Introducing MRI: The Gradient Echo Pulse Sequence and Modified Flip Angle (34 of 56)

[@srikrishnandivakaran891]

Enormously invaluable set of video lectures. Even as a theoretical computer scientist these lectures are accesible, very crisp and are carefully planned to provide key insights coupled with excellent illustrations. I cannot thank Dr. Lipton enough and also a teacher his lectures are a benchmark for combining concepts with illustration of these concepts. This resource is helping me in my attempt to develop efficient algorithms for registering MRI scans of patients (i.e. like the keyhole technique many fast algorithms can be developed by restricting the field of view and augmenting this with past MRI scans).

[@trnr2000]

Every time I'm teaching MRI physics, I'm rewatching your lectures. Thank you for helping to make MRI more clear. Your lectures are still being watched :)

[@ak49gun123]

The best MRI lecture

[@eglen7664]

Dr. Lipton you are my hero

[@dangerousman4071]

could you make a video on spoiled and coherent GRE sequences. Just a little bit of detail on GRE subtypes would be the best.

[@chinmoy11091987]

Thank you for sharing this great lecture with all

[@rajaestiha2211]

thanks very very much , you are the best doctor !

[@mikeb2407]

Can someone explain how the amount of longitudinal recovery impacts the amount of transverse magnetization you can generate? I thought the magnet only measures transverse magnetization from phase coherence due to T2 processes?

[@shashwatpriyadarshi972]

Why do we need the dephasing pulse ,anyways protons were dephasing via T2*decay?what is that rephasing lobe during slice selection?

[@share21gaming95]

Just want to know whether the last series of images are proton density weighted images?

[@ashleygesty7671]

thanks very much sir this was very helpful!

[@timurnavruzov7145]

Thank you very much

[@shashwatpriyadarshi972]

When you apply the RF pulse when the hydrogen nucleus has not regained its longitudinal magnetization fully then don't you cause partial saturation of hydrogen nucleus that is doesn't it go beyond 90?

[@siyadka7483]

This results in signal drop.

[@TheDschn001]

Thanks you!

[@jay_carraway]

Smart professor, not so smart/quick students. Some of their questions really made me wonder if they were listening at all... Dr. Lipton really explains it coherently and clear. Thank you for that!

[@shashwatpriyadarshi972]

Bro, probably you are very intelligent because even I had to pause multiple times hear it over again to get hold of this complex topic.By the way I am a radiologist in India ,what about you?

[@TC-dw6wg]

He probably works in the field as a licensed MRI tech and this is basic knowledge to any decent MRI tech. Low self esteem statement made by Jay as he needs to build himself up by putting others down. Sad

[@jay_carraway]

@@TC-dw6wg Nope, that was five years ago while doing my physics degree at university :D Am now working in software development. Sorry, that was really the way I felt watching the video.

[@Aj_For6]

@13:31 - when transverse signal is less, does the parameters of RF pulse lessen to get same degree of 45 angle?

[@TC-dw6wg]

Yes. You either shorten the duration or strength of the signal to achieve the lower flip angle. Ex. 45 deg.

[@shashwatpriyadarshi972]

Does loss of transverse magnetization and regrowth of longitudinal magnetization of a hydrogen nucleus occur simultaneously?

[@TC-dw6wg]

Yes

[@rudhajassim9469]

thank you great explanation

[@anwar87999]

Great lectures, thanks aren't enough

[@fardinrahman1145]

a jew

[@fardinrahman1145]

ewwww