Which energy used for attenuation?

[Wapity]

Hello,
Congrats for your very interesting and useful work,
Could you tell me which levels of energy you used for approximating the bone and tissue absorption? Which spectrum of energy you sampled? of normal Xray tube?
Actually simplified_bone_absorb_2d.pt and simplified_tissue_absorb_2d.pt are networks to encode the attenuation transform which should be just mu(m,E) * thickness right ?
That you took from Hubbell, J. H.; and Seltzer, S. M. 1995. Tables of X-ray mass attenuation coefficients and mass energy-absorption coefficients 1 keV to 20 MeV for elements Z= 1 to 92 and 48 additional substances of dosimetric interest. Technical report, National Inst. of Standards and Technology-PL, Gaithersburg, MD (United . . . . ?
Thank you for your light

[cpeng93]

For details, yo ucan refer to the ct2xray() function in models/ct2xray_real_gan_meta.py, which first scale the voxel values to an attenuation range, and projects different material to obtain a representation of thickness.

bone_absorb and tissue_absorb are basically simplified point-wise calculation of attenuation, where the energy levels are simplified to 10 and the material is simplified to two. Here they are represented in a 1X1 conv layer, but the concept is the same.

[Wapity]

Thank you for the explanation I see it more clearly,
Do you know from which spectrum you sampled the energy levels?
Classical Xray tube with 120keV ?
I would like to use your nice module with a different energy