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Taxonomies and Severity Scales
Incident Learning Systems» SAFRON and AAPM »
Taxonomy Review
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