[Total skin therapy with electron beams. I. Physical and geometric factors]

The study pf physical and geometrical factors influencing dose distribution is necessary in performing the Total Skin Electron Therapy. The authors examined some aspects. Photographic emulsions in humanoid phantom were used for dosimetry. The techniques uses 6 dual fields at 320 cm treatment distance, with a degrading lucite filter 100 x 200 x 0.6 cm3 at 20 cm from the patient. Absorbed dose and energy were determined according TG 30 and 21 AAPM. The position of degrading filter was recognized to be the main factor influencing dose rate, penetration depth and dose homogeneity.