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Each voxel assumed to have single
atomic composition and density
Now: Patient represented by large number
of voxels each with a Hounsfield number
However CT is at kV energies
Radiological properties
relevant to MV are not directly
available
M. Schwarz
Assigned by a calibration curve
For non-water and direct simulation of
radiation transport need:
•Electron Density
•Mass Density
•Chemical composition