The Optimal Choice of Technique for Stereotactic Radiosurgery—A LINAC-Based Dosimetric Study between DCA, DCA-SSO, DCA-SSO-VDR, and VMAT

Abstract Introduction Advanced radiation therapy delivery techniques require greater understanding of various planning sequences and methods. The aim this study is to determine a class solution that finds the best possible technique deliver for stereotactic radiosurgery between dynamic conformal arc (DCA) using options such as DCA, DCA + SSO (segment shape optimization), VDR (variable dose rate) noncoplanar beam arrangement volumetric modulated (VMAT) coplanar beams. Materials Methods In dosimetric study, 11 brain cases were retrospectively planned analyzed Paddick conformity index (CI), Radiation Therapy Oncology Group homogeneity (HI), gradient (GI), treatment time in terms monitor units (MU) normal (V12Gy). paired t-test was performed know statistical significance techniques. Results CI, GI, control dose, VMAT plan superior other But, HI found be better with DCA. Above all, delivered higher MU than any technique. p-values SSO, are follows: CI: 0.0004, 0.015, 0.03; GI: 0.03, 0.33, 0.29; HI: 0.008, 0.04, 0.06; V12 Gy brain: 0.1, 0.01, 0.38. requires approximately 41 ± 17% more VDR. Conclusion beams preferable among all techniques, considering parameters studied. If not available facility, non can used SRS treatment.