SBRT2015

Analyze the separate steps

• Identify failure modes in process • 3 factors associated with each mode: ! Probability : " Likelihood of occurrence "

Event happening to 1% of patients (score 1), all (score 10)

! Detectability : "

How likely are we to catch the event?

" Easy catch (score 1), almost impossible to detect (score 10) ! Severity : " What is the consequence if it reaches the patient? " Causes discomfort or inconvenience (score 1), dose difference > 20%, injury or death (score 10). • Calculate Risk Probability Number (RPN)

33

SBRT 2015 - D. Verellen