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Learning Objectives
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To give an overview of margin concepts
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Why do we use or need margins?
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To provide a qualitative understanding of a margin recipe
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To provide an overview of assumptions being made in the derivations of the van Herk
margin recipe
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To discuss applicability of “conventional” margin concepts in hypo-fractionated / single fraction
SBRT
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To discuss the effect of a limited number of fractions on random error
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Explain why a random error for hypofractionated treatments results in a systematic
error
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Explain how to calculate margins for single fraction and hypofractionated treatment
and provide some practical examples
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How to add errors?
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To discuss margins for tumors that move with respiration
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To give suggestions for further reading