Journal of Okayama Medical Association
Published by Okayama Medical Association

Full-text articles are available 3 years after publication.


Nakagiri, Yoshitada
Yamada, Toshiharu
Sugita, Katsuhiko
Mikami, Yasutaka
Ohkawa, Yoshihiro
Inamura, Kenji
Oguri, Nobuhiro
Nagaya, Isao
Noriyasu, Toshiaki
Okazaki, Yoshio
Inoue, Nobuhiro
Togami, Izumi
Hiraki, Yoshio
102_217.pdf 1.96 MB
The declerator and bolus, which reduce radiant energy in electron beam radiotherapy, were investigated with respect to the interrelation between their quality of material, thickness and position, and the mean energy anf depth-dose rate curve pattern. The data obtained indicated that an acryl decelerator fitted to the tube aperture had the disadvantage of entailing bremsstrahlung x-ray intervention as well as increased depth dose. An elastomeric bolus placed on the phantom surface, however, resulted in an increase surface dose and minmal x-ray intervention. When radiation was performed with the phantom surface held apart from the bolus, a build-up phenomenon occurred on the phantom surface with a consequent diminution of surface dose. It was concluded that a bolus is more effective than a decelerator fitted to the tube aperture for attenuation of radiant energy. It is more advantageus to irradite with the bolus in contact with the skin in cases in which the target is localized in the superficial layer of the skin, and with the bolus apart from the skin in cases in which the target is situated deeper below the skin.