Introduction
Methods
CT Simulation
Planning
Results
TomoHelical | TomoDirect | |||||
---|---|---|---|---|---|---|
Angles A ( p-value ) | Angles B ( p-value ) | |||||
(Mean ± standard deviation) | ||||||
Patient number | 19 | |||||
PTV* (cc) | 95.4 ± 22 | |||||
Modulation factor | 2 | |||||
Pitch | 0.215 | |||||
Field width | 2.5 | |||||
Conformity index | 1.95 ± 0.27 | 2.08 ± 0.37 | (0.22) | 2.01 ± 0.5 | ( 0.61) | |
Uniformity index | 1.06 ± 0.04 | 1.07 ± 0.05 | (0.26) | 1.06 ± 0.04 | (0.4) | |
D95% (%) | 96 ± 3 | 96 ± 3 | (0.99) | 96 ± 2 | (0.64) | |
Time (sec) | 202 ± 15 | 221 ± 19 |
(
0.001
)
| 215 ± 23 |
(0.04)
| |
Rectum | V10 Gy (%) | 99 ± 2 | 99 ± 2 | (0.51) | 98 ± 3 | (0.32) |
V20 Gy (%) | 78 ± 15 | 87 ± 11 |
(0.035)
| 81 ± 12 |
(0.49)
| |
V30 Gy (%) | 50 ± 4 | 65 ± 22 |
(0.005)
| 60 ± 19 |
(0.03)
| |
V40 Gy (%) | 30 ± 4 | 46 ± 24 |
(0.008)
| 42 ± 21 |
(0.01)
| |
V50 Gy (%) | 21 ± 3 | 33 ± 18 |
(0.008)
| 34 ± 19 |
(0.01)
| |
V60 Gy (%) | 15 ± 2 | 22 ± 12 |
(0.006)
| 25 ± 16 |
(0.01)
| |
V70 Gy (%) | 7 ± 2 | 10 ± 5 |
(0.01)
| 14 ± 12 |
(0.02)
| |
Bladder | V10 Gy (%) | 79 ± 18 | 76 ± 17 | (0.62) | 80 ± 17 | (0.81) |
V20 Gy (%) | 66 ± 18 | 61 ± 16 | (0.39) | 63 ± 19 | (0.76) | |
V30 Gy (%) | 51 ± 14 | 50 ± 13 | (0.89) | 51 ± 14 | (0.81) | |
V40 Gy (%) | 35 ± 9 | 37 ± 10 | (0.5) | 38 ± 9 | (0.44) | |
V50 Gy (%) | 24 ± 6 | 27 ± 8 | (0.23) | 28 ± 7 | (0.07) | |
V60 Gy (%) | 16 ± 4 | 19 ± 5 | (0.1) | 20 ± 5 |
(0.01)
| |
V70 Gy (%) | 9 ± 2 | 10 ± 3 | (0.28) | 12 ± 3 |
(0.004)
|
TomoHelical | TomoDirect | p- value | ||
---|---|---|---|---|
(Mean ± standard deviation) | ||||
Patient number | 9 (Tangential: 6, 3 ports: 3) | |||
PTV* (cc) | 365 ± 319 | |||
Modulation factor | 1.8 - 2.0 | |||
Pitch | 0.25 - 0.287 | |||
Field width | 2.5 - 5.02 | |||
Conformity index | 2.21 ± 0.14 | 4.63 ± 0.61 |
0.004
| |
Uniformity index | 1.07 ± 0.04 | 1.06 ± 0.02 | 0.93 | |
D95% | 96 ± 1 | 97 ± 1 |
0.04
| |
Time (sec) | 259 ± 39 | 271 ± 34 | 0.72 | |
Lung | MLD†(Gy) | 6 ± 1 | 3 ± 1 |
0.05
|
V5 Gy (%) | 44 ± 8 | 19 ± 6 |
0.02
| |
V10 Gy (%) | 22 ± 5 | 12 ± 4 | 0.38 | |
V20 Gy (%) | 6 ± 1 | 6 ± 2 | 0.85 | |
V30 Gy (%) | 2 ± 1 | 3 ± 1 | 0.65 | |
Cord (maximum dose) | 12 ± 3 | 7 ± 8 | 0.11 |
Tomohelical | Tomodirect | p-value | ||
---|---|---|---|---|
(Mean ± standard deviation) | ||||
Patient number | 18 | |||
PTV* (cc) | 289 ± 327 | |||
Modulation factor | 1.8 - 2.2 | |||
Pitch | 0.172 - 0.43 | |||
Field width | 2.5 - 5.02 | |||
Conformity index | 2.33 ± 0.13 | 3.24 ± 0.30 |
0.009
| |
Uniformity index | 1.08 ± 0.01 | 1.06 ± 0 01 | 0.61 | |
D95% (%) | 95± 1 | 96 ± 1 | 0.23 | |
Time (sec) | 217 ± 16 | 235 ± 21 | 0.3 | |
Lung | MLD† (Gy) | 10 ± 1 | 11 ± 1 | 0.68 |
V5 Gy (%) | 43 ± 3 | 30 ± 3 |
0.005
| |
V10 Gy (%) | 29 ± 2 | 23 ± 2 | 0.1 | |
V20 Gy (%) | 16 ± 2 | 18 ± 2 | 0.55 | |
V30 Gy (%) | 10 ± 1 | 13 ± 2 | 0.15 | |
V40 Gy (%) | 7 ± 1 | 8 ± 1 | 0.25 | |
V50 Gy (%) | 4 ± 1 | 6 ± 1 | 0.14 | |
Cord (maximum dose) | 36 ± 3 | 38 ± 3 | 0.33 |