The two techniques just look at different aspects of it. NMR is more concerned about the absorption of radio frequency by nuclei in the magnetic field whereas MRI I believe is more concerned with the amount of time the nuclei spend in their excited states.
@@malayali_m NMR is still the term we used in the chemistry field. Same basic concept though.
@@8543960 , why such strong magnetic field (about 3 Tesla) is necessary?
Why was the N removed from the acronym MRI?
its v v v good
So articulate
mind blown, im here cos i had an MRI scan of my wrist today.. damn
Do you have a phd? You are incredible.
Thanks ;)
Bravo
Most expedient explanation on MRI..👌...all others will only ever say..3 magnets, an electromagnet, supplying current,...and boom you got the image...like wtf 😒
Why my Dr. ordered me a CT-Scan. I want an MRI. i dont want to be expose to ionizing radiation please
So when you have a magnetic field on and your water particles are processing towards the initial B-field...you then turn on an orthogonal B-field to get the water particles to process towards that one (at a orbital of energy). But dont you have to turn off the orthogonal B-field once the water particles start processing with the orthogonal B-field so that they quickly jump back down a state because they will start processing towards the initial B-field. So once the the orthogonal B-field is turned off and the water particle is processed back to the initial B-field , doesnt the water particle emit a photon (which is light) and then they have a sensor waiting to catch all those photons to get a good image of bones,tissues,etc? emits a photon because of the jumping down from a higher orbital to a lower orbital? or am i thinking of it completely wrong?
You are basically correct. Individual protons absorb and emit photons, but the net magnetic moment (the sum of many, many protons) rotates down in a spiral motion while the B1 field is on, then spirals back up to the B0 direction once the B1 is removed.
I'm not sure if the spin actually process in the transverse plane when RF pulse is applied, as explained from 2:30min. As far as I know, hydrogen can only have two energy states, high or low, and it is the NMV (Net Magnetic Vector) that lies in the transverse plane which gets detected by the reciever coil, NOT the magnetic moment nor the spin themselves.
This is exactly correct! The video is the physics tradition of "simplified to the point of being wrong", and we will reteach it all differently next year.
Are you sure? I think the video is saying correct
Thanks for the explanation. I'd like to point out that particles are not spinning. Spin is a fundamental quantum property of the proton and has nothing to do with it spinning.
That's pretty nuts.
this guy is smart
I think this would have been better if he’s explaining the concept while lying down on the MRI and on side screen, we can simultaneously see his brain scan (real time)....
QSM?