Comparison of survival between stereotactic body radiotherapy (SBRT) and video-assisted thoracic surgery (VATS) in patients aged ≥75 years. (a) Overall survival. (b) Progression-free survival. (c) Locoregional-recurrence free survival. (d) Distant-metastasis free survival.

Dose distribution for different regions (a) CatPhan CT-RED curve and (b) CIRS CT-RED curve and the DVH results from evaluation for different regions where the solid lines represent the measured dose, and the dotted lines represent the calculated dose (c) CatPhan CT-RED curve and (d) CIRS CT-RED curve

Stereotactic Radiosurgery (SRS) and Stereotactic Body Radiation Therapy (SBRT) have been increasingly utilized in Radiation Oncology to treat early stage tumors, metastatic targets, and retreatment of relapsed diseases due to its efficiency, treatment effect and cost effectiveness in the past two decades. SRS and SBRT both demand high specifications for their delivery machines as they deliver radiation doses with fewer treatment fractions and higher doses per fraction. Manufacturers have either invented specialized technologies solely or customized their existing machines for this purpose. In this paper, we review the major technologies and treatment machines for SRS and SBRT, describe their main features, and discuss the advantages and disadvantages.