Gradient Echo MRI | MRI Physics Course #16
HTML-код
- Опубликовано: 29 сен 2024
- High yield radiology physics past paper questions with video answers
Perfect for testing yourself prior to your radiology physics exam 👇
➡️ X-RAY, ULTRASOUND AND MRI BUNDLE (SAVE over 25%): www.radiologyt...
➡️ X-RAY QUESTION BANK: www.radiologyt...
➡️ ULTRASOUND QUESTION BANK: www.radiologyt...
➡️ MRI QUESTION BANK: www.radiologyt...
=========================
I have also created two RADIOPAEDIA LEARNING PATHWAYS
bit.ly/radiopa... (👈 25% OFF DISCOUNT LINK)
WHAT’S INCLUDED?
✅This RUclips series Ad free
✅Constantly updated Radiopaedia articles
✅Summary slides
✅Key take home bullet points throughout
✅Multiple review quizzes
✅Short answer review questions
✅Official Radiopaedia course completion certificate
25% discount using this link: bit.ly/radiopa...
=========================
I have decided to separate gradient echo into three sections. How the gradient echo is created and why we need a gradient echo, the flip angle and gradient echo pulse sequences.
So let's start be reviewing the gradient echo.
=========================
SIGN UP TO MY MONTHLY EMAIL NEWSLETTER 👉 bit.ly/3ruLh3d
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 creating these videos, as an MRI Radiographer in the UK, these make sense to me. I can understand them. I've had lectures from physicists who think we're physicists that just do not make sense. Your explanations are absolutely spot on and clear!
Please guide us at CT also🙏
Thank you Michael for your amazing explanation! You are the best ♥
Thanks for you support 🤗
In gradient-echo pulse sequences, an RF pulse cannot rephase transverse
magnetization to create an echo. The low flip angles used in gradient-echo pulse sequences
result in a large component of magnetization remaining in the longitudinal plane after the RF
excitation pulse is switched off. The 180° RF pulse would therefore largely invert this magnetization into the−z direction (the direction that is opposite to B0) rather than rephase the transverse
magnetization [1]. Therefore in gradient-echo pulse sequences, a gradient is used to rephase
transverse magnetization instead.
Can anyone give clarification which is correct gre opposing 90 or 180?
You’re saving so many of us and so many more to come Michael !
We’ve had our ECVDI welcome to new residents meeting last week (veterinary radiology college), and you should know your tutorials were presented as one of the best support to study physics ! And i couldn’t agree more with that recommendation 🫶
Thank you for explaining so clearly
for straight to gradient echo 05:00.
Thanks a lot sir Michael 🎉❤
Thankyou sir 🎉
Thank you for the great tutorial, sir! What confuses me is --- Is the less than 90 deg spin flip caused by the RF pulse or the gradient field from the gradient coil? Appreciate the response.
Very well explained
Thankyou ❤❤
Amazing. Thanks ❤
I like your videos before even watching them, cuz i already know its gonna be an amazing lecture. Thank you Michael for your work, it really helps a lot.
An aspiring radiologist from Hungary.
Hello from South Africa 👋 Thank you for all your support! So glad the videos are helpful
very nice explanation but sometimes the analogies you give are not very applicable to the concept. you can come up with the more logical ones...for example for 180 degree pulse,you said that we can compare it with changing the direction of the faster spin so that it can catch up with the slower spin...i would suggest another analogy that would,hopefully, explain it more clearly....taking the same example of a race that you rightly gave,what the 180 degree pulse does, is in essence, forcing the faster spin to go 'behind" the slower spin and then catch up with it finally.With this intrusion,the 180 degree pulse compensates the differences in the speeds of the two contestants..very unfair though 😂....Being your student i think my mind has also started working very well now 😀😀💪...Many thanks to you 🤩
Thanks for the feedback 🙂
can you do video's where you do calculations on MRI. like signal intensity. and ellaborate the formulla.
like scantime calculations. how big the voxels are. and other factors
Thankyou micheal
Very clear explanation, Thank-you sir 🎉
Thank you! So glad you enjoyed it 👍
Thankyou sir
Thankyou sir
Thankyou sir
Here we go!
🫶🏻🫶🏻
🫰🤝
😍😍
🙏🙏
🙌🙌
❤❤
👍👍
Mri completed?
Few more to come still. Inversion recovery sequences, spectroscopy, angiography, DWI and artifacts.. Getting there slowly and steadily though 😅
شكرا لك
My pleasure 🙂
Thank you doctor 😊
Pleasure Guduri 🙂
@@radiologytutorials I have read one book stating that Gradiant PES oppose 90 pulse ,BUT USE 180 to flip fully into -Z direction, in gre using less than 90 & probably 30 degree to 45.
In gradient-echo pulse sequences, an RF pulse cannot rephase transverse
magnetization to create an echo. The low flip angles used in gradient-echo pulse sequences
result in a large component of magnetization remaining in the longitudinal plane after the RF
excitation pulse is switched off. The 180° RF pulse would therefore largely invert this magnetization into the−z direction (the direction that is opposite to B0) rather than rephase the transverse
magnetization [1]. Therefore in gradient-echo pulse sequences, a gradient is used to rephase
transverse magnetization instead
@@radiologytutorials Doctor please give me a reply & I am in little dilemma which is correct.
The explanation is very good but in my opinion you are repeating the same information too many times across lectures, the amount of new information in each lecture is relatively small compared to how much repeated information there is. For sure it makes each lecture a seperate entity but trying to watch all of them one by one is hard due to 80% of time being a reiteration of the same info
In my opinion you are ungrateful for free tutoring.. he repeats the last lectures for a clear understanding of the material. A good idea would be for you to skip the material that you don’t need or get your own channel and teach it yourself. He has helped my entire class with his lectures
Disagree. Maybe if you are binging I can understand. But if you don’t then the repetition is a good review of the information that each lecture builds on.
There is a reason for those repetitions. It brings you to understand clearly before he moves on to the next talk. These kinds of comments don't help the person teaching, because these are very thick lectures which aren't even clearly taught in schools and if someone has dedicated a lot of time and commitment to do so freely, we should rather be grateful.