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Summary

The dose discrepancy could be up to 10-15% due to the large difference

between the stopping powers of water and these higher-density materials

i.e. bone.

o

vertebrae, mandible, femoral heads…

For soft tissues and lung, the dose discrepancy is only about 1 to 2%

For air the discrepancy could be around 10-12%

o

air cavities in PTV, trachea, air cavities in intestines, rectum

o

Do we need to define air, is it OK with very low density soft

tissue/water???

April 2017

44

Slide inspired by N Reynaerts from his ESTRO 35 lecture