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Table 2 Mean perirectal distances (mm) measured on the CT simulation scan (n = 20). Standard deviation immediately beneath corresponding perirectal distance. The mean perirectal distance and standard deviation at each of 5 axial slices (right) and 5 sagittal slices (bottom) are also reported

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

  Left Midline Right Mean Stdev
2 cm 1 cm 0 1 cm 2 cm   
Superior (base) + 2 cm 14.4 12.5 14.5 13.8 18.1 14.7 10.3
6 8.2 11.1 9.6 16.9   
+ 1 cm 19.1 11 9.9 11.3 13 12.9 7.5
11.2 7.5 5.8 5.9 10.7   
Midgland 0 11.9 9 9.1 10.5 11.9 10.5 5.3
4 5.3 4.3 5.5 12.2   
Inferior (apex) −1 cm 8.7 8.2 8.5 8.2 9.4 8.6 5.6
2.6 5.9 5.1 6.8 2.2   
−2 cm   7.6 5.5 6.1   6.4 4.5
  4.3 4.2 4.4    
  Mean 13.5 9.7 9.5 10 13.1 10.1 7.4
  Stdev 7.7 6.4 6.9 6.9 12.5