Dose Course 2018_Flipping book

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