Thank you so much for this lecture along with all of your other physics lectures. I've yet to find anyone else that explains concepts as clearly as you do and keeps the material interesting. Donating now. Thanks again, Andrey!
This is so amazing! Thank you so much for making this video. It really meant the world to me. I've been trying to understand this so many times, but your video really helped me!
:O this videos answered so many little questions i had about MRI. You really helped me visualise the proton. Like most videos don't go into as much detail.
Fantastic video. So clearly explained. I really appreciate the time you have taken to make sure everything is explained properly. I wish all RU-vidrs were so careful about the quality of their videos!
You are just Amazing! i just cannot express how grateful i m to u for uploading this video! really really helpful! God bless..Keep up the Good work! 👍👍👍
4:41 - Are the two precession axes in the normal state perpendicular, whereas the two precession axes in the excited state are parallel? I'm confused. Thank you very much for this video, it is great! Keep up the good work!
Can someone explain to me how come the spin up proton will lose energy while the spin down gain energy when experienced a magnetic field? thanks in advance guys
Man I was doing so well until the symmetry fell apart for the spin down Vs spin up proton :-( Are you saying the B from the external field increases the moment of the proton in the spin down orientation because of the relative direction of the flux with respect to the direction of rotation? All the same this is great, other videos don't go deep enough...
As I understand it, T1, T2 and T2* relate to the relaxation times of protons as individuals and phase-related group effects. Their timings are different, which is why you get distinct signals with those labels.
So the EM pulse both changes the spin from up to down AND flattens the precession? If the precession is flattened to as far as it goes, it shoud end up spining around it's equator. I am confused :-[
I have an MRI CD and would like to know how I can get someone with knowledge and experience to look at it and see what can be seen in terms of left kidney, large bowel, aorta artery and abdominal tissue. I have no Idea what is normal and abnormal in the images. Can you please help me ? I am 26 and in constant abdominal and lumbar pain on left side for years. Thank you, Luis
..or you could simply state, by electromagnetically pulsing the atoms in your tissue I can from listening to their resonance determine their density. And my cine viewer will show me the difference…..
lol photons that are released!!!! omg dude, you are so wrong!!! If you must know, energy is given off as flux, which in turn is read as the receiving signal. When there is photo-emission there are certain k-space parameters that must be conserved. However, this doesn't happen here. It would be better if you said you didn't know. Now people will have the wrong idea. Also you say, that the magnetic field has to be two Tesla for there to be a spin up to spin down arrangement THIS IS WRONG, it is the radio-frequency that gives the energy for this to happen (resonance? ring a bell). This is full of nonesensical information. PLEASE GO ELSEWHERE TO KNOW WHAT REALLY HAPPENS!
AK is wrong about some aspects and incomplete about others, but he got much more right than he got wrong. But you didn't get it completely right, either: photons are the exchange particle that mediate the electromagnetic field. Flux is the density of that field, is not radiated because, by definition, it is the field strength in a given volume. If you know what k-space is, then you probably do have something useful to contribute (eg how it is a frequency-domain representation of a temporal-spacial domain image and how you get from the former to the latter).
