Advanced Skills in Modern Radiotherapy 2018

Why Is Accuracy So Important?

• OAR delineation has significant impact on dose calculation and plan quality in dosimetry

• IMRT and VMAT are inverse planning techniques and as such are driven by volumes ➢ Target and OAR relationship

• Accurate imaging ensures: ➢

Decrease in interobserver variability

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DVH calculation

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Greater confidence in predicting toxicity

➢ “reduction in inter- and intra-observer variability and therefore unambiguous reporting of possible dose-volume effect relationships” (van der Water, 2009)