IMRT

Volume changes during RT imaged by IGRT to assess normal tissue effects

• Volume variation of parotids and other organs during IMRT for HN cancer

PG: parotid glands SMG: submandibular glands TG: thyroid gland

CM: constrictor muscles SCM:sternocleidomastoid muscles MM: masticatory muscles L: larynx i=ipsi, c=contro

Courtesy C. Fiorino

Ricchetti et al. IJROBP 2011