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Ultrasound of how much frequency is beamed into human body for sonography?
A
15 - 30 MHz
B
1 - 15 MHz
C
45 - 70 MHz
D
30 - 45 MHz
Detailed Solution
Sonography (ultrasound imaging) uses high frequency sound waves, far above the range of human hearing.
Ultrasound in the frequency range of 1 - 15 MHz is beamed into the body from a transducer.
The waves are reflected from the boundaries between tissues of different densities, and the echoes are converted into an image called a sonogram.
Lower frequencies in this range penetrate deeper, while higher frequencies give better resolution of structures near the surface.
The technique is safe because it does not use ionising radiation, so it is widely used to examine the foetus in the uterus and organs such as the kidney, gall bladder and heart.
So the frequency used is 1 - 15 MHz.
Ultrasound in the frequency range of 1 - 15 MHz is beamed into the body from a transducer.
The waves are reflected from the boundaries between tissues of different densities, and the echoes are converted into an image called a sonogram.
Lower frequencies in this range penetrate deeper, while higher frequencies give better resolution of structures near the surface.
The technique is safe because it does not use ionising radiation, so it is widely used to examine the foetus in the uterus and organs such as the kidney, gall bladder and heart.
So the frequency used is 1 - 15 MHz.