k-Wave

1. alcebrui
   

   Member
   Joined: Jun '13
   Posts: 1

   First of all, thanks a lot for this amazing tool, it is really powerful and intuitive!

   My question is regarding the units shown for the volume rate of heat deposition in the plot of the example "Heating by a focused ultrasound transducer". In subplot 232, the y label indicates kW/cm^3 and in the corresponding code the variable for the volume rate of heat deposition is multiplied by a factor 1e-7, i.e., Q * 1e-7. Looking into the documentation Q is supposed to be in S.I units (W/m^3), so I would expect to have Q * 1e-9 if the desired units are kW/cm^3. Am I missing something there?

   Thanks!

   Posted 4 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,640

   The simulation is in 2D, so the units should be in W/m^2 or kW/cm^2. So the conversion is correct, but the colour bar label is wrong. We’ll fix this for the next release - thanks for posting.

   Posted 4 years ago #

3. Ishmael111
   

   Member
   Joined: Feb '19
   Posts: 1

   I also would like to thank for this wonderful tool!

   And I also can't figure out what units of volume heat deposition in this example.

   It is calculated by formula "Q = alpha_np .* p.^2 ./ (medium.density .* medium.sound_speed);"
   where [alpha_np] = Np/m, [p] = Pa, [medium.density] = kg/m^3, [medium.sound_speed] = m/s
   And above combination of these units gives us units of Q as [Wt/m^3].

   What am I missing?

   Thanks in advance for answer!

   Posted 1 year ago #

4. bencox
   

   Developer
   Joined: Mar '10
   Posts: 285

   Hi Ishmael111,

   Looks as though you have an extra t in there. Should be units of power per unit volume.

   Best wishes
   Ben

   Posted 1 year ago #

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