Tissue Harmonic Ultrasound Imaging | Ultrasound Physics Course | Radiology Physics Course #24
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- čas přidán 7. 05. 2023
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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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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.
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The first order harmonic equals the fundamental frequency. You misworded it. The second harmonic is 2*f0
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!
Well explained!!! Shukran
You've made an amazing resource for budding radiologists here ! Awesome job man ! Keep it up
Thank you Jay 🙂
Thanks for making great material. For suggestions, you should include examples of ultrasound images.
Well explained
Thanks for crystal clear articulation of technical concepts through fundamental application.
Glad you're enjoying the videos 🤗
. 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
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 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!
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
Wonderful..best exlanation i ever heard of harmonics..keep it up
Thank you!
Bro this is by far the best video explaining the method!!
Thanks mate 👊🏼
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?
Great lecture.
Thank you Shweta 🙂
Excellent lectures !! When can we expect the artifacts and safety video .
Artifacts tomorrow and safety on Friday 🙂
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!