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.