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Interplay - Dynamic IMRT
→
If motion mitigation is not
applied during IMRT to a
moving target
CTV under/over-dosage
→
Delivery time comparable to
breathing period
→
Segment size comparable to
breathing amplitude
•
Fractionation
1fx
→
20% dose variation
30fx
→
<2% dose variation
Bortfeld PMB (47) 2002 - Jiang PMB (48) 2003 - …
•
Multiple fields
→
statistical averaging over
the beam reduces the overall dose error
•
Avoid low MU segments (few s delivery)
Seco et al. Med Phys(34) 2007
Bortfeld PMB (47) 2002