Coherent, Incoherent "Spoiled" and SSFP Gradient Echo | Stimulated Echo | MRI Physics Course #18
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- Опубліковано 1 жов 2024
- High yield radiology physics past paper questions with video answers
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We've seen how T2 weighting can still be achieved with short TRs by using a small flip angle. However, in most gradient echo sequences TR is so short that we can't have a long enough TE to allow for T2 contrast to develop.
In this talk we look at the basic physics behind the stimulated echo and how that can be used to create T2 weighting. We then show how the stimulated echo, free induction decay curve or a combination of the two can be used to manipulate contrast in an image.
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Not sure if the question banks are for you?
If you're here, you're likely studying for a radiology physics exam. I've spent the last few months collating past papers from multiple different countries selecting the most commonly asked questions. You'll be surprised how often questions repeat themselves!
The types of questions asked in FRCR, RANZCR AIT, ARRT, FC Rad Diag (SA), ABR qualifying Core Physics and MICR part 1 are surprisingly similar and the key concepts remain the same throughout. I've taken the most high-yield questions and answered them in video format so that I can take you through why certain answers are correct and others are not.
Happy studying,
Michael
#radiology #radres #FOAMrad #FOAMed
Thank you so much for these videos! I have a hard time learning out of textbooks and these are the best videos on UA-cam of MRI physics. A week ago I was lost and now I have confidence in passing this exam at some point 😁 🙏
Thank you. I have no doubt you will pass the exam! I also struggle with textbooks 😣 That's the main reason I've chosen to make these. Be sure to message me to let me know when you pass!
Said it before and im gonna say it again, thanks for the amazing course so far. MRI physics is made easy thanks to you.
Thank you 🥰
I think that using SSFP as a general term for GRE with echo refocusing can be misleading because only GE refers to them that way. Additionally, other coherent sequences, such as FISP or TrueFISP, are also SSFP sequences because steady-state free precession is present.
I really appreciate that you take the time to reinforce previous concepts in each video to further comprehension and retention. Thank you for all your hard work and dedication to helping your viewers.
I have a very specific request to you ...dunno if everyone would agree or not ...seems like a board and a marker is really in need to make your explanations, truly conceptual.....take love ❤
Thank you for the feedback!
@2:04 "Doing this, putting two RF pulses close together will generate what's known as a stimulated echo"
This doesn't sound right. Stimulated echoes originate from 3 RF pulses. A good mechanism overview is given in "Stimulated Echoes: Description, Applications, Practical Hints" from Burstein 1995.
Crt brother
Amazing lecture on one of the complex topic.
We want for CT
Busy finishing the MRI series at the moment, but hoping to move on to CT in the fairly near future!
Thanks for your courses. I believe I’ll be fully prepared to take my ABR exam this fall. I wish there were courses on CT physics and nuclear medicine-those would have been amazing. Your question bank is fantastic too; it really challenges me to understand and remember complex concepts.
This is so helpful!! I was really struggling to understand the stimulated echo from textbook diagrams so this is amazing. Keep up the great work!
I'm so glad! That's exactly why I started this channel - sometimes the textbooks make things seem more complicated than they actually are 😆
In my opinion GRE sequences with refocusing of the stimulated Echo (PSIF, SSFP) are also coherent. They are just part of the coherent GRE sequences, just as the balanced GRE sequences with combined "FID" and "Stimulated Echo" refocusing (TrueFISP, etc.).
😍😍😍 i hope you publish CT cours videos 🥹🥹🥹🥹🥹
Hoping to finish the MRI series soon, so 🤞 CT will follow
We are so grateful to have a teacher like you. The way you explain these topics is incredible.😇
Thank you so much doctor, your videos help me a lot, it's just amazing.
Thank you
Great. Thank you very much ❤😊
Please make video on perfusion as well
Thanks a lot sir Michael 🎉, this series was incredible 👏 😊
Thankyou micheal❤❤
Thankyou micheal
Thankyou sir🎉🎉
Thankyou sir🎉🎉
Thankyou sir🎉🎉
Thankyou sir🎉🎉
Thankyou sir
Thankyou sir
Thankyou sir
Thankyou sir
Thank you sir
When is mri question bank coming?? Please release soon
Hi @kess562 - working super hard to get it out ASAP 🤞
Thankyou 🎉🎉
Thanks sir
Thankyou 🎉
Thanks man
Great content like always. 😊 Thank you very much!
So kind! Thank you 💓
Thankyou ❤❤
Thanks man🎉🎉
Sir when ur going to start CT physics
Still working on completing the MRI course, but hoping to cover CT at some point this year 🙌
Thank you ❤❤
Thanks man❤❤
you are the goat bro
Haha, thanks mate 🐐
I love your work! Thank you!
Thank you for your support 🙌
great lectures
Thanks for your support @caiyu538 👊
the problem is you take 30 minites to say something that should take 30 seconds, and you spend so much time unnecessarily restating things that you've already said, that you don't even clearly emphasize the 30 seconds worth of actual valuable content in the video.
Sorry you feel that way. Not everyone learns the same I guess. You might just get concepts quicker than others. Any specific examples so I can try improve?
@@radiologytutorialsi feel the same but ik what youre getting at by intuition. Everyone might not be able to do that. Explaining step by step is the better way. Thanks for these videos.
i think sometimes less is more, and just having a disclaimer at the beginning (as you already do) is better than re-stating the frame of reference (at least for me). but i appreciate your work, and i think you've done more than anyone else on youtube or elsewhere online to explain the details of this stuff
@Jacob-ye7gu thanks 🙏🏻 Appreciate the feedback! Very valuable for me to get everyone’s opinions.
It’s funny because I debated refilming this video (due to the long intro sequence). Then had three private tutoring sessions where people really struggled to grasp the difference between spin and gradient echoes. Ultimately decided to keep it in, in order not to leave anyone behind. It’s tough trying to teach a large diverse audience..
@@radiologytutorials For someone like me who struggles with physics in general, I really appreciate the repetition and summarising what we know so far. The great thing about an online platform is being able to replay and forward sections as necessary. Really appreciate all your hard work- Thank you!