Introducing MRI: Introduction to Magnetic Susceptibility (14 of 56)

www.einstein.yu.edu - The fourteenth chapter of Dr. Michael Lipton's MRI course covers Introduction to Magnetic Susceptibility T2' and T2*. Dr. Lipton is associate professor radiology at Albert Einstein College of Medicine and associate director of its Gruss Magnetic Resonance Research Center.

[@kuba58426]

I'm a bit confused - back at the beginning dr Lipton said the NMV is antiparallel to B0 and defended that position in a comment under part 5 despite some books stating otherwise. But here he's drawn the NMV parallel to B0. Was it done on purpose or is it just a mistake?

[@rahulsingh-sm8om]

I agree even I read NVM as parallel to B0 and here the Professor said in last few lectures that 6 out of 10000 protons are anti parallel to B0.

[@Pendergeist]

I think it is a mistake as he has clearly said in the past that the ONLY time NMV is parallel to B0 is in a perfectly homogenous field with nothing else inside it. When you have a patient or some other diamagnetic matter in the field then the lower energy state actually is the ANTI-parallel direction and that's why in a real life clinical situation, the resting state of the NMV is anti-parallel. At least that's my understanding of the content so far

[@mcyte314]

In T2 relaxatiom, how can spins dephase, if they have the same Lamour frequency? In T2 prime they dephase because their frequency is different, as Iunderstand.

[@maxla9691]

The T2 is due to spin-spin interaction which leads to the same effect: spins will have different precession frequencies. In T2* you have both, the magnetic field inhomogeneity + the spin to spin interaction which both cause variations in precession frequency (which then cause the spins dephasing)

[@h.q.1736]

In gradient echo image why don’t we use even a shorter TE to get a better contrast
And thank you very much for the great lectures

[@SssSss-bh3cv]

Helen Q. Watch the contrast video he explained this point very clearly

[@h.q.1736]

sweet tota thank you very much

[@manviagarwal9660]

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