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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