Hybrid Tomo‐Helical and Tomo‐Direct radiotherapy for localized prostate cancer

Purpose The aim of the study is to present a new planning approach to provide better planning target volume (PTV) coverage and reduce bladder and rectum dose with hybrid Tomo‐Helical (TH)/Tomo‐Direct (TD) radiotherapy (RT) for localized prostate cancer (LPC). Methods Twenty‐five LPC patients were included in this retrospective study. TH plans, TD plans, and hybrid TH/TD plans were created. Lateral beams were used for the hybrid TD plan and the prescribed dose was 70 Gy in 28 fractions (hybrid plans were combined 45 Gy/ 18 fxs for TH and 25 Gy/10 fxs for TD). Doses of PTV (D2%, D98%, D50%, homogeneity index (HI), conformity index (CI), coverage) and organs at risk (OARs) (V50%, V35%, V25%, V5%, and V95%) were analyzed. The Wilcoxon signed‐rank test was used to analyze the difference in dosimetric parameters. p‐Value