MRI Field of View (FOV), Matrix Size, Receiver Bandwidth, Dwell Time | MRI Physics Course #11
Вставка
- Опубліковано 17 лип 2023
- 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.radiologytuts.com/bundles...
➡️ X-RAY QUESTION BANK: www.radiologytuts.com/courses...
➡️ ULTRASOUND QUESTION BANK: www.radiologytuts.com/courses...
➡️ MRI QUESTION BANK: www.radiologytuts.com/courses...
=========================
I have also created two RADIOPAEDIA LEARNING PATHWAYS
bit.ly/radiopaediaphysics (👈 25% OFF DISCOUNT LINK)
WHAT’S INCLUDED?
✅This UA-cam 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/radiopaediaphysics
=========================
Let's look at how field of view and frequency encoding gradient strength influence receiver bandwidth. We'll then review how receiver bandwidth determines the Nyquist limit and how we can use this to know the required sampling rate. Once we know the sampling rate we can work out the sampling time (dwell time) and ultimately calculate the amount of time we need to acquire enough samples to satisfy the x axis resolution we need.
=========================
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
Absolutely breathtaking! With 20 years spent as a radiology specialist physician , I must emphasize the immense value of this physics course. Your efforts are truly invaluable. Thank you ! 👏👏👏
you spent two decades as radiology resident??
@champsrt21 sorry my mistake 😅
thank you for dedicating your time and energy into this. thank for making these videos available to everyone.
I have watched all your X-ray series videos and got to learn a lot. You have covered X-rays of almost all the joints except the knee joint. I was wondering if you could please make a video on that as well❤
absolutely brilliant, thank you
Appreciate your dedication in providing quality content. Thank you!
Cheers. Means a lot! Thank you!
Thank you this is so helpful!
Thank you doctor
Waiting for you to upload more videos. You have made it interesting. 😊
New video out 🙂
Amazing sir🎉🎉
Thank you!
Thankyou micheal🎉🎉
My pleasure 🫱🏼🫲🏽
I wish you could've taught me everything I've gone to school for for the last 5 years
Thankyou micheal ❤❤
An absolute pleasure 🙂
Great sir❤❤
Thank you ❤️
Amazing❤❤
❤️
Thankyou micheal
My pleasure. Thanks for watching 🙂
Incorporation is different from corpration because if you work for corporation you be just a worker. Incorportion mean each member is equal in vontripution from money to labor to dicision and split equally in profit and even suffer equal lost
what is your workflow? how do you make such awesome animations?? which software you use? i am very curious to learn how to make such presentations.
Thank you. 😃
Thank you so much😂
@23:28 what’s the meaning of “specific gradient” that MRI would set according to the bandwidth? How to unfold the formula:
Bandwidth = K(G x FOV)…. Can anyone explain in simple words?
Sir colon ulcers due to amoebiasis or amoebic colitis can be detected in MRI?
I thought you have a bandwidth in z-axis too to create your slice thickness?
When is this series going to be finished and uploaded and complete
i only have one question...Would you like to sir for my MRI ARRT exam?
Thank you for creating this tutorial, this is super helpful! I have one specific question about the segment around 15:25 in the video, where you demonstrated how the signals are sampled and received by the scanner. Does that mean each data point we collect across time contains the information of all waveforms, with the limit being determined by the highest frequency we aim to achieve?
We receive the sampled data points, estimate the overall signal, then do a Fourier transform to decompose. The maximum frequency is limited by the sampling rate (due to that if there is anything beyond the limit there will be aliasing?) Is this the correct way to interpret it? Thank you very much!
You’re 100% correct ✅ exactly the way to think about it!
Thank you so much! This tutorial series is awesome, really helped me a lot in understanding the concepts.
There is something I don't understand in this part. If the gradient comes from B (z axis), shouldn't we work with a sagital image? (even if it is just a slice). I mean, the protons precessing in less frequency would be on the bottom and the ones with more frequency on the top right? not left or right...
Frequency encoding is along x axis so that makes it left or right phase encoding is along y axis so that’s top or bottom
👍
In the pulse echo mode, the usual clinical ultrasound transducer receive echo for how much of the total scan time?
1) 25%
2) 50%
3) 75%
4) 100%
Sir what's the answer
Depends on how deep you’re imaging and what the pulse duration is. But generally receive time is >98% of the pulse repetition period
Thanks❤
Sir, Is MR question bank available?
Still working on it. Need to make sure it’s perfect 😅
@@radiologytutorialsThank you
Q. Which of the following is not related with the mri acquisition time?
1 TE
2 TR
3 NEX
4 ETL
Iam preparing for my radiographer exam on 28 july
How did u do
I think it is TE ?!