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Table 2 Prostate volumes in descending order as segmented on the treatment planning CT and on the MR images before radiotherapy (MRI baseline ), in the middle of the treatment (MRI mid ) and at the end of treatment (MRI end )

From: Change in prostate volume during extreme hypo-fractionation analysed with MRI

Pat # CT MRIbaseline MRImid MRIend
  Abs. vol. (cm3) Rel. vol. Abs. vol. (cm3) Abs. vol. (cm3) Rel. vol. Abs. vol. (cm3) Rel. vol.
1 35.3 1.579 22.4 26.7 1.191 27.2 1.217
2 44.5 1.369 32.5 38.6 1.187 34.9 1.074
3 33.8 0.999 33.9 39.0 1.151 33.1 0.976
4 47.8 1.105 43.3 47.5 1.098 46.2 1.067
5 45.8 1.054 43.4 48.9 1.126 48.7 1.122
6 64.8 1.455 44.5 53.3 1.198 44.1 0.991
7 71.6 1.597 44.8 49.8 1.112 46.6 1.040
8 43.5 0.906 48.0 48.7 1.015 48.0 1.000
9 79.4 1.648 48.2 55.5 1.152 54.4 1.129
10 73.0 1.511 48.4 48.9 1.011 50.1 1.037
11 59.4 1.102 53.9 60.8 1.128 55.2 1.023
12 57.0 1.037 54.9 65.3 1.189 64.4 1.172
13 --* --* 57.2 66.6 1.166 62.2 1.089
14 83.8 1.196 70.1 88.7 1.265 78.0 1.112
15 99.0 1.347 73.5 80.0 1.088 74.1 1.008
16 79.4 1.066 74.5 95.5 1.282 96.2 1.291
17 96.5 1.145 84.3 96.8 1.148 -- --
18 105.8 1.242 85.2 96.3 1.131 101.4 1.190
19 106.2 1.021 104.0 116.8 1.123 115.6 1.112
20 153.7 1.045 147.1 155.0 1.054 152.9 1.040
Mean 72.7 1.233 60.7 68.9 1.141 64.9 1.089
SD 30.4 0.232 28.7 31.3 0.070 31.9 0.084
p-value 0.0001 0.0004 --- <0.0001 <0.0001 0.0008 0.0002
  1. Relative volumes and p-values are in relation to MRIbaseline.
  2. *Prostate was not segmented on CT as the patient had a hip prosthesis.
  3. Missing data, MRI not performed.
  4. Paired t-test.