All of these are determined by sound source and medium  only  EXCEPT

What is the time of flight for flight for a structure at 6cm depth?

What is the final intensity if an initial intensity of 3mw/cm^2 undergoes 9dB of amplification

A high frequency probe in soft tissue has a 

A sound beam  with an initial intensity of 600mw/cm^2 is incident on an interface and propagates 3 cm in soft tissue. The frequency is 6 MHz. The final intensity after 3 cm will be 

What has the highest attenuation rate of these materials? 

What happens to scattering by a blood cell if frequency is doubled

What is the depth of reflector in soft tissue if the time of flight is 78 microsecs

  What is the primary effect of increasing the frequency of an ultrasound wave on tissue penetration? A. Decreases penetration and improves resolution B. Increases penetration and decreases resolution C. Increases both penetration and resolution D. Decreases both penetration and resolution

The shadowing below(distal to) the  the echogenic stones in the image demonstrates all EXCEPT