3D volume data from neutron tomography acquisitions is provided as object slices perpendicular to the rotation axis. The slice images are obtained by tomography reconstruction i.e. applying inverse Radon transform to projection data (i.e. the negative logarithm of corrected radiographic transmissions). The 3D volume data can be visualized using special 3D rendering software e.g. VGStudio.
The result of processed radiography data are transmission values i.e. floating point values in the range [0-1], whereas for tomography acquisitions the reconstructed slices contain linear attenuation coefficient values in some inverse length scale. To derive quantitative information from this, the validity of the exponential law of radiation attenuation (aka Beer-Lambert law) is assumed. Thereby material composition e.g. a humidity content can be calculated.
with known Σw and pixel size ps the volume of the wet phase per pixel can be calculated: Vw = tw * ps2