Table 1. Peak temperatures in the skin surface and muscle induced by microwave hyperthermia at two radio frequencies. Because a warm water bolus was placed on the thigh before treatment, the baseline skin temperature increased in the 434-MHz system. |
|
Baseline T
°C |
Peak T
°C |
Temperature rise
°C |
Time to peak T
min |
| 434-MHz system |
| Skin surface |
| Mean (SD) |
34.2 (1.4) * |
39.2 (.5) |
5.0 (1.5) * |
10.7 (1.6) |
| Range |
31.6-35.9 |
38.2-39.8 |
3.1-8.2 |
8.4-13. 7 |
| Muscle |
| Mean (SD) |
35.0 (1.3) |
43.7 (.8) ** |
8.9 (1.4) ** |
9.9 (1.4) ** |
| Range |
33.2-37.9 |
42.8-45.4 |
6.3-11.4 |
8.4-12.5 |
| 2450-MHz system |
| Skin surface |
| Mean (SD) |
32.3 (1.1) |
39.2 (.8) |
6.9 (1.5) |
15.9 (7.3) |
| Range |
30.8-33.9 |
38.0-40.6 |
4.1-8.3 |
4.8-30.2 |
| Muscle |
| Mean (SD) |
35.0 (.8) |
41.1 (1.3) |
6.1 (1.4) |
20.0 (7.5) |
| Range |
33.6-36.0 |
39.6-43.2 |
3.9-8.5 |
9.5-30.3 |
|
* and ** denote p < 0.05 and 0.01, respectively compared with 2450-MHz system. |
* and ** denote p < 0.05 and 0.01, respectively compared with 2450-MHz system. |
* and ** denote p < 0.05 and 0.01, respectively compared with 2450-MHz system. |
|