k-Wave

1. Anthony
   

   Member
   Joined: Apr '13
   Posts: 96

   Hi Brad,

   I have a question about the use of powerLawKramersKronig().

   I work at a frequency of 3 MHz -> w = 2*pi*3e6 rad/s
   I consider a reference frequency of 1 MHz -> w0 = 2*pi*1e6 rad/s
   Let's take a reference sound speed of c0 = 1500 m/s
   Then, in liver [Pohlhammer 1991] :
   a0 = 4.3 Np/m/MHz^y
   y = 1.266

   Now let's use the function : c_kk = powerLawKramersKronig(w, w0, c0, a0, y)
   c_kk = powerLawKramersKronig(2*pi*3e6, 2*pi*1e6, 1500, 4.3, 1.266);

   This gives me c_kk = -0.0047 m/s, which I don't understand.
   Is there a problem in the values I use?

   Best regards,
   Anthony

   Posted 8 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,640

   Hi Anthony,

   The absorption value needs to be in Nepers/((rad/s)^y m), rather than Nepers/((MHz)^y m). If you convert, I think this gives c_kk = 1501.2 m/s, which seems to make more sense.

   Brad.

   Posted 8 years ago #

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