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Historical vs ICRU vs SBRT
•
Historical (on the xx% isodose)
• High central dose is ok
• Maximal dose gradient outside PTV
• Plan optimization through variation of beam edge to PTV distance
•
ICRU
• Homogeneous dose in PTV; high dose
NOT
ok
•
SBRT
• High central dose is ok
• Maximal dose gradient outside PTV
• Plan optimization through use of objectives
• IMRT/VMAT/FFF etc possible