42 CFR §512.240
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The modalities included in the RO Model are 3-dimensional conformal RT (3DCRT), intensity-modulated RT (IMRT), stereotactic radiosurgery (SRS), stereotactic body RT (SBRT), proton beam therapy (PBT), and image-guided radiation therapy (IGRT).