Dude, you're amazing. My prof was trying to explain this and I couldn't understand what he was talking about. You've got such a clear explanation and you answered every question I could have thought of.
I'm having an exam on this subject tomorrow. Showing those pictures and you moving around with your hands gave me a much better idea of these concepts. Thanks so much. I hope I will pass (if not, I will return for the re-exam and watch all your video's.)
I thought you originally said that the signal that kicks the hydrogen momements off the rest state was at the precession frequency, but here you say it is about 1 ms. Does this mean that it is only 2 cycles of the 2+kHz signal? Why couldn't this simply be a DC field to hold the H-moments for a while at 90 degrees to the static (precession causing Earth) field, then let the moments decay back to the Earth field orientation? Regards, Steve N.
I have a question . At 1:10 you say that 'the 90 deegree palse happens right at the start ' . But the Free Induction Decay Signal is measured after the 90 degree palse ENDS , because after that time the transverse magnetazation becames smaller and smaller , and that's why the signal is decreasing . So did you mean to say that ' the 90 deegree palse ends right at the start ' or am I mistaken ?
So T2 is due to the nucleus of the molecules getting out of line again, and T2* is due to the non-homogenous magnetic field? I still don't understand...
![[UNCUT] ที่นี่ที่แรก ปู - หาญส์ พูดถึงมหากาพย์หนี้สิ้น I คนดังนั่งเคลียร์ I 10 ก.ค.67](http://i.ytimg.com/vi/KDNA9DZ0p4U/mqdefault.jpg)
Dude, you're amazing. My prof was trying to explain this and I couldn't understand what he was talking about. You've got such a clear explanation and you answered every question I could have thought of.
I'm having an exam on this subject tomorrow. Showing those pictures and you moving around with your hands gave me a much better idea of these concepts. Thanks so much. I hope I will pass (if not, I will return for the re-exam and watch all your video's.)
absolutely amazing! i am a neurologist and do mri research. these videos have dramatically increased my understanding of mri
Excellent videos, I'm a Biochemistry Undergrad and I find them very useful.
Thank you for the great videos! They are very helpful :)
Wow very good explanation! Good visualization of the spin-echo!
I am studying Radiography at the moment and want to get into MRI. These videos are gold!! Thanks Paul bro, your the best
Really enjoyed Video 6 and the explanation and importance of homogeneity. Thanks again.
great video. thanks and RIP Paul.
Great job Sir❤
awesome!
Great content
Thanks for sharing...
Thanks !
very informative sir
Why isn't the 180 degree pulse visible in the first FID-Echo display, but it is in the multi-pulse display?
I thought you originally said that the signal that kicks the hydrogen momements off the rest state was at the precession frequency, but here you say it is about 1 ms. Does this mean that it is only 2 cycles of the 2+kHz signal? Why couldn't this simply be a DC field to hold the H-moments for a while at 90 degrees to the static (precession causing Earth) field, then let the moments decay back to the Earth field orientation?
Regards, Steve N.
I have a question . At 1:10 you say that 'the 90 deegree palse happens right at the start ' . But the Free Induction Decay Signal is measured after the 90 degree palse ENDS , because after that time the transverse magnetazation becames smaller and smaller , and that's why the signal is decreasing . So did you mean to say that ' the 90 deegree palse ends right at the start ' or am I mistaken ?
keep with the same camera angle, otherwise a very good learning tool
So T2 is due to the nucleus of the molecules getting out of line again, and T2* is due to the non-homogenous magnetic field? I still don't understand...
awesome!