GONADAL PROTECTION FROM X-RAY BEAMS IN RADIOGRAPHY OF HIP JOINTS FOR THE INFANTS

It is the purpose of this work to reduce the gonad dose to the population. the procedure of the gonadal protection should be devised hibitualy in the radiography of the hip joint, especially in the case of the congenital luxation for infant. The methods of the gonadal protection consist of the three points. 1) A new roentgenographic table made by the authors could easily get the well positioning for hip joint roentgenography. One could get easily the accurate positioning of the protector. 3) A Roughly triangular lead shield (lead equivalent 2.0mm) was made for placing the patient's pelvis in the supine position, and it completely shelded the female gonad from the direct irradiation (Fig. 10). A method of protection of the male gonads was to wrap up the gonad with lead rubber tube (Fig. 12). The good hip joint roentgenography were obtained by these devices. By this method, the gonad dose was reduced less than 1/10 in male and 1/15 in femal as compared with non-protecting lead divices. 3) The authors studied about proper selection of an intensifying screen, a multi-leaf diaphrogm, an adequate tube valtage, a highly sensitivity film, a grid, so as to reduce the exporsure dose.