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Table 3 Position changes of parotid gland during intensity modulated radiotherapy

From: Rules of parotid gland dose variations and shift during intensity modulated radiation therapy for nasopharyngeal carcinoma

 

The first 15 fractions

Between fraction 15 and 25

 

SCT1 vs. SCT2

SCT2 vs. SCT3

 

Mean ± SD

95%CI

p Value

Mean ± SD

95%CI

p Value

Positional changes (mm)

      

All-PG

      

DLM

2.65 ± 2.12

2.21; 3.09

0.000

1.77 ± 1.96

1.37; 2.11

0.000

DMM

−1.25 ± 4.21

−2.12; −0.39

0.005

−0.56 ± 3.29

−1.24; 0.11

0.100

Con-PG

      

DLM

0.47 ± 1.07

0.09; 0.85

0.016

1.98 ± 1.83

1.33; 2.63

0.000

DMM

−0.53 ± 2.80

−1.52; 0.46

0.281

−2.49 ± 3.22

−3.63; −1.35

0.000

IP-PG

      

DLM

3.38 ± 1.53

3.44; 4.23

0.000

1.65 ± 2.04

1.13; 2.17

0.000

DMM

0.80 ± 2.96

0.047; 1.56

0.038

−2.19 ± 3.96

−3.21; −1.18

0.000

  1. Abbreviations: DLM the distance between the lateral aspects of PG and midline, DMM the distance between the medial aspects of PG and midline, The other abbreviations are the same as those in the Table 2.
  2. The positive and negative value for position changes means shift inside and outside, respectively.
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Radiation Oncology

ISSN: 1748-717X

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