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Table 4 Coefficient of determination (R2) values from simple linear regression models of rectum maximum 1, 2, and 3 cc point doses (rDmax 1, 2, 3 cc) and rectum volume receiving dose (rV95, 90, 80%) regressed against perirectal distance measurements obtained on CT (A) and hydrogel parameters (B)

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

  rDmax rV
1 cc 2 cc 3 cc 95% 90% 80%
A Perirectal Distance Measurement
 CTV center 0.44 0.45 0.42 0.6 0.55 0.27
 1 cm inferomedial to CTV center 0.41 0.37 0.31 0.5 0.38 0.15
 2 cm inferomedial to CTV center 0.39 0.35 0.28 0.49 0.33 0.1
B Hydrogel Parameters
 Hydrogel volume (cc) 0.23 0.22 0.18 0.2 0.14 0.04
 θ 0.36 0.33 0.26 0.43 0.34 0.14
 Normalized θ*gel volume 0.64 0.62 0.55 0.60 0.52 0.25