what is a ultasound?

Answer 1

An ultrasound is high frequency sound waves.

http://www.utriloginternational.com/eng/usbf.htm
Ultrasound

Ultrasound waves are mechanical vibrations of frequency higher than audible vibrations. These vibrations can emulsify a heterogeneous medium as a mixer would: they also produce accelerations of thousands of "G" (gravitational constant), as in a centrifuge.

Ultrasound can generate heat and cavitation. Heat is produced by absorption (imperfect transmission) of the vibrational energy: it is proportional to the vibrational energy and to the capability of the medium to convey this energy.
Cavitation is the void appearing between molecules at very high vibrational levels.
Stable cavitation is accompanied by light heat.

Unstable cavitation (too high power and improper frequency) is accompanied by burns and implosive destruction.

Ultrasonics has several applications in medicine and surgery:

High-frequency, low-power diagnostic ultrasound.

High-frequency, medium-power physiotherapy ultrasound.

Ultrasound or shock waves for destroying calculi (lithotripsy).

Surgical ultrasound of various frequencies, focused on a few square millimetres
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DIAGNOSTIC ULTRASOUND
Diagnostic ultrasound uses the reflection of vibrations from tissues of different densities. These reflections are materialized and located by a cathode-ray tube by measuring reflection time versus distance.
Due to the high frequency (1 to 7 MHz), it is possible to focus on the tissues of interest, and the improvements in detection sensitivity make it possible to use very low energy (a few milliwatts).

PHYSIOTHERAPY ULTRASOUND
Physiotherapy ultrasound uses the micro massaging principle, causing expansion of the blood vessels and promoting the permeability of tissues nourished by impregnation, thereby detoxifying them. The frequency, about 1 megahertz, is well absorbed by the tissues. The heat emitted is a secondary active principle.

LITHOTRYPTIC ULTRASOUND OR SHOCK WAVES
The lithiasis-crushing lithotrypters use shock waves (instantaneous pressure changes) which arise and die out at ultrasonic speed. The shock wave goes through living tissue along rays focused on the stone. The energy of each ray is low enough to preserve sound tissue and high enough at the focal distance, on the ray axis.

SURGICAL ULTRASOUND
Unlike the laser, surgical ultrasound will break up the tissues without excessive burning. Its accuracy, however, is much lower than that of the laser, and its use is more problematic. Surgical ultrasound uses cavitation by focusing the waves on a small area.

CELLULITIS AND THE LIPOCAVITRON®™
The action of ultrasound on living tissues has been well known since a long time. New demands for treatment of adipose tissues prompt physicists to research new applications in the medical and surgical field.

In surgery, it is necessary to liquefy the fatty cells by making them resonate in contact with a probe delivering 4 to 6 W/mm². An emulsion of the cell membrane and bodies is produced, which can be drained or sucked out. The tip of the probe has a very small area, and it is difficult to quickly handle large volumes.

In medicine, this energy must be distributed over several square centimetres for longer times, or even in several sessions, leaving it to the body to drain the progressively released fatty substances.

The problem is that , usually, 1 MHz medical ultrasound is generated by a 6 cm² spot-beam projector which must be moved slowly across large areas. For a session to be really effective, 8 hours' scanning would be required. The tissues would have had the required 10 minutes' treatment per cm².
In addition, the 1 MHz frequency is more effective on the smallest constituents, and the risk of damage to the nerves, small vessels and globules is high. It is preferable to choose frequencies close to high-pitched sound and, still better, to modulate this frequency very quickly to avoid standing waves (at constant pressure). Therefore it is necessary to obtain pressure waves moving at the pace of the modulation, in an "accordion" fashion, and avoid habituation.

UTRILOG INTERNATIONAL overcame these difficulties by developing the LIPOCAVITRON®™ USG 100.

The LIPOCAVITRON®™ is made up of one low-frequency (29KHz) ultrasound generator USG 100 and multi-heads integrated transducers with floating cells. The floating cells have the advantage of being active on the whole of their surface and not only in their centre.

The LIPOCAVITRON®™ , used for Ultrasonolipolyse®™, uses transducers made up of flat rectangular plates of different sizes, covered with a protecting film to perform what required once enormous facilities, e.g. bathtubs lined with transducers the action of which unfortunately could not be accurately localized to apply the necessary power

Answer 2

An ultrasound, basically, is a tool used to get a visual image of your child while they are still in the womb.

But for a more technical definition, here is what I found....

Ultrasound imaging, also called ultrasound scanning or sonography, involves exposing part of the body to high-frequency sound waves to produce pictures of the inside of the body. Ultrasound exams do not use ionizing radiation (x-ray). Because ultrasound images are captured in real-time, they can show the structure and movement of the body's internal organs, as well as blood flowing through blood vessels.

Conventional ultrasound displays the images in thin, flat sections of the body.

Hope this helps! Good luck to you!

Answer 3

Ultrasound examination, also called diagnostic medical sonography or sonography, is an imaging method that uses high-frequency sound waves to produce precise images of structures within your body

Answer 4

it is a machine that show you a clear view of your unborn.