Effect of Hydrogel Rectal Spacer on Intrafraction Prostate Motion During Radiotherapy of Prostate Cancer Patients

The use of hydrogel rectal spacer can mitigate intrafraction prostate motion in posterior and inferior directions, suggesting a potential dosimetric advantage with the use of hydrogel rectal spacer. However, longer follow-up may be needed to confirm whether this translates into significant clinical benefit outweighing potential risk.