Tissue Harmonic Ultrasound Imaging | Ultrasound Physics Course | Radiology Physics Course #24
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- เผยแพร่เมื่อ 2 ต.ค. 2024
- High yield radiology physics past paper questions with video answers
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Harmonic ultrasound imaging is a technique used to improve contrast and image quality in ultrasound imaging. Harmonics are integer multiples of the fundamental frequency of an ultrasound pulse. Tissue harmonics occur in high intensity regions of the ultrasound beam and form as a result of non-linear behaviour of the ultrasound wave.
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. At present, the 2nd harmonic is being used to produce the image because the subsequent harmonics are of decreasing amplitude and insufficient to generate a proper image…. (From Radiopaedia)
In our textbooks too, the fundamental frequency is considered to be the first order and then 2f0 ( which u call first order) has been named as second order harmonic… please comment
One small suggestion is to include clinical images side by side to cement your points. It helps integrate the concepts more pragmatically and make them clinically intuitive. For example, when you state a disadvantage is decreased axial resolution it would be helpful to point this means reduced depth of beam penetrance. Similarly, side lobe artifacts or the degree of lateral resolution gained could be accompanied by pics.
Very well explained! I’m not a physicist nor a radiologist (I’m a critical care specialist with certification in diagnostic echocardiography and point of care thoracic ultrasound), but your presentation is one of the best I’ve seen. 👍👍👍
Thank you 🤗 love that the videos are applicable to so many more specialties than I had originally thought!
Omg this is so amazing and helpful, as my final board exams near by,you really saved me a lot……also please can you take class on the Usg elastography..
The first order harmonic equals the fundamental frequency. You misworded it. The second harmonic is 2*f0
Is it ?? Somewhere in farrs they says it first order somewhere 2nd .
Thanks for crystal clear articulation of technical concepts through fundamental application.
Glad you're enjoying the videos 🤗
Great video!! Quick question professor, why do other sources say to use the 2nd order harmonic instead of the first order? Other sources say 2Fo is the second order harmonic but you say 2Fo is the first order… I just need some clarification is all! Thank you again prof!
Thank you so much for your time and efforts. You made physics understandable. You are the best.
Wow, thank you 🙏🏻 so glad they’ve helped!
Great lecture.
Thank you Shweta 🙂
Well explained
Thanks for making great material. For suggestions, you should include examples of ultrasound images.
Why does non-linear behaviour only cause frequencies that are a multiple of the original frequency to form and not say 1.2*original frequency or anything not a whole number?
why does propagation speed of ultra-sound increase if the density of the tissue increases? It's counter-intuitive.
It doesn’t 🙂 It increases as the stiffness/ resistance to compression increases (bulk modulus)
@@radiologytutorials Thank you. So if the resistance to compression increases, the propagation speed increases, but why? If the resistance to compression is high, shouldn't the wave be stopped or very much attenuated and its speed be decreased?
Best way I can think to describe it is that “stiffness” increases the propagation of energy. If you have a syringe filled with water and another filled with air and you occlude the end with your finger. When you press the plunger down the pressure on your finger occluding the syringe will be much higher with the water filled syringe because it resists compression. Hope that makes some sense 😅
Resistance to compression does not mean resistance to the transfer of energy. A steel hammer transfers energy better to a nail than a foam hammer. Although particles resisting compression seems like it should cause the wave to be slower it in fact makes them better at transferring energy. Which is ultimately what a wave is - a transfer of energy 🙂
Thank you very much for your kind and clever reply!
Your course is currently contributing in by journey of studying Doppler Ultrasound here in Nigeria. Thank You for this resources. You teach very well❤❤❤❤
Thank you! Best wishes from South Africa
Where are you studying doppler ultrasound in Nigeria please,I am also in Nigeria
Спасибо за ценную информацию
Wonderful..best exlanation i ever heard of harmonics..keep it up
Thank you!
Well explained!!! Shukran
You've made an amazing resource for budding radiologists here ! Awesome job man ! Keep it up
Thank you Jay 🙂
Excellent lectures !! When can we expect the artifacts and safety video .
Artifacts tomorrow and safety on Friday 🙂
Bro this is by far the best video explaining the method!!
Thanks mate 👊🏼