Figure 1.

Conventional setting of deep regional hyperthermia for the pelvic region using the 8 MHz radiofrequency capacitive heating device. (a) Regular bolus, which attaches to electrodes of 30 cm in diameter, and overlay bolus (OB), in which internal cooled fluid circulates and cools the skin surface broadly. (b) Schematic diagram of deep regional hyperthermia using this device in the current conventional setting. RB, regular bolus; OB, overlay bolus. (c) Computed tomography (CT) image with the OBs in the prone position as in the heating position. (d) CT image after the segmentation of each organ. IGC, intergluteal cleft, SF, subcutaneous fat.