SGRT (surface guided) and Deep Inspiration Breath Hold are more compatible with breast or lung cancers. The surface does not show how full the bladder is. Adaptive RT is for specific well-defined tumors.

That leaves IMRT which should always include IGRT (image guided). That is what is typically used for salvage radiation. The other option not mentioned is SBRT which has higher doses and fewer treatments. This would be novel for salvage treatment but is gaining more traction for primary treatment especially for intermediate cases and is the primary treatment to zap a few metastases. Proton could also be used rather than photon to have like treatments replacing either IMRT or SBRT.