i'm doing an assignment and need help. i need to identify and explain the wave properties and modes of ultrasound and the modes of interaction of ultrasound waves in tissue.
2006-06-06 20:57:40 · 8 answers · asked by amy_may_povey 1 in Science & Mathematics ➔ Physics
ultrasound is anything over what the human ear can hear over 20 kHz.
Ultrasound is produced by a transducer, this can both emit and detect ultrasound. By varying the size of the pizoelectric discs frequency of the emited ultrasound is altered.
The higher the frequency the better anatomical detail however less penatration is attchived.
there are 3 main types of scan
A-scan (ampitude mode)
This shows the differenc between tissue interfaces and is used in mesurement e.g foetal skull maturity
B-scan (brightness mode)
This shows a 2D image in a specific plane. It shows different types of tissue in gray scale. This is shown in real time. This is used to image abdominal areas.
M-scan this shows the way tissue interfaces alter with time. Moving traces produce a wavy line on the screen where static interfaces produce a straight line m scans are used in cardiac imaging to show valves of the heart.
2006-06-07 07:20:59 · answer #1 · answered by bobsypuscat 1 · 0⤊ 0⤋
Ultrasound is ultra-high frequency noise. When using it to scan a foetus it works as sonar. The different densities of flesh reflect and warp the signal so when it is received a picture can be extrapolated. If the frequency is too high or powerful however the tissue can be damaged. Ultra-Sound has been used in industry for welding!
2006-06-07 04:02:41 · answer #2 · answered by xenobyte72 5 · 0⤊ 0⤋
Ultrasound or ultrasonography is a medical imaging technique that uses high frequency sound waves and their echoes
2006-06-07 08:55:23 · answer #3 · answered by moonface 2 · 0⤊ 0⤋
Ultrasound or Ultrasonics is sound which is at a frequency above that of human perception. The inverse of this is infrasonics which is below that of human perception.
2006-06-08 11:31:54 · answer #4 · answered by Kevin C 2 · 0⤊ 0⤋
High frequency sound.
Because the wavelengh of high pitched sound is so much shorter than low pitch sound. Using echo location, very acurate picture can be made of a baby.
2006-06-07 07:56:20 · answer #5 · answered by graemefirth894 3 · 0⤊ 0⤋
its sound waves bouncing through to the baby which is why there's no detail other than outline/structure..
Try searching the net, i found a good page here:
www.radiologyinfo.org/content/ultrasound-general.htm
2006-06-07 04:00:11 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Vibrations and Frequencies above the human range of seeing and hearing.
2006-06-07 04:01:56 · answer #7 · answered by blakelycollierbrown 4 · 0⤊ 0⤋
Sound that's ultra.
2006-06-07 04:00:27 · answer #8 · answered by Sexplorer 1 · 0⤊ 0⤋