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The higher the frequency the shorter the wavelength, so by the physics of sound waves, the smaller the objects that can reflect the sound back. Hence using ultrasound, with its very short wavelengths, the better the definition attainable.

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5y ago
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11y ago

tthe body producing sound is always vibrating.but the sound of every vibrating body can not be heard.human can only hear sounds having frequency between 20hz or 20000 hz.the sound having frequency are called ultrasonis .so ultrasonics are not audible.

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Q: Why are sonograms made with ultrasound waves instead of audible waves?
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What is focal hypoechogenicity?

, I have done some research on this because I recently had a ultrasound on a mass whaich stated there was a central focal area of hypoechogenicity. According to the Merriam-Webster online Medical dictionary, "echogenic" means: reflecting ultrasound waves and "hypo" means: less than, below, or under Therefore, hypoechogenicity could refer to something that does not reflect ultrasound waves well (or uniformly). Generally, this would be a more firm or dense mass like mine. Hopefully this helps!


Why isn't ultrasound used to examine bones and lungs?

Because ultrasound works by passing sound waves through tissue and measuring their return by deflection on a surface back to the ultrasound probe. Bone is a high density material, so reflects a high fraction of the sound waves back to the probe, making it difficult to measure different density. The lungs are filled with air, which a low density material, so the sound waves pass through the lung, and a small fraction are deflected, which makes visualising tissue very hard. This answer is now in the museum of history of medicine. Ultrasound is very useful for lung examination in patients. It is now possible to quickly examine a patient for pulmonary edema, pneumothorax, pleural effusion, ARDS and many other diseases. Please go to google and search for "Lessnau".


Why does the ear pick up sound waves instead of light waves?

The two are different because Sound waves are longitudinal mechanical waves, but light waves are transverse electromagnetic waves, and sound requires a medium through which to travel, but light doesn't. Basically, Sound waves move sort of differently than Light waves.


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Related questions

Why are sonograms are made with ultrasound waves?

it is because ultrasound help us to hear sound.it helps to see the muscles tendons and many organs to capture size and structure


What is the difference between the sound waves and ultrasound?

Difference is in their frequency, audible sound waves is between 12 Hz and 20,000 Hz, Ultrasound waves is any sound that has a frequency beyond the 20,000 Hz limit


What is the purpose of sonograms?

In a sonogram, ultrasound waves are sent to the part of your body being examined, and these waves are displayed as images. These images help doctors to determine if there are any abnormalities in the area of the body being examined. Sonograms are also used to allow pregnant women and their doctors to see a baby before it is born.


What is ultrasound?

Ultrasound is sound which has a frequency higher than that of audible sound.( like radar )ADDED: Not like radar. That uses radio waves, although sonar and radar principles are similar.


What wave that need a medium in order to propagate?

All sound waves, be that ultrasound or audible sound. Likewise water waves...


How are sonograms produced?

Sonograms are used to look at things inside the body including organs, blood vessels, bones, and fetuses. They are basically sound waves that are reflected off of different tissues. They are then received and displayed on a monitor. It works in much the same way RADAR is used to detect aircraft that are in the air, except they use sound waves instead of radio waves.


What are ultrasound?

Is cyclic sound pressure with a frequency greater than the upper limit of human hearing. Ultrasound imaging is a common diagnostic medical procedure that uses high-frequency sound waves to produce dynamic images (sonograms) of organs, tissues, or blood flow inside the body.


Sonograms Versus X-Rays?

Unlike x-rays, sonograms are completely harmless and do not involve radiation. They simply involve high-frequency sound waves that allow an ultrasound technician to see organs, muscles, tendons, and tissues. An ultrasound's only effect is warming of the tissues at which it is directed. The process is so safe that one of its main uses is on pregnant mothers and fetuses. The procedure is also non-invasive and painless. Uncertainties about this technology are of the past.


What is the difference between infrasound and ultrasound?

Ultrasound is above 18 kilohertz. Infrasound is below 20 hertz.


What is Endorectal ultrasound?

Endorectal ultrasound (ERUS) is a procedure where a probe is inserted into the rectum and high frequency sound waves (ultrasound waves) are generated


What is the difference between ultrasonic and infrasonic sound waves?

The sound waves which are below the audible sound are called infrasonics(<20Hz) and The sound waves which are above the audible sound are called ultrasonics(>20KHz).


What is different between infrasound and ultrasound?

Infrasound is sound that is lower in frequency than 20 Hz (Hertz) or cycles per second, the normal limit of human hearing. Ultrasonic waves have frequencies above the audible range at around 20 kHz. Audible sound is within human hearing range.