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1. kdreher
   

   Member
   Joined: Jul '19
   Posts: 4

   Hello,

   I would like to combine two attenuation coefficients in one voxel for simulating with blood perfused tissue. I know that the attenuation is calculated by a = a_0 * f^y.
   For example: If I want to combine two substances (e.g. 99% water and 1% blood), I could define my attenuation as a_tot = 0.99 * a_0_water * f^y_water + 0.01 * a_0_blood *f^y_blood.
   But I can't define different y-values for different voxels and I can't analytically bring this equation to the form a_tot = a_0_tot * f^y_tot, so that I can have one y_value for all voxels.
   What do you think I could do to simulate this as realistically as possible?

   Sincerely,
   Kris

   Posted 4 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi Kris,

   Do you have broadband signal or a single frequency / tone burst? If you can fix your frequency, then you can calculate the total attenuation in the voxel in dB/cm. Then you can convert this back to values for alpha_coeff by fixing f and alpha_power (e.g., to 2).

   Hope that helps,

   Brad.

   Posted 4 years ago #

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