Paul Callaghan gives an introduction to NMR and MRI. This is the 3rd video of the series, the way that the Terranova-MRI system works is discussed. 10 episode series produced by Magritek Ltd.
As an EE who understands Precession, Resonance and NMR basics, This one finally gets to the areas I have been having trouble learning, namely how the three dimensions are resolved. On to #4.
Why is the prepolarizing field generated in the same direction as the oscillating transverse field? Shouldn't they be orthogonal to each other? Or does the prepolarizing field just ensure a large amount of similarly oriented protons, which all then shift to orient with the earth's field, which is fairly orthogonal to the oscillating transverse field? If that's the case, then once you get a bunch of protons oriented in the same direction, they tend to stay oriented with each other.
Really excellent presentation. Sadly, the presenter died in 2012 (look him up on Wikipedia - he was one of the most famous NZ scientists ever). No disrespect to him, but I must admit that I find it distracting that he often clearly says "magetization" instead of "magnetization" :)
