. The American journal of roentgenology, radium therapy and nuclear medicine . unit skin dose() there will remain an intensityof rays of 65 to 70 per cent of the a depth of 2j^ to 3 cm. The intensitiesof rays at the adjoining sides of 2 fieldsof entrance are Increased by a summa-tion of the lateral Intensities of the 2fields to which eventually must be added athird field, the vulvar field. Therefore, it Isalmost Impossible to avoid raying someparts of the anterior wall of the laladder bya quantity of rays which approximates 150 to 160 per cent of If, duringradiation, the
. The American journal of roentgenology, radium therapy and nuclear medicine . unit skin dose() there will remain an intensityof rays of 65 to 70 per cent of the a depth of 2j^ to 3 cm. The intensitiesof rays at the adjoining sides of 2 fieldsof entrance are Increased by a summa-tion of the lateral Intensities of the 2fields to which eventually must be added athird field, the vulvar field. Therefore, it Isalmost Impossible to avoid raying someparts of the anterior wall of the laladder bya quantity of rays which approximates 150 to 160 per cent of If, duringradiation, the bladder is not emptied atleast every hour, the fundus vesicae, orrather the anterior wall of the bladder, willbe forced closer to the anterior abdominalwall, and thereby nearer to the roentgentube. The quantity of rays striking theanterior wall of the bladder will then bestill further Increased. In the latter in-stance an injury will occur, manifestingitself principally in blistering and an edemaof the vesical wall. A real burn and theformation of an ulcer in the mucosa of. 1 Fig. I. Location of fields on supia[jul jiu rciriull. the bladder may also take place. As themuscles bear a stronger dose than themucous membrane, only the epithelialcoat of the bladder will be injured. The rectal mucous membrane is alsosubject to similar injurious factors. Theanterior wall lies close to the portio, andall the cones of rays are focused on it. Ifthe radiation Is carried out carefully, theanterior rectal wall will not be , the posterior wall of the rectumlies within reach of at least 3 fields ofentrance. In thin patients, the region ofthe posterior rectal wall may be exposed toa radiation dose of about 140 to 150 percent of the Experience teaches that this overdosingwill occur only In small Isolated areas of themucosa, and ulcers will form. But it is alsopossible that ulcers may secondarily resultfrom vascular injuries and, eventually. 14^ In|uries ironi Roentgen Ray
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