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Table 3 Mean perirectal distances (mm) on the T2-weighted MRI before (A, n = 13), and after SpaceOAR hydrogel (B, n = 18 patients). Mean change (Δ) in perirectal distances (C, n = 13)

From: A novel model to correlate hydrogel spacer placement, perirectal space creation, and rectum dosimetry in prostate stereotactic body radiotherapy

  Left Midline Right
2 cm 1 cm 0 1 cm 2 cm
A Superior (base) + 2 cm 12 9.1 11.7 10 14.3
+ 1 cm 12.8 8.2 5.8 6.8 10.8
Midgland 0 8.3 3 1 2.5 6.5
Inferior (apex) −1 cm 6.5 1.8 0.6 2 7.6
−2 cm   3 1.5 5  
B Superior (base) + 2 cm 15 13.6 14.6 12.2 16.2
+ 1 cm 13.7 11.8 10.9 10.9 12
Midgland 0 7.4 9.7 10.3 9.6 7
Inferior (apex) −1 cm 7 8.7 10.3 9.2 10.6
−2 cm   8.1 7.3 6.8  
C Superior (base) + 2 cm 0.5 3.5 4.8 4.6 2
+ 1 cm 0 3.6 5.5 5.3 1
Midgland 0 0 7.6 10 8.1 2.3
Inferior (apex) −1 cm 0 7.9 9.8 8.8 1.3
−2 cm   5.2 5.9 4.5