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Table 2 Dose difference between D1 and D2 for the evaluated PTV margins

From: Dosimetric effects of adaptive prostate cancer radiotherapy in an MR-linac workflow

 

7 mm PTV margin [%]

5 mm PTV margin [%]

3 mm PTV margin [%]

CTV Dmin

p

−1.1 [−37.1 – 0.50]

0.72

−2.0 [−52.5 – 0.42]

0.23

−4.2 [−73.6 – 0.21]

<  0.01

PTV D95%

p

−2.8 [−36.4 – 0.06]

<  0.01

−2.9 [−39.2 – 0.09]

<  0.01

−3.1 [−42.4 – 0.07]

<  0.01

PTV D98%

p

−5.7 [−52.7 – −0.11]

<  0.01

−5.2 [−51.5 – −0.26]

<  0.01

−5.0 [−53.6 – −0.06]

<  0.01

Rectum D15%

p

−3.6 [−52.3 – 28.7]

0.10

−3.6 [−56.1 – 41.7]

0.16

−2.6 [−56.0 – 43.0]

0.23

Bladder Dmean

p

−12.6 [−32.2 – 13.5]

<  0.01

−11.8 [−32.1 – 17.1]

<  0.01

−10.2 [−32.7 – 26.7]

<  0.01

  1. The mean dose difference between D1 and D2 for CTV Dmin, PTV D95%, PTV D98%, rectum D15% and bladder Dmean. Values in square brackets represent the range of dose difference. Differences between D1 and D2 with PTV margin of 7 mm, 5 mm and 3 mm are shown. Negative numbers indicate a decrease in dose from D1 to D2. The p-value for each structure is displayed for all PTV margins