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- ''For other meanings of "ultrasound" or "ultrasonic", see ultrasound (disambiguation).
Ultrasound is sound with a frequency greater than the upper limit of human hearing, this limit being approximately 20 kilohertz (20,000 hertz).
Ability to hear ultrasound
Some animals, such as dogs, dolphins, bats, and mice have an upper limit that is greater than that of the human ear and thus can hear ultrasound. Children can hear some high-pitched sounds that older adults cannot hear, as in humans the upper limit pitch of hearing gets lower with age. This frequency limit is caused by the middle ear that acts as a low-pass filter. If ultrasound is fed directly into the skull bone and reaches the cochlea without passing through the middle ear, much higher frequencies (up to about 200 kHz) can be heard. This effect (sometimes called ultrasonic hearing) was first discovered by divers exposed to a high-frequency (ca. 50 kHz) sonar signal.Medical sonography
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http://twitpic.com/up682 - Baby ultrasound at 10wks, dec 3rd.
zombiedork (zombie xmuffinx) Tue, 22 Dec 2009 21:49:58 -0000
http://twitpic.com/up682 - Baby ultrasound at 10wks, dec 3rd.
Girl next to me @ sbux was just talking about her upcoming ultrasound..now talking about how she was "soo wasted" last night..that's great.
lightsechos (michelle butterfield) Tue, 22 Dec 2009 21:46:56 -0000
Girl next to me @ sbux was just talking about her upcoming ultrasound..now talking about how she was "soo wasted" last night..that's great.
@kolbijean awww send me new ultrasound pix of our baby boy!!! <3 you muffin
debrabroberg (Debra Broberg) Tue, 22 Dec 2009 21:45:42 -0000
@kolbijean awww send me new ultrasound pix of our baby boy!!! <3 you muffin
@lizditz Interesting ultrasound/autism study, tho didn't include any kids born in the last10yrs.Ultrasound has advanced radically since then
ExcellentCandy (Kim Underwood Lyons) Tue, 22 Dec 2009 21:45:02 -0000
@lizditz Interesting ultrasound/autism study, tho didn't include any kids born in the last10yrs.Ultrasound has advanced radically since then
RT @TFLN: (218): you went through ur friends list and posted an obscene comment on every ultrasound pic...."not his" "looks like a sea m ...
KendrusD (Kendra Doshier) Tue, 22 Dec 2009 21:43:06 -0000
RT @TFLN: (218): you went through ur friends list and posted an obscene comment on every ultrasound pic...."not his" "looks like a sea m ...
Gulfcoast Ultrasound wishes everyone a happy and safe holiday season!
Gulf_Ultrasound (Gulfcoast Ultrasound) Tue, 22 Dec 2009 21:41:57 -0000
Gulfcoast Ultrasound wishes everyone a happy and safe holiday season!
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http://twitpic.com/up682 - Baby ultrasound at 10wks, dec 3rd.
zombiedork (zombie xmuffinx) Tue, 22 Dec 2009 21:49:58 -0000
http://twitpic.com/up682 - Baby ultrasound at 10wks, dec 3rd.
Girl next to me @ sbux was just talking about her upcoming ultrasound..now talking about how she was "soo wasted" last night..that's great.
lightsechos (michelle butterfield) Tue, 22 Dec 2009 21:46:56 -0000
Girl next to me @ sbux was just talking about her upcoming ultrasound..now talking about how she was "soo wasted" last night..that's great.
@kolbijean awww send me new ultrasound pix of our baby boy!!! <3 you muffin
debrabroberg (Debra Broberg) Tue, 22 Dec 2009 21:45:42 -0000
@kolbijean awww send me new ultrasound pix of our baby boy!!! <3 you muffin
@lizditz Interesting ultrasound/autism study, tho didn't include any kids born in the last10yrs.Ultrasound has advanced radically since then
ExcellentCandy (Kim Underwood Lyons) Tue, 22 Dec 2009 21:45:02 -0000
@lizditz Interesting ultrasound/autism study, tho didn't include any kids born in the last10yrs.Ultrasound has advanced radically since then
RT @TFLN: (218): you went through ur friends list and posted an obscene comment on every ultrasound pic...."not his" "looks like a sea m ...
KendrusD (Kendra Doshier) Tue, 22 Dec 2009 21:43:06 -0000
RT @TFLN: (218): you went through ur friends list and posted an obscene comment on every ultrasound pic...."not his" "looks like a sea m ...
Gulfcoast Ultrasound wishes everyone a happy and safe holiday season!
Gulf_Ultrasound (Gulfcoast Ultrasound) Tue, 22 Dec 2009 21:41:57 -0000
Gulfcoast Ultrasound wishes everyone a happy and safe holiday season!
Nuderecords.com Ultrasound - News, biography, images, sounds, and tour information from the band's label.
Meta Description: [ nude records ltd ]
VH1: Ultrasound - Biography, discography, and links.
Meta Description: [ VH1.com presents complete artist information on Ultrasound, including news, bio, message boards, song clips, Urge Music Downloads, and more. ]
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