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.

Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

[alevelsdemystified]

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-jplm]

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.

[googoothedoo]

You make this topic so interesting! Thank you!

[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.

[thesmoulder]

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.

[yogeshnalam]

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

[solo_pursuits_]

Eight years ago and it is still relevant😮

[pankajjoshi]

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

[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?

[Drjeffreydsperlingmd]

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

[Ranyaayoubi]

What do you mean by interface? Thank you!

[ih]

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!

[TheChange]

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