Dose 2016
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
M. Schwarz
However CT is at kV energies Radiological properties relevant to MV are not directly available
Each voxel assumed to have single atomic composition and density
Assigned by a calibration curve
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