Background
Methods
Patient characteristics
Patient | Gender | TNM | Primarius: Localisation from anal verge | Lymph node localisation | Cranial PTV margin |
---|---|---|---|---|---|
1 | f | uT3 cN1b | 4–9 cm | fossa obturatoria r. | L5/S1 |
2 | m | uT3 uN1a | 5–10 cm | perirectal | L5 sup./post. |
3 | f | uT3 cN1b | 5–10 cm | fasica | L5 sup./post. |
4 | m | uT3 uN1a | 4–7 cm | perirectal | L5 sup./ventral |
5 | m | uT3 uN2a | 5–11 cm | fasica | L5/S1 |
6 | m | uT3 uN1b | 6–10 cm | perirectal | L5/S1 |
7 | m | uT2 uN2b | 9–12 cm | presacral, perirectal | L4 |
8 | m | cT3 cN2a | 6–10 cm | fasica | L4 sup./ventral |
9 | m | uT3 uN2a | 4–9 cm | perirectal | L5 sup./post. |
10 | f | uT3 cN1a | 5–9 cm | perirectal | L5 sup./ventral |
Contouring
Treatment planning and evaluation
Results
Dosimetric analysis
Structure | Parameter | PTV0 | PTV-1 | p-value | PTV-2 | p-value | PTV-3 | p-value |
---|---|---|---|---|---|---|---|---|
Dose (Gy) | ||||||||
Rectum | Median | 50.5 | 50.4 |
0.170
| 49.9 |
0.220
| 49.6 |
0.185
|
Max | 53.4 | 53.2 |
0.110
| 53.3 |
0.687
| 53.3 |
0.624
| |
Sigmoid colon | Median | 38.8 | 37.4 |
0.362
| 33.1 |
0.126
| 29.8 |
0.093
|
Max | 51.9 | 52.0 |
0.575
| 51.7 |
0.444
| 52.0 |
0.221
| |
Femoral head | Median | 23.4 | 23.6 |
0.646
| 23.9 |
0.241
| 23.8 |
0.646
|
Max | 37.9 | 38.2 |
0.441
| 38.8 |
0.203
| 38.6 |
0.114
| |
Bladder | Median | 28.0 | 27.8 |
0.153
| 27.0 |
0.110
|
25.7
|
0.013
|
Max | 52.5 | 52.5 |
0.575
| 52.7 |
0.314
| 52.7 |
0.221
| |
Bone | Median | 27.6 |
26.6
|
0.007
|
24.9
|
0.005
|
21.9
|
0.005
|
Max | 53.8 | 53.8 |
0.959
| 53.7 |
0.594
| 53.8 |
0.959
| |
Small bowel loops | Median | 2.7 |
1.1
|
0.005
|
0.6
|
0.005
|
0.4
|
0.005
|
Max | 45.5 | 45.5 |
0.508
| 42.8 |
0.441
| 41.1 |
0.445
| |
Peritoneal space | Median | 20.9 |
15.5
|
0.005
|
9.9
|
0.005
|
5.0
|
0.005
|
Max | 53.6 | 53.6 |
0.721
| 53.8 |
0.386
| 53.4 |
0.214
| |
65 cc | 50.9 | 50.4 |
0.475
|
48.5
|
0.083
|
46.1
|
0.007
| |
100 cc | 49.3 |
48.5
|
0.153
|
46.2
|
0.028
|
44.4
|
0.005
| |
180 cc | 46.2 |
44.2
|
0.038
|
42.8
|
0.009
|
41.6
|
0.005
| |
830 cc | 18.0 |
14.9
|
0.012
|
9.6
|
0.012
|
7.5
|
0.012
|
Structure | Parameter | PTV0 | PTV-1 | p-value | PTV-2 | p-value | PTV-3 | p-value |
---|---|---|---|---|---|---|---|---|
Volume (%) | ||||||||
Bone | V10 | 87 |
84
|
0.007
|
78
|
0.005
|
70
|
0.005
|
V20 | 69 |
66
|
0.005
|
62
|
0.005
|
55
|
0.005
| |
V30 | 44 |
41
|
0.007
|
39
|
0.005
|
33
|
0.005
| |
V40 | 29 |
27
|
0.017
|
24
|
0.007
|
20
|
0.005
| |
Darm loops | V10 | 21 |
18
|
0.008
|
14
|
0.008
|
10
|
0.008
|
V15 | 19 |
16
|
0.008
|
13
|
0.008
|
8
|
0.008
| |
V20 | 14 |
11
|
0.008
|
09
|
0.008
|
06
|
0.008
| |
V25 | 9 |
7
|
0.008
|
5
|
0.008
|
4
|
0.008
| |
V30 | 6 |
5
|
0.008
|
3
|
0.008
|
3
|
0.008
| |
V35 | 4 |
3
|
0.028
|
2
|
0.028
|
2
|
0.018
| |
V40 | 3 |
2
|
0.043
|
2
|
0.028
|
1
|
0.028
| |
V45 | 2 |
2
|
0.018
|
2
|
0.028
|
1
|
0.028
| |
V50 | 1 |
0
|
0.612
|
0
|
0.176
|
0
|
0.028
| |
Peritoneal space | V10 | 71 |
58
|
0.005
|
47
|
0.005
|
37
|
0.008
|
V15 | 61 |
51
|
0.005
|
42
|
0.005
|
33
|
0.005
| |
V20 | 48 |
42
|
0.005
|
34
|
0.005
|
28
|
0.005
| |
V25 | 36 |
32
|
0.005
|
27
|
0.005
|
22
|
0.005
| |
V30 | 27 |
24
|
0.005
|
21
|
0.005
|
18
|
0.005
| |
V35 | 22 |
20
|
0.005
|
17
|
0.005
|
15
|
0.005
| |
V40 | 18 |
17
|
0.005
|
15
|
0.005
|
13
|
0.005
| |
V45 | 16 |
15
|
0.005
|
13
|
0.005
|
12
|
0.005
| |
V50 | 08 |
07
|
0.114
|
06
|
0.005
|
06
|
0.005
|