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 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 ?
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.
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...
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.
absolutely amazing! i am a neurologist and do mri research. these videos have dramatically increased my understanding of mri
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.)
Excellent videos, I'm a Biochemistry Undergrad and I find them very useful.
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.
Wow very good explanation! Good visualization of the spin-echo!
Thank you for the great videos! They are very helpful :)
great video. thanks and RIP Paul.
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 ?
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.
Great job Sir❤
Great content
awesome!
very informative sir
Thanks !
Thanks for sharing...
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...
keep with the same camera angle, otherwise a very good learning tool
awesome!