I want to congratulate you on this incredible video lecture series and the service you are providing to students and professionals everywhere. In the coming years, our nation will continue to need educators like yourself that are keen seeing future generations prosper. Please continue this great work, as I join the American people in thanking you for making this world-class educational series free and accessible for everyone.
Thank you for this clear and brilliant description of the various modes of doppler interrogation. You are an excellent and clear communicator. Kudos! Rick Gutierrez MD
Excellent integration of physics and its concepts into the clinical aspects of the USG/Doppler. The whole series is worth watching. Thank you for such detailed video.
Hi sir, Your stated of Nyquist theorem (which read: We need to sample a returning doppler shift frequency at least twice within one wavelength). Coming from a signal processing background, I want to ask if that is the physical meaning of saying to reconstruct a signal you need to sample at least twice the sampling frequency.
Would it be correct to say that by having at least two return signals in a wave cycle, the wave function can be fitted (this is a sine wave) and thus the frequency and amplitude can be derived. That is how I can understand the Nyquist limit.
Many thx for your excellent talks. I may not understand the active region of color doppler. Outside of the box we have the general 2D picture by merging A-lines with short pulses and SPL. However, in the active region we have 2 poeces of information: A-lines in 2D-constellation and color. Color indicates as you mentioned the doppler shift. For me it is not clear that in this region we use two different pulse waves to have the 2 distinct values? Or a longer PRP enables both of them: 1) Time and intensity show us the A lines woth brightness? 2) The longer SPL allows to have the doppler shift value and position? Is this the solution or two different methods are running in parallel? Thank ypu inadvance, Tamas
It’s a difficult one. Next week I’m releasing an MRI video on aliasing (also using the Nyquist limit) and I’ve made much better illustrations. Hopefully I will be able to show how we need to sample a frequency at least twice per wavelength in order to accurately measure that frequency.
huh? So is duplex equal to spectral doppler equal to pulse wave doppler equal to continuous wave doppler? Or can you clarify the terms in short sentences?: Power doppler, spectral doppler, color doppler, duplex, pulse wave doppler and continuous wave doppler?
I’ve posted 63 videos in 70 days… I’m currently on holiday this week. Still there will be 3 videos coming out this week. Back from holiday next Wednesday
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I want to congratulate you on this incredible video lecture series and the service you are providing to students and professionals everywhere. In the coming years, our nation will continue to need educators like yourself that are keen seeing future generations prosper. Please continue this great work, as I join the American people in thanking you for making this world-class educational series free and accessible for everyone.
What are you doing here Obama
"Our nation" "The American people"
The guy is clearly south african
HE deservers a lot of honour ,appreciation and thanks, but cant find words to pay tribute comparable to his qualities, sincerity and devotion.
Thank you for this clear and brilliant description of the various modes of doppler interrogation. You are an excellent and clear communicator. Kudos! Rick Gutierrez MD
Excellent integration of physics and its concepts into the clinical aspects of the USG/Doppler. The whole series is worth watching. Thank you for such detailed video.
Thanks to you we could had a perfect presentation for our medical physics class we love you ❤🎉
Amazing video! As a first year cardiology fellow learning echo, this was immensely helpful! Thank you!
Glad it was helpful!
I salute you and pray ALLAH to bless you with the best and also wish you to be honoured with noble prize in Radiology/Physics .....AMEEN
Excellent interpretation
Man, we love you . Thank you very much. ❤
hats off sir, for your nice presentation
excellent teaching. please post more of MRI modules. need to prepare for exam
Thank you. Just finished filming the next lecture now. Will edit, render and upload tomorrow 🙂
incredible explanation! thank you!
Glad it helped!
Really brilliant! 👍
Great work!!!
Thank you 🥰
Amazing teaching ❤
Thank you Maya 🙂
Hi sir,
Your stated of Nyquist theorem (which read: We need to sample a returning doppler shift frequency at least twice within one wavelength).
Coming from a signal processing background, I want to ask if that is the physical meaning of saying to reconstruct a signal you need to sample at least twice the sampling frequency.
Where are question series
Would it be correct to say that by having at least two return signals in a wave cycle, the wave function can be fitted (this is a sine wave) and thus the frequency and amplitude can be derived. That is how I can understand the Nyquist limit.
12:48 Why does increasing the SPL narrow the bandwidth?
Many thx for your excellent talks.
I may not understand the active region of color doppler. Outside of the box we have the general 2D picture by merging A-lines with short pulses and SPL.
However, in the active region we have 2 poeces of information: A-lines in 2D-constellation and color. Color indicates as you mentioned the doppler shift. For me it is not clear that in this region we use two different pulse waves to have the 2 distinct values? Or a longer PRP enables both of them: 1) Time and intensity show us the A lines woth brightness? 2) The longer SPL allows to have the doppler shift value and position?
Is this the solution or two different methods are running in parallel?
Thank ypu inadvance,
Tamas
Please post more lectures.
Another video dropping tomorrow. The last of the ultrasound series!
Which application are using to record i want to share people with some case
Hi 👋 I'm just using powerpoint to screen record
Hi
When is the MRI module❤😢?
After ultrasound. Five more videos of ultrasound left. I’m on holiday this week so likely starting not this Monday but the next
Hilma Roads
U look like Ralph nacchio and Eddie redmayne and with your help, I’m gonna pass my physics on the 3rd try❤❤❤❤
I can't understand the nyquist limit and how fmax=PRF/2
It’s a difficult one. Next week I’m releasing an MRI video on aliasing (also using the Nyquist limit) and I’ve made much better illustrations. Hopefully I will be able to show how we need to sample a frequency at least twice per wavelength in order to accurately measure that frequency.
huh? So is duplex equal to spectral doppler equal to pulse wave doppler equal to continuous wave doppler? Or can you clarify the terms in short sentences?:
Power doppler, spectral doppler, color doppler, duplex, pulse wave doppler and continuous wave doppler?
Spectral Doppler is continuous or pulse wave Doppler.
Power Doppler is colour Doppler but without direction information
Why aren't you posting more?
I’ve posted 63 videos in 70 days… I’m currently on holiday this week. Still there will be 3 videos coming out this week. Back from holiday next Wednesday
@@radiologytutorials Insane productivity. Currently studying for the US CORE exam and these videos are awesome. Thanks for making them!
Thank you David 🙂👍🏼
@@radiologytutorials right , maybe i m expecting it everyday , i guess couldn't get enough of it 😄