May ALLAH Reward you AND BLESS you with the BEST in this world and Hereafter. I have nothing better than this prayer to pay you thanks and you will find this sufficient, in sha ALLAH. AMEEN.
The way you explain and make me understand so clearly all the myths about Ultrasound physics is magical! Thanks very much :) I will recommend your amazing channel to my cohorts who are also struggling to understand the old-school physics lectures at uni.
Thank You for this brilliant video. The sound waves reflect if they encounter a boundary (two mediums with different densities). But how come? Why do they reflect exactly? They could have just all change their speed/wave length and proceed further into the new medium. So why do they reflect? Thank You for Your answers!
Hi doc i am preparing for part 1 primaries and i see there is no mammogram, nuclear medicine and we only have few lectures on a ct scan. Can u kindly advise imthe way foward regarding this issue.
Pls advise prof the examz are around the corner and i did all the physics u uploaded and anatomy. Will i be fine with only your slides and question banks
Everything has an acoustic impedance - a brick wall, air, paper, olive oil. If it can vibrate (and everything can, given enough energy), it will have an acoustic impedance.
Pleasure. Yes, reverberation artifact occurs between two highly reflective interfaces (ie the tissues forming each interface have a wide difference in acoustic impedance values). They also need to be parallel to one another 🙂
Hi Michael, I have a question about this acoustic impedance equation. If I understand correctly, the higher the acoustic impedance of a tissue, the slower sound propagates through that tissue. So the speed of sound through a tissue is inversely proportional to the acoustic impedance of that tissue. But this equation (z=pc) seems to suggest the opposite. If acoustic impedance (z) equals the product of density (p) and the speed of sound (c), then as c increases, z will also increase. So how can this equation be used to determine the degree of acoustic impedance if it entails that z and c are directly proportional, when in fact they are inversely proportional?
Great question. The false assumption you’ve made is that high acoustic impedance means slower sound. This is incorrect. In general terms higher acoustic impedance tissue (eg bone) propagates sound quickly and low acoustic impedance (eg air) propagates sound slowly. Speed is purely determined by the bulk modulus and density of the tissue. Hope that helps
@@radiologytutorials I've just got lost in the same assumption, I could not make up the difference between what is acoustic impedance Vs sound wave speed as both seem to depend on Bulk modulus but in opposite relation!? So is it like we're saying the stiffer "less compressible" the tissue, the sound wave is transmitted faster within that tissue but will resist the sound wave transmitted through it, and as this is applied at tissues boundary level where the greater acoustic impedance of one will reflect "due to resisting the wave transmission" most of the wave back to the transducer at that level of interference?
May ALLAH Reward you AND BLESS you with the BEST in this world and Hereafter. I have nothing better than this prayer to pay you thanks and you will find this sufficient, in sha ALLAH. AMEEN.
The way you explain and make me understand so clearly all the myths about Ultrasound physics is magical! Thanks very much :) I will recommend your amazing channel to my cohorts who are also struggling to understand the old-school physics lectures at uni.
Thank you 🙏🏻 you’re too kind!
Your videos are amazing. You explain the concepts so well, its easy for me to understand. Thank you!
I studying Geophysics and was looking for Acoustic Impedance for Seismic waves.
From Different Lithological layers to body tissues
It's helpful 😊
Interesting! Glad it was helpful in some way 🙂
Finally caught up with the lectures...
Wonderful teaching everytime.. stay blessed 😊
Wow Outstanding Performance dr Micheal ,big thanks
Thanks ❤. Great video. Helped me a lot to clear misconceptions.
Your videos are really life-saving
So glad you're finding them useful 🥳
Thank you so much, i love you 😭😭😭❤️❤️❤️❤️❤️
Best. Waiting for MR lectures.
thank you so much for explaining this so well!
Thank you. You're so welcome!
Thank You for this brilliant video. The sound waves reflect if they encounter a boundary (two mediums with different densities). But how come? Why do they reflect exactly? They could have just all change their speed/wave length and proceed further into the new medium. So why do they reflect? Thank You for Your answers!
V nicely explained.
Thank you so much 🙂
Amazing lecture
Thank you Muhammad!
Hi Michael
Great explanation.
I have a doubt.... what is the exact difference between acoustic impedance and specific acoustic impedance
Thanks
Hi doc i am preparing for part 1 primaries and i see there is no mammogram, nuclear medicine and we only have few lectures on a ct scan. Can u kindly advise imthe way foward regarding this issue.
Are you using a textbook?
@@radiologytutorials i use your videos prof and i love your content. Pls advise because i know u can advise better
Pls advise prof the examz are around the corner and i did all the physics u uploaded and anatomy. Will i be fine with only your slides and question banks
Is the acoustic impedance property related only to biological tissue or can also considered for other materials and fluids as well?
Everything has an acoustic impedance - a brick wall, air, paper, olive oil. If it can vibrate (and everything can, given enough energy), it will have an acoustic impedance.
Thankyou this was very helpful.
Is it accurate to say reverberation artifact occurs between 2 or more interfaces with high acoustic impedance?
Pleasure. Yes, reverberation artifact occurs between two highly reflective interfaces (ie the tissues forming each interface have a wide difference in acoustic impedance values). They also need to be parallel to one another 🙂
Hi Michael, I have a question about this acoustic impedance equation. If I understand correctly, the higher the acoustic impedance of a tissue, the slower sound propagates through that tissue. So the speed of sound through a tissue is inversely proportional to the acoustic impedance of that tissue. But this equation (z=pc) seems to suggest the opposite. If acoustic impedance (z) equals the product of density (p) and the speed of sound (c), then as c increases, z will also increase. So how can this equation be used to determine the degree of acoustic impedance if it entails that z and c are directly proportional, when in fact they are inversely proportional?
Great question. The false assumption you’ve made is that high acoustic impedance means slower sound. This is incorrect. In general terms higher acoustic impedance tissue (eg bone) propagates sound quickly and low acoustic impedance (eg air) propagates sound slowly. Speed is purely determined by the bulk modulus and density of the tissue. Hope that helps
@@radiologytutorials Good to know. Thanks!
@@radiologytutorials I've just got lost in the same assumption, I could not make up the difference between what is acoustic impedance Vs sound wave speed as both seem to depend on Bulk modulus but in opposite relation!?
So is it like we're saying the stiffer "less compressible" the tissue, the sound wave is transmitted faster within that tissue but will resist the sound wave transmitted through it, and as this is applied at tissues boundary level where the greater acoustic impedance of one will reflect "due to resisting the wave transmission" most of the wave back to the transducer at that level of interference?
Great
Please sir make video on ultrasound artefact
Definitely! Probably in about 10 days time 👌🏼
I hate physics I wish I wasn’t sleeping during lecture