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Learning Objectives

To give an overview of margin concepts

Why do we use or need margins?

To provide a qualitative understanding of a margin recipe

To provide an overview of assumptions being made in the derivations of the van Herk

margin recipe

To discuss applicability of “conventional” margin concepts in hypo-fractionated / single fraction

SBRT

To discuss the effect of a limited number of fractions on random error

Explain why a random error for hypofractionated treatments results in a systematic

error

Explain how to calculate margins for single fraction and hypofractionated treatment

and provide some practical examples

How to add errors?

To discuss margins for tumors that move with respiration

To give suggestions for further reading