Ultrasound medical imaging | Mechanical waves and sound | Physics | Khan Academy

You can actually use sound to create images of the inside of the body. Wild! Created by David SantoPietro.
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[@alevelsdemystified3410]

Wow ,your whole explanation of why ultrasound was used instead of audible sound due to its low wavelength leading to less diffraction was great.

[@AC-jp1lm]

Thank you! I'm starting my cardiac sonography program in a few months. This was very helpful to get a bit of a head start in understanding the subject.

[@pankajjoshi2032]

Hi. How much physics is there in the program ? Thank you.

[@AC-jp1lm]

@@pankajjoshi2032 A lot. Ultrasound is physics.

[@googoothedoo]

You make this topic so interesting! Thank you!

[@thesmoulder7613]

I can remember hearing the sound of an ultrasound while I was in my mother's womb, but no one believes me and damn near everything I read on google search says it's not possible.

[@vilenaantonova235]

crazy interesting
ive wondered what babies hear; i wonder if its bad

[@Revion91]

Nobody believes you because this is impossible. Babies cannot form memories and never have been able to. The memory you have is indeed a memory, but it is a confabulation.

[@courtneyn4157]

I believe you

[@yogeshnalam1950]

What happens if we point ultrasound waves in air without any interface. Will it generate some pressure in the region it passes through ?

[@VickiBee]

Don't I know THAT about patients. When I first became an EKG Technician, there were so many patients who DIDN'T want me giving them an EKG, because lots of them were worried about being electrocuted by it, it wasn't even funny.
This one guy gave me such a third degree of questioning that his girlfriend suddenly said "You act like she's fittin' to KILL you."
He mumbled a protest and she rolled her eyes.
I had to bite my tongue to keep from laughing.

[@mushtaqsiddiqisiddiqi8002]

655

[@ksk_futuremvrcreator]

3:45 I love this

[@solo_pursuits_]

Eight years ago and it is still relevant😮

[@morezco]

Thank you 🫶🏻

[@user-ni6id3zy3r]

Thanks 🙏

[@pankajjoshi2032]

Hi. How much physics is there in the program ? Thank you.

[@ih1602]

Hello, in FOCAL DEPTH, HIGH FREQUENCY creates DEEP FOCUS. But when you choose most useful Transducer for imaging deeper structures,why the correct answer is “3MHZ LONG FOCUS” instead of “5MHZ LONG FOCUS”?🤦🏻‍♀️ I’ll appreciate your help!

[@zolaedwards5479]

Hi! I am not an expert, but am in ultrasound school learning this stuff. As sound travels, it loses energy because of resistance in the medium, absorption of sound energy and reflection when it hits a boundary between structures. This is called attenuation. Sound with higher frequencies lose energy more quickly than sound with low frequency. Every time the beam hits a boundary between structures, some of it reflects back to the transducer, some is absorbed by the tissue, and some continues through the boundary. Since High frequency sound loses its energy more quickly, it can not travel as far as low frequency sound. Low frequency loses energy more slowly which is why it can penetrate deeper into the body, making it useful to image abdominal organs. High frequencies do not penetrate as deep but shows more detail. It is used for more superficial structures, such as the thyroid gland in the neck.

[@Kiran.2020]

You are the best ❤️

[@wenwu-xu]

if that is the case using high f (which would result in low wave length) is better, does this mean the higher f the better image quality and people are using as high as possible of the f in practical?

[@SLCooper14]

Yes, high frequency(short wavelength) gives overall better resolution(Lateral and axial) but since attenuation is an important factor in Ultrasound, there is always a compromise.

[@AwalJeylan-yv6gt]

tnx

[@UnderdogDen]

this saved me from failing thanks!!!!

[@Ranyaayoubi]

What do you mean by interface? Thank you!

[@sergiop753]

+Ranya A an interface is the part in which two different mediums get in tough, in this case, the space between a tissue and blood or intersticial fluid.

[@akileshms5560]

U r a UltraLegend

[@Sabzworld77]

wow !! thnx alot

[@I34R]

I think I'm in love

[@yasameenghazy8047]

thanks a lot excellent video

[@TheChange342]

Why after the first reflection of sound wave from the interface the sound waves continues to move further through the medium
wheather the change in density was not for the second wave

[@MLDawn]

you rock!!!

[@Naveen-ur4dm]

College❌ khan academy✅

[@Drjeffreydsperlingmd]

That's gotta be Dr. Chris Fox! Legend!

[@richolikha1389]

Animation work this video ultrasound

[@user-zn6dk5cg3e]

مفيش نسخة عربية

[@es6645]

its 200HZ TO 20000

[@lilgooseboi7354]

No it isn't

[@shehransalam4838]

Wrong