The document discusses advances in radiation therapy for lung cancer including intensity modulated radiotherapy (IMRT), image-guided radiotherapy (IGRT), and stereotactic radiotherapy (SRT). IGRT uses daily imaging to precisely target tumors and reduces margins needed around tumors. SRT delivers very high radiation doses in one to five fractions directly to tumors, achieving high local control rates for stage I lung cancer. Tomotherapy is highlighted as it provides IGRT capabilities and can perform SRT without needing fiducial markers for targeting.