Out of Field Dose Reduction by Geoffrey Ibbott, PhD
Out of Field Dose Reduction by Geoffrey Ibbott, PhD
Out of Field Dose Reduction by Geoffrey Ibbott, PhD
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Summary• No consensus as to the best measurement technique.Calculations will play a larger role in the future.• Increases in the secondary dose are highly dependent onthe number <strong>of</strong> MUs and photon energy.• Measurement <strong>of</strong> the secondary dose requires anestablished NIST traceable technique and characterization<strong>of</strong> the dosimeters at the appropriate energies.• New treatment planning s<strong>of</strong>tware with better optimizationroutines have reduced the number <strong>of</strong> MUs per treatmentreducing the secondary doses.• Neutron dose may play less <strong>of</strong> a role than previouslythought.
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