IMRT 2018

Modulation degree vs MUs

• Decrease dose to OARs = higher constraints (identical angles) • IMRT1: low weight on constraints to lung and heart • IMRT2: high weight on constraints to lung and heart

PTV

MLD IMRT1: 11.9 Gy MLD IMRT2: 9.7 Gy MHD IMRT1: 6.5 Gy MHD IMRT2: 5.8 Gy