How the sound waves (Ultra sound waves) scan the baby?

Question

Light waves can take a photograph or can be seen on the screen of the computer. But How sound waves can scan the baby which is inside the pregnant lady? How the sound waves transform into electromagnetic waves? Are they converted into eletric signals as in the case of radio?

Answer 1

"Medical Sonographic Scanner:

The creation of an image from sound is done in three steps - producing a sound wave, receiving echoes, and interpreting those echoes.

Producing a sound wave:

In medical ultrasonography, a sound wave is typically produced by creating short, strong pulses of sound from a phased array of piezoelectric transducers (usually a type of ceramic). The electrical wiring and transducers are encased in a probe. The electrical pulses vibrate the ceramic to create a series of sound pulses from each. The frequencies present in this sound wave can be anywhere between 2 and 13 MHz. The goal is to produce a single focused arc-shaped sound wave from the sum of all the individual pulses emitted by the transducer.

To make sure the sound is transmitted efficiently into the body (a form of impedance matching), the transducer face has a rubber coating. In addition, a water-based gel is placed between the probe and the patient's skin.

The sound wave is partially reflected from the interface between different tissues and returns to the transducer. This returns an echo. Sound that is scattered by very small structures also produces echoes.

Receiving the echoes:

The return of the sound wave to the transducer results in the same process that it took to send the sound wave, just in reverse. The return sound wave vibrates the transducer's elements and turns that vibration into electrical pulses that are sent from the probe to ultrasound scanner where they are processed and transformed into a digital image.

Forming the Image:

The ultrasound scanner must determine three things from each received echo: 1.) The direction of the echo. 2.) How strong the echo was. 3.) How long it took the echo to be received from when the sound was transmitted. Once the ultrasound scanner determines these three things, it can locate which pixel in the image to light up and to what intensity. Transforming the received signal into a digital image can be best explained by using a blank spreadsheet as an analogy. The transducer elements receiving the impulse determines the 'column' in our spreadsheet (A,B,C,etc.). The time that it took to receive the echo determines the 'row' (1,2,3,etc.), and the strength of the echo determines the brightness that the cell should change to (white for a strong echo, black for a weak echo, and varying shades of grey for everything in between.)"

This, and more, from Wikipedia, the free, online encyclopedia at:
http://en.wikipedia.org/wiki/Medical_Sonography

Hope this helps!

Answer 2

The sound waves are reflected by an interface between a liquid and a material more compact and the higher the frequency, the fraction of ultrasound reflected increases. So, If you send ultrasounds on n organ , the ultrasound will be reflected by the membranes or the compartments of organs. Once more, the directivity and the localization of ultrasounds is very high. So sending ultrawaves and
collecting the echoes with an electronic device gives good imaging

Answer 3

Your uterus is a very reliable muscle and protects the toddler from any actual injury from the ultrasound device. there is a few argument approximately regardless of if the sound waves--quite interior the hot "4-D" ultrasound machines is risky in great volume to a coming up fetus's listening to. even nevertheless, it quite is as a rule well-known via the regularly occurring public of physicians that some ultrasounds for the era of your being pregnant are no longer risky in any thank you to the toddler. There are some extremists accessible who experience that ultrasounds are very risky. whilst thinking regardless of if to have faith them, evaluate what number little ones are born completely everyday on a daily basis whose mothers have had diverse ultrasounds and additionally what number little ones are born with problems because of the fact their mothers did no longer have suited pre-natal care. it quite is everyday for them to press very problematic before everything of a being pregnant so as that they could get reliable photos. This rigidity is lessened because of the fact the toddler grows because of the fact it turns into much less complicated to "see" with the ultrasound. An ultrasound is basically a diagnostic gadget. There are basically some prenatal problems that they could *resolve* with the counsel provided via the ultrasound. subsequently, in case you're uncomfortable with having an ultrasound--the two bodily or mentally, you could basically decline the service. in case you had purely a tiny brown dot, i does not subject approximately it, even nevertheless it does not injury so which you will take it person-friendly for some days. I had bleeding at 4 weeks, basically days once I found out i became unexpectedly and *finally* pregnant. I had an ultrasound that nighttime and observed his beating coronary heart--i became scared to dying i might lose the toddler we'd been attempting for 5 years to conceive. I placed myself to mattress for 3 weeks because of the fact i became so freaked out... yet i did no longer lose the toddler that each and all the scientific medical doctors appeared to think of i might. he's now a three-a million/2 3 hundred and sixty 5 days old lively, wholesome sweetheart. reliable success and congratulations! :)

Answer 4

the sound waves bounce off baby, how they return to the scanner is interpreted and a visual representation is what you see on the screen. its kinda like sonar.