Wonderfull lectures! Whatt is in your opinion the minimal distantance between two structures the ultrasound would detect and plot correctly? In actual distantance i mean, like millimiters. Thank you very much!
06:19 in your example the two boundaries are at 1/2 SPL distance and can't be resolved so how can we consider it as the least possible resolvable distance? Shouldn't we say that the distance must be greater than 1/2 SPL and NOT the 1/2 SPL itself?
Hello ! I have a question As you described that decreasing SPL to less then 1/2 will make axial resolution to lost , and dampening causes SPL to decrease so shouldn’t the axial resolution be decreased too ?
Great video! I read a lot about ultrasound physics but your presentation is very clear and straight to the point. I would like to ask you: can I copy one image and use it in a ppt presentation I'm making for my colleagues in the ICU where I work? If you give permission, I would obviously write clearly that it's taken from your channel (with reference, http etc...as to copyright). Thank you in any case! Hope to see more videos in future!
Sorry for the delay. Absolutely. Go ahead 👍 Thank you for asking. Email me on michaelradiologytutorials@gmail.com and I can send you the original images if that would be easier for you.
Great question. Sorry for the delay! Yes, higher frequency increases focal zone depth and axial resolution. However, higher frequency waves are attenuated much more rapidly than lower frequencies. Therefore, the intensity of signal at greater depths from higher frequency waves is smaller than in low frequency waves.
If wavelength is something which changes (to compensate for speed changes) as opposed to frequency throughout tissues, then why does the SPL not change in length the deeper you go? (and therefore axial resolution reduce).
The SPL will change ever so slightly depending on the speed of the wave in the tissue. It will not be depth dependent though as the speed of the wave is not dependent on depth but rather tissue type.
Thank you soo much for these videos...really appreciate your efforts.i was wondering if you could make a video on anatomy on HRCT temporal bone please..
Love the way Axial resolution has been explained, now it totally make sense why axial resolution increases with frequency.
That's awesome! Hopefully, it makes it easier to remember 🙂
looking fwd to more videos :) they're all great and super helpful!
Thank you Ufara. Glad you like them ☺️
Wonderfull lectures! Whatt is in your opinion the minimal distantance between two structures the ultrasound would detect and plot correctly? In actual distantance i mean, like millimiters. Thank you very much!
06:19 in your example the two boundaries are at 1/2 SPL distance and can't be resolved so how can we consider it as the least possible resolvable distance? Shouldn't we say that the distance must be greater than 1/2 SPL and NOT the 1/2 SPL itself?
Quick thing, at 1:40 you say SPL is a measure of distance (which makes sense) however on the illustration you have it showing it as a measure of time.
Hello !
I have a question
As you described that decreasing SPL to less then 1/2 will make axial resolution to lost , and dampening causes SPL to decrease so shouldn’t the axial resolution be decreased too ?
Please answer this question it's quite confusing
If you decrease the SPL, shouldn't that decrease rather than increase axial resolution according to your formula: axial resolution limit = 1/2 SPL ?
Great video! I read a lot about ultrasound physics but your presentation is very clear and straight to the point. I would like to ask you: can I copy one image and use it in a ppt presentation I'm making for my colleagues in the ICU where I work? If you give permission, I would obviously write clearly that it's taken from your channel (with reference, http etc...as to copyright). Thank you in any case! Hope to see more videos in future!
Sorry for the delay. Absolutely. Go ahead 👍 Thank you for asking. Email me on michaelradiologytutorials@gmail.com and I can send you the original images if that would be easier for you.
Excellent Explanation. It helps a lot in my project.
Glad it was helpful!
with a higher frequency probe shouldn't you get a deeper focal zone? thus a Bir more depth. as well as better axial resolution?
Great question. Sorry for the delay! Yes, higher frequency increases focal zone depth and axial resolution. However, higher frequency waves are attenuated much more rapidly than lower frequencies. Therefore, the intensity of signal at greater depths from higher frequency waves is smaller than in low frequency waves.
different tissues have different wavelength and therefore SPL and therefore axial res, no?
If wavelength is something which changes (to compensate for speed changes) as opposed to frequency throughout tissues, then why does the SPL not change in length the deeper you go? (and therefore axial resolution reduce).
The SPL will change ever so slightly depending on the speed of the wave in the tissue. It will not be depth dependent though as the speed of the wave is not dependent on depth but rather tissue type.
@@radiologytutorials Thank you so much for answering!
Thank you soo much for these videos...really appreciate your efforts.i was wondering if you could make a video on anatomy on HRCT temporal bone please..
excellent work
Thank you Saleem!