1/ for reflection to occur, the Z of medium....... must be greater than the Z of

Question

1/ for reflection to occur, the Z of medium....... must be greater than the Z of medium.......

2/since blood cell tend to be tiny with respect to the wavwlength of diagnostic ulrtasound, what type of reflection would you expect?

3/ using a 2 MHz transducer, if an ultrasound beam goes through 15 cm of soft issue, how much beam attenuated in (dB) will have occured?

4/using a 5 MHz transducer, how much attenuation would  occur to a beam(round trip) to and from a structure 5 cm deep in tissue?

5/using a 4 MHz transducer, at what depth would a 50% rate of attenuation occur?

Explanation / Answer

1) The z of the medium from which light is incidenting on the interface must be greater than z of the medium in which light is trying to go.this is a case of TIR.

2)Total internal Reflection(TIR)

3)Attenuation= Attenutaion coefficient * frequency * Length , Now you can easily calculate for other parts also.

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