Fig 5.From: Hydrogel spacer shrinkage during external-beam radiation therapy following low-dose-rate brachytherapy for high-risk prostate cancer: a case series Effect of hydrogel spacer on external-beam radiation therapy (EBRT); comparison of irradiated rectal volume between treatment planning and during EBRT. Rectum VX is defined as the rectal volume receiving at least X% of the prescribed dose of EBRT. The rectum V60–80 during EBRT were significantly higher than at treatment planningBack to article page