2016 Risk Course Book

Taxonomies and Severity Scales

Exercise 3: Severity Medical and dosimetric scores do not directly address the issue of geometric misses? How would you report a geometric miss?

Yes

No

Ignore geometric misses – they are too difficult to quantify Record the largest dose deviation in the PTV or Organ at Risk Only record if an OAR dose limit were exceeded Error in mm in the position of the field central ray with respect to patient anatomy Error in mm of any field edge Use a metric which combines dose and volume information such as EUD

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