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General velocity of sound equation:
1.54mm/us = MHz x mm
Velocity of sound = frequency x wavelength
Frequency in relation to resolution:
high frequency = high resolution
Low frequency = low resolution
Wavelength in relation to penetration depth:
longer wavelength is needed to penetrate deeper into the body.
E.g. for structures closer to the middle of the body
Period (T) formula:
T (us) = 1/f(MHz)
Note 
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