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