T1, T2 and Proton Density Weighting | MRI Weighting and Contrast | MRI Physics Course #6
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- เผยแพร่เมื่อ 27 มิ.ย. 2024
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Contrast in MRI images comes from differences in T1 and T2 relaxation rates in tissues. We can select TR and TE values that will preferentially highlight either T1 or T2 differences. In this talk we review T1 and T2 relaxation as well as Echo time and Repetition time. We finish off by looking at how we can select TR and TE times that allow for contrast in the image to be predominantly from the density of free protons within the tissues.
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small error @2:15-2:16 longitudinal recovery (63% not 67%)
Thank you! Small but important 🙂 will 📌 pin this so others can see 🙏🏻
I am starting MRI school in 2 weeks with zero background in this field. I purchased "MRI In Practice 5th Edition", and decided to read 3 chapters to familiarize myself with content prior to beginning class. Big mistake. I was so confused. I am a great student, but my brain is not geared to physics. Your videos are the BEST! You have a gift for teaching, and breaking it down into understandable terms. I get it now. I can speak for all MRI students when I say physics is one of the hardest parts. Thank you for caring because you did not have to conduct these videos. Best of luck to everyone going through the program and taking their licensing exam. May we be the best MRI Techs for our patients.
Best explanation of MR physics.
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Fabulous, it shows your strong hold on the subject.
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It's an absolute pleasure. I'm working hard on the next videos in the series. Hope you find them useful!
thank you very much sir.. very helpful as we prepare for our exam.. watching from the philippines..
Glad it was helpful! Best of luck for your exam. Regards from South Africa
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Great to hear! Next video is on diffusion weighted imaging 🥳
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HI doctor, great lectures as usual. I have a question. Referring to the statement around 5:34 minutes are these the same as what the books are saying about leaders and laggers. Are the muscle leaders and are the CSF laggers in T2 relaxation?
Making mri more simpler
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Thank you ❤️ glad they’re helpful!
The only channel for which I have turned on notifications. Sir next lecture please. Thank you.
New one is out 👍🏼 thanks for your patience 🙂
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We are waiting for the rest of MRI and CT Michael and thank you❤
Released a new one today ❤️
Chai... Well detailed.
Great lectures. 😊
Glad you like them!
Hi doc! Would me mind give guidance on oral cavity anatomy? I find the surrounding muscles names are so foreign n difficult to identify. 😮
Thank you for great lectures! I think I´m missing a small piece of the puzzle to understand this. Assuming we are starting from time 0 and applying the first 90 degree RF pulse, if we measure/sample the signal with short TE (for T1 weighting) i cannot understand how TR can have any impact on this measurement since it seams in the diagram TR is occurring after TE. The model does not make sense to me if there is only one repetition of RF-TE-TR with sampling at TE. In my mind for this to work the sequence of events would have to be something like RF-TE-TR-TE2 with sampling at TE2 for T1 weighting at least. In others words the T1 relaxation and subsequent 90 degree pulse (TR) must cycle at least once for the tissues to first differentiate (due to the different relaxation rates) and then be flipped in order to be measurable in the transverse plane. Am I making any sense here? Excuse the confusion.
thank you so much sir
Such a pleasure!
Why are you pointing those sticks that way? I consider transverse magnetization in the horizontal plane and longitudinal magnetization in the "axial" plane, but you show it the other way.
Thanksssss ka❤
Pleasure ❤️
Thank you very much sir for every information given to us ...
I have question please
Do you will give us lectures in CT scan ; mammography and flouroscopy ?
Thank you again boss
My pleasure. The plan is to complete MRI then move on to CT, fluoroscopy, nuclear med, mammography etc
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Will this be helpful for my ARRT Test?
Soo, what happens with a short T2 (~500ms, =full T1 differences of tissues) and a long TE (~100ms, =full T2 differences) ? We get a super bright image? Do the tissue T1 and T2 signals cancel each other out?
This is great ! Thanks alot
I am a newly rotating doctor in radiology department and your vedios is very very helpful ..
Can you suggest to me good reference for studying ..l dosnt like farr and it doesn't contain all this topics and information ..😢
Thanks Mohamed. I use Bushberg - essential physics of medical imaging.
What a gem you are🥵🥵
Thanks Sohail 🙌🏼
sooooo good
Thanks Chris. Hope you’re well mate 🙂
Sir what happens if we give 180 degree RF pulse after initial 90 degree RF pulse will it change anything
Wheres the next vids😢
New one out 🙂
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Waiting for next video.... come back
I’m back 🙂
please upload the MRI Q
This Friday hopefully 🤞🏼 🤞🏼
1 question.
If PDW is based basically on the number of protons available, then why is CSF but bright in PDW Brain images?
Okay got it.
It is actually bright, but just not as BRIGHT as in T2 weighted with long TE
63% or 67% ?
Apologies, there is a small mistake with the one diagram. 63%
I’m sorry I have a question… didn’t you say that we can directly measure T2 (transverse decay) with our first 90 degree pulse? (Eventually correcting T2* with the 180 degree pulse). Then the second set of pulse is for measuring the T1. You said in this video that to weigh a T2 image we need a very long TR and then a medium TE. But actually that goes only if we want to use the second pulse to measure T2. We could simply measure T2 in the first pulse considering that TR in this case would be equal to the time we initially apply B0 to all the protons in the first place. That goes to say that to measure T1 we absolutely must use the second pulse, but do we really need the second pulse to measure T2?
Hi Diego. We only measure the signal after the 180 degree pulse (in spin echo sequences). This measurement is a reflection of the T2 decay. Where I think you might be getting confused is that we don't take separate measurements for T1 and T2. We take one measurement and depending on when we apply the RF pulse (TR interval) and when we measure (TE), the image will have either T1 or T2 weighting. There is no measuring of T1 and T2 separately because we can never measure T1 directly in the longitudinal plane. Hope this makes some sense..
Sir make videos conceptual as possible as rather than informative like others
Will try my best
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